AU2005202592A1 - Compounds, Methods and Pharmaceutical Compositions for Treating Cellular Damage, such as Neural or Cardiovascular Tissue Damage - Google Patents

Description

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT Name of Applicant: Address for Service: Invention Title: Guilford Pharmaceuticals Inc.

CULLEN CO.

Level 26 239 George Street Brisbane Qld 4000 Compounds, Methods and Pharmaceutical Compositions for Treating Cellular Damage, such as Neural or Cardiovascular Tissue Damage The following statement is a full description of this invention, including the best method of performing it, known to us:

O

O

COMPOUNDS. METHODS AND PHARMACEUTICAL COMPOSITIONS FOR TREATING CELLULAR DAMAGE. SUCH AS NEURAL OR CARDIOVASCULAR TISSUE DAMAGE in FIELD OF THE INVENTION The present invention relates to inhibitors of the nuclear enzyme poly(adenosine '-diphospho-ribose) C polymerase I"poly(ADP-ribose) polmerase" or "PARP". which is also referred to as ADPRT (NAD:protein S(ADP-ribosvl transferase (polymersing)). pADPRT (poly(ADP-ribosei transferase) and PARS (poly(ADP-ribose) Ssynthctase) and provides compounds and compositons contaimng the disclosed compounds. Moreover, the 0 present invention provides methods of using the disclosed PARP inhibitors to prevent and/or treat tissue damage resulting from cell damage or death due to necrosis or apoptosis: neural tissue damage resulting from. for example. ischemia and reperfusion injury such as cerebral ischemic stroke. head trauma or spinal cord injury: neurological disorders and neurodegenerative diseases, such as. for example. Parkinson's or AJzheimer's diseases and multiple sclerosis: to prevent or treat vascular stroke: to treat or prevent cardiovascular disorders.

such as. for example. myocardial infarction: to treat other conditions and/or disorders such as. for example, agerelated muscular degeneration. AIDS and other immune senescence diseases, arthritis, atheroslerosis, cachexia.

cancer. degenerative diseases of skeletal muscle involving replicative senescence, diabetes (such as diabetes mellitus). inflammatory bowel disorders (such as colitis and Crohn's disease). acute pancreatitis. mucositis.

hemorrhagic shock. splanchnic anery occlusion shock, multiple organ failure (such as involving any of the kidney, liver, renal. pulmonary. retinal. pancreatic and/or skeltal muscle systems), acute autoimmune thvroiditis.

muscular dystrophy. osicoanhritis. osteoporosis. chronic and acute pain (such as neuropathic pain), renal failure.

retinal ischemia. septic shock (such as endoioxic shock), local and/or remote endothelial cell dysfunction (such are recognized by endo-dependent rela.ant responses and up-regulation of adhesion molecules), inflammation and skin aging: to extend the lifespan and proliferative capacity of cells. such as. for example. as general mediators in hie generation of oxidants. proinflammnatory mediators and/or cytokines. and general mediators of leukoc'te infiltration. calcium ion overload. phospholipid peroxidaion. impaired nitric oxide metabolism and/or reduced ATP production: to alter gene expression of senescent cells: or to radiosensitize hypoxic tumor cells.

BACKGROUND OF THE INVENTION PARP (EC 2.4.2.30). also known as PARS (for poly(ADP-ribose) synthetase). or ADPRT (for NAD:protein (ADP-ribosyv) transferase (polymersing)), or pADPRT (for poly(ADP-ribose) transferase), is a major nuclear proicin of 116 kDa. It is present in almost all cukarvores. The cn-zme synthesizes O poly(ADP-ribose. a branched polymer that can consist of over 200 ADP-ribose units from NAD. The protein acceptors of poly(ADP-ribosec are directly or indirectly involved in maintainng DNA integrity. They include histones. topoisoncrases. DNA and RNA polymerases. DNA ligases. and Ca:- and Mg"--dependent endonucleases. PARP protein is expressed at a high level in many tissues, most notably in the immune system.

heart. brain and germ-line cells. Under normal physiological conditions, there is minimal PARP acivirv.

However. DNA damage causes an immediate activation of PARP by up to 500-fold. Among the many functions C] attributed to PARP is its major role in facilitating DNA repair by ADP-ribosvlation and therefore co-ordinating a number of DNA repair proteins. As a result of PARP activation. NAD levels significandy decline. While many endogenous and exogenous agents have been shown to damage DNA and activate PARP. peroxvnitrite. formed Sfrom a combination of nitric oxide (NO) and superoxide. appears to be a main perpetrator responsible for various Sreported disease condiuons in vivo. during shock and inflammation 0 Extensive PARP activation leads to severe depletion of NAD in cells suffering from massive DNA damage. The shon life of poly(ADP-ribose) half-life 1 mini results in a rapid turnover rate. Once polytADP-ribose is formed. i is quicky degraded by the :onstirutiveiy active poly(.ADP-ribosc) glycohvdrolase (PARG). together wthv phosphodiesteras and (ADP-nbosei protein lyase. PARP and PARG form a cycle that converts a large amount of NAD to ADP-nbose. In less than an hour. over-sumulation of PARP can cause a drop of NAD and ATP to less than 20% of the normal level. Such a scenario is especially detrimental during ischaemia when deprivation of oxygen has already drastically compromised cellular energy output. Subsequent free radical production during reperfusion is assumed to be a major cause of tissue damaee. Pan of the ATP drop. which is typical in many organs during ischaemia and reperfusion. could be linked to NAD depletion due to poly(ADP-ribosel turnover. Thus. PARP or PARG inhibition is expected to preserve the cellular energv level to poteniate the sun-ival of ischaemic tissues after insult.

Poly(ADP-nbosc) synthesis is also involved in the induced expression of a number of genes essential for inflammatory response. PARP inhibitors suppress production of inducible nitric oxide syndhase (iNOS) in macroplages. P-type selectin and intercellular adhesion molecule-I (IC.AM-1 in endothelial cells. Such actvint underlies the strong anti-inflammation effects exhibited by PARP inhibitors. PARP inhibition is able to reduce necrosis by preventing translocation and infiltration of neutrophils to the injured tissues. (Zhang. J. 'PARP inhibition: a novel approach to treat ischaemia/reperfusion and inflammation-related injuries". Chapter 10 in Emerine Drugs (1999) 4: 209-221 Ashley Publications Ltd.. and references cited therein.) PARP production is activated by damaged DNA fragments which, once activated. catalyzes the attachmen of up to 100 ADP-ribose units to a variety of nuclear proteins, including histones and PARP itself.

During major cellular stresses the extensive activation of PARP can rapidly lead to cell damage or death through depletion of energy stores. As four molecules of ATP are consuned for every molecule of NAD (the source of ADP-ribose and PARP substrate) regenerated. NAD is depleted by massive PARP activation and. in the efforts to re-synthesize NAD. ATP may also be depleted.

lt It has been reported that PARP activation plays a key role in both NMDA. and NO-induced 0 neurotoxicity. This las been demonstrated in corucal cultures and in hippocampal slices wherein prevention of l ltoxiciry is directly correlated to PARP inhibition potency (Zhang et al., "Nitric Oxide Activation of Poly(ADP- Ribose) Synthetase in Neurotoxicitv". Science. 263:687-89 (1994) and Wallis et al.. Neuroprotection Against Nitric Oxide Injury with Inhibitors of.ADP-Ribosvlation". NeuroRepon. 5:3. 245-8 (1993)). The potential role i of PARP inhibitors in treating neurodegenerauve diseases and head trauma has thus been recognized even if the exact mechanism of action has not yet been elucidated (Endres et al.. "Ischemic Brain Injury is Mediated by the Activation of Poly(ADP-Ribose)Polymerase". J. Cereb. Blood Flow Meabol.. 17:1143-51 (1997) and Wallis et "Traumatic Neuroprotection with Inhibitors of Nitric Oxide and ADP-Ribosylation. Brain Res.. 710:169-77 Cl 10 (1996)), 0 Similarly. it has been demonstrated that single injections of PARP inhibitors have reduced the infarct n size caused by ischemia and reperfusion of the heart or skeletal muscle in rabbits. In these studies, a single Sinjection 3-amino-benzamide (10 mg/kg). either one minute before occlusion or one minute before reperfusion.

C caused similar reductions in infarct size in the heart (32-42% while 1.5-dihydroxNisoquinoline (I mg/kg).

another PARP inhibitor, reduced infarci size by a comparable degree (38-48' Thiemermann et al. "Inhibition of the Activity of Poly(ADP Ribose) Synthetase Reduces Ischemia-Reperfusion injury in the Heart and Skeletal Muscle". Proc. Nail. Acad. Sci. USA. 94:679-83 (1997). These results make it reasonable to suspect that PARP inhibitors could salvage previously ischemic heart or skeletal muscle tissue.

PARP activation can also be used as a measure of damage following neurotoxic insults following overexposure to any of glutamate (via NMDA receptor sumulation). reactive oxygen intermediates. amyloid 0 protein. N-nethy!l--phenyl-1.2.3.6-tetrahydropyridine (MPTP) or Its active metabolite N-methll-4phenylpyridine (MPP". which participate in pathological conditions such as stroke. Alzheimer's disease and Parkinson's disease. Zhang et al.. "Poly(ADP-Ribosel Svynhetase Activation: An Early Indicator of Neurotoxic DNA Damage". J. Neurochem.. 65:3. 1411-14 (1995). Other studies have continued to explore the role of PARP activation in cerebellar granule cells in vitro and in MPTP neurotoxicity. Cosi et al.. "Polv(ADP-Ribose) Polymerase (PARP) Revisited. A New Role for an Old Enzyme: PARP Involvement in Neurodegeneration and PARP !nhibitors as Possible Neuroprotective Agents". Ann. N. Y. Acad. Sci.. 325:366-79 (1997): and Cosi et al.. "Poly(ADP-Ribose) Polymerase Inhibitors Protect Against MPTP-induced Depletions of Striatal Dopamine and Cortical Noradrenaline in C57B1/6 Mice". Brain Res.. 729:264-69 (19961. Excessive neural exposure to glutamatc. which serves as the predominate central nervous system neurotransmiter and acts upon the Nmethyl-D-aspanate (NMDA) receptors and other subtype receptors. most often occurs as a result of stroke or other neurodegenerative processes. Oxygen deprived neurons release glutamate in great quantities during ischemic brain insult such as during a stroke or heart attack. This excess release of glutamate in turn causes over-stimulation (excitotoxicity) of N-meihyl-D-aspanate (NMDA). AMPA. Kainate and MGR receptors. which open ion channels and permit uncontrolled ion flow Ca z and Na" into hie cells and K' out of the cells) leading to overstimulation of the neurons. The over-stimulated neurons secrete more glutamate. creating a feedback loop or domino effect which ultimately results in cell damage or death via the production of proteases.

O lipases and free radicals. Excessive activation of glutamate receptors has been implicated in various Sneurological diseases and conditions including epilepsy, stroke. Alzheimer's disease. Parkinson's disease.

Amyotrophic Lateral Sclerosis (ALS). Huntington's disease. schizophrenia. chronic pain. ischemia and neuronal loss following hypoxia. hypoglycemia. ischemia. trauma, and nervous insult. Glutamate exposure and t f stimulation has also been implicated as a basis for compulsive disorders, particularly drug dependence.

Evidence includes findings in many animal species. as well as in cerebral cortical cultures treated with glutamate or NMDA. that glutamate receptor antagonists compounds which block glutamate from binding to or Sactivating its receptor) block neural damage following vascular stroke. Dawson et al.. "Protection of the Brain from Ischemia". Cerebrovascular Disease. 319-25 Hunt Baijer ed.. 1997). Attempts to prevent excitotoxicity O by blocking NMDA. AMP.. Kainate and MGR receptors have proven difficult because each receptor has l, multiple sites to which elutamate may bind and hence finding an effective mix of antagonists or universal Santagonist to prevent binding of glutamate to all of the receptor and allow testing of this theory. has been C difficult. Moreover. many of the compositions that are effective in blocking the receptors are also toxic to animals. As such. there is presently no known effective treatment for glutamate abnormalities.

The stimulation of NMDA receptors by glutamate. for example, activates the enzyme neuronal nitric oxide synthase (nNOS). leading to the formauon of niinc oxide which also mediates neurotoxicirv.

NMDA neurotoxiciyr may be prevented by treatment with nitric oxide synthase (NOS) inhibitors or through targeted genetic disruption of nNOS in vitro. Dawson et al. "Nitric Oxide Mediates Glutamate Neurotoxicitv in Primary Conical Cultures". Proc. Natl. Acad. Sci. USA. 88:6368-71 (1991): and Dawson et al.. "Mechanisms of Nitric Oxide-mediated Neurotoxicitv in Primary Brain Cultures". J. Neurosci.. 13:6. 2651-61 (1993). Dawson et al.. "Resistance to Neurotosicirv in Cortical Culures from Neuronal Nitric Oxide Svnthase-Deficient Mice". J.

Neurosci.. 16:8. 2479-87 (1996). Iadecola. "Brieht and Dark Sides of Nitric Oxide in Ischemic Brain Injury".

Trends Neurosci.. 20:3. 132-39 (1997). Huang et al.. "Effects of Cerebral Ischemia in Mice Deficient in Neuronal Nitric Oxide Synthase". Science. 265:1883-85 (1991). Beckman et al.. "Pathological Implications of Nitric Oxide. Superoxide and Peroxnitrite Formation". Biochem. Soc. Trans.. 21:330-34 (1993). and Szab6 et al.. "DNA Strand Breakage. Activation of Poly(ADP-Ribose) Synthetase. and Cellular Energy Depletion are Involved in the Cvtotoxicity in Macrophages and Smooth Muscle Cells Exposed to Pero.xnitrite". Proc. Natl.

Acad. Sci. USA. 93:1753-58 (1996).

It is also known that PARP inhibitors, such as 3-amino benzamide. affect DNA repair generally in response, for example, to hydrogen peroxide or gamma-radiation. Crisiovao et al.. "Effect of a Polv(ADP- Ribose) Polymerase Inhibitor on DNA Breakage and Cyotoxiciry Induced by Hydrogen Peroxide and y- Radiation." Terato.. Carcino.. and Muta. 16:219-27 (1996). Specifically. Cnstovao et al. observed a PARPdependent recovery of DNA strand breaks in leukocytes treated with hydrogen peroxide.

t PARP inhibitors have been reported to be effective in radiosensitizing hypoxic tumor cells and effective O in preventing tumor cells from recovering from potenually lethal damage of DNA after radiation therapy.

presumably by their ability to prevent DNA repair. U.S. Patent Nos. 5.032.617: 5.215.738: and 5.041.653.

Evidence also exists that PAR? inhibitors arc useful for eating inflammatory bowel disorders. such as colitis. Salzman et al.. "Role of Peroxynirite and PolytADP-RiboseSynthase Activation Experimental Colitis." Japanese J. Pharm.. 75. Supp. [115 (1997). Specifically. Colitis was induced in rats by intraluminal administration of the hapten trinitrobenzene sulfonic acid in 50% ethanol. Treated rats received 3aminobenzamide. a specific inhibitor of PARP acti-ity Inhibition of PARP activity reduced the inflammatory 0c response and restored the morphology and the energetic status of the distal colon. See also. Southan et al..

1 l0 "Spontaneous Rearrangement of Aminoalkvlithioureas into Mercaptoalkvlguanidines. a Novel Class of Nitric O Oxide Synthase Inhibitors with.Selectivity Towards the Inducible Isoform". Br. J. Pharm.. 117:619-32 (1996); l, and Szabo et al.. "Mercaptoethvlguanidine and Guanidine Inhibitors of Nitric Oxide Svnthase React with SPeroxynitrite and Protect Against Pero.xnitrite-induced Oxidative Damage". J. Biol. Chem.. 272:9030-36 1 (1997).

Evidence also exists that PARP inhibitors are useful for treating arthritis. Szab6 et al.. "Protective Effects of an Inhibitor of Poly ADP-Ribose Svntherase in Collagen-Induced Arthrius." Japanese 1. Pharm.. Supp. 1:102 (1997); Szab6 et al.. "DNA Strand Breakage. Acuvation of Poly(ADP-Ribose)Synthetase. and Cellular Energy Depletion are Involved in tie Cytoroxicirt in Macrophages and Smooth Muscle Cells Exposed to Perox-nitrite." Proc. Nail. Acad. Sci. USA. 93:1r53-58 (March 1996): and Bauer ct al.. "Modification of Growth Related Enzymatic Pathways and Apparent Loss of Tumorigenicity of a ras-transformed Bovine Endothelial Cell Line by Treatment with 5-lodo-6-anuno-l.2-benzopyrone (INH2BP1". Intl. J. Oncol.. 8.239-52 (1996): and Hughes et al.. "Induction ofT Helper Cell Hyporesponsiveness in an Experimental Model of Autoimmunirt by Using Nonmitogenic Anti-CD3 Monoclonal Antibody". J. Immuno.. 153:3319-25 (1994).

Further. PARP inhibitors appear to be useful for treating diabetes. Heller et al.. "Inactivation of the Poly(ADP-Ribose)Polymerase Gene Affects Oxygen Radical and Nitric Oxide Toxicity in Islet Cells." J. Biol.

Chem.. 270:19. 11176-80 (May 1995). Heller et al. used cells from mice with inactvated PARP genes and found that these mutant cells did not show NAD" depletion after exposure to DNA-damaging radicals. The mutant cells were also found to be more resistant to the toxicity of NO.

PARP inhibitors have been shown to be useful for treating endocoxic shock or septic shock. Zingarelli et al.. "Protective Effects of Nicotinamide Against Nitric Oxide-Mediated Delayed Vascular Failure in Endoloxic Shock: Potential Involvement ofPolyADP Ribosyl Synthetase." Shock. 5:258-64 (1996). suggests that inhibition of the DNA repair cycle triggered by poly(ADP ribose) synrhetase has protective effects against vascular failure in endotoxic shock. Zingarelli et al. found that nicotinamide protects against delayed. NO-mediated vascular failure in endotoxic shock. Zingarelli et al. also found that the actions of nicotinamide may be related to inhibition of the NO-mediated activation of the energy-consuming DNA repair cycle. triggered by polv(ADP ribose) synthetase. Cuzzocrea. "Role of Pcroxynitnue and Activation of Pol(ADP.Ribose) Synthctasc in the O Vascular Failure induced by Zymosan-activated Plasma." Brit. J. Pharm.. 122:493-503 (1997).

Cl PARP inhibitors have been used to treat cancer. Suto et al.. "Dihydroisoquinolinones: The Design and Synthesis of a New Series of Potent Inhibitors of Poly(ADP-Ribose) Polymerase. Anticancer Drug Des.. 7:107- S 5 17 (1991). In addition. Suto et al. U.S. Patent No. 5.177.075. discusses several isoquinolines used for enhancing the lethal effects of ionizing radiation or chemotherapeutic agents on tumor cells. Weltin et al..

"Effect of 6(5H)-Phenanthridinone. an Inhibitor of Poly(ADP-ribose) Polymerase. on Cultured Tumor Cells".

CI Oncol. Res.. 6:9. 399-403 (1994). discusses the inhibition of PARP activity, reduced proliferation of tumor cells.

0^ and a marked synergistic effect when tumor cells are co-treated with an alky-laung drug.

Cl 10 Still another use for PARP inhibitors is the treatment of peripheral nerve injuries, and the resultant Cl pathological pain syndrome known as neuropathic pain. such as that induced by chronic constrction injury S(CCI) of the common sciatic nerve and in which transsynaplic alteration of spinal cord dorsal horn characterized Sby hyperchromatosis of cytoplasm and nucleoplasm (so-called "dark" neurons) occurs. Mao et al.. Pain. 72:355- C366(1997).

PARP inhibitors have also been used to extend the lifespan and proliferative c-pac:- of :el!h including treatment of diseases such as skin aging. Alzheimer's disease. atherosclerosis, osteoarthritis. osteoporosis.

muscular dystrophy. degenerative diseases of skeletal muscle involving replicative senescence. age-re!aied muscular degeneration. immune senescence. AIDS. and other immune senescence diseases: and to alter gene expression of senescent cells. WO 98/27975.

Large numbers of known PARP inhibitors have been described in Banasik et al.. "Spec:fic Inhibitors of Polv(ADP-Ribose) Synthetase and Mono(ADP-Ribosvll-Transferasc". J. Biol. Chem.. 267:3. 1569-75 (1992).

and in Banasik et al.. "Inhibitors and Activators of ADP-Ribosylation Reactions". Molec. Cell. Biochem..

138:185-97 (1994). However. effective use of these PARP inhibitors, in the ways discussed above. has been limited by the concurrent production of unwanted side-effects (Milam et al.. "Inhibitors of Polv(Adenosine Diphosphate-Ribosc) Synthesis: Effect on Other Metabolic Processes". Science. 223:589-91 (1984)).

There continues to be a need for effective and potent PARP inhibitors which produce minimal sideeffects. The present invention provides compounds. compositions for. and methods of. inhibiting PARP activity for treating and/or preventing cellular, tissue and/or organ damage resulting from cell damage or death due to, for example. necrosis or apoptosis. The compounds and compositions of the present invention are specifically useful in ameliorating. treating and/or preventing neural tissue or cell damage. including that following focal ischemia and reperfusion injury Generally. inhibition of PARP activity spares the cell from energy loss.

preventing irreversible depolarization of the neurons and. thus. provides neuroprotection. While not wishing to be bound by any mechanistic theory. the inhibition of PARP activity by use of the compounds. compositions and methods of the present invention is believed to protect cells, tissue and organs by protection against the ill-effects of reactive free radicals and nitric oxide. The present invention therefore also provides methods of treating and/or preventing cells. tissue and/or organs from reactive free radical and/or nitric oxide induced damage or mury.

SUMMARY OF THE INVENTION The present invention provides compunds which inhibit poly(ADP-ribose) polymerase (PARP").

compositions containing these compounds and methods for using these PARP inhibitors to treat, prevent and/or C ameliorate the effects of the conditions described herein.

In one embodiment, the present invention provides compounds of Formula 1:

OH

Z z N lb IY R? -(S0)NR 6

),T(W)V

X

R3 4 R1 R1 or a pharmaceutically acceptable salt. hydrate. prodrug. or mixtures thereof, wherein: m is zero or one: n is zero or one: p is one or two; Y is a direct bond. N. or Z is O. or S- X is NR, CR 1

:R

1 3 a bond. -CRi:=CRg3y. or -C(Rj2Rj3)C(RjRj W is selected from -CN. -C(Rg)h, where the RP substituents may be combined to form a heteroarvi or C3-C, cycloalkvl optionally containing at least one hetero atom in place of a carbon atom. OR. -P(O)(OR 2, -S(OhR., -S(OhNR 0 C3-C cycloalkvl optionally containing at least one heteroatom in place of a carbon atom and beteroaryl; R. Rk, Rs. 6 Rs, Ri:, R13. R 1 and R 15 when present are independently: hydrogen, lower

(C

1 straight or branched chain) alkvyl. C,-C@cycloalic optionally containing at least one heteroatom in place of a carbon atom. lower straight or branched chain) alkcnyl. C,-C cycloalkenyvl. lower (C 1 -C alko.xy.

aryl. heteroaryl. aralkvl. heteroaralkvl. alkaryl. alkheteroarvl. hydroxy. amino. nitro. halo. nitroso. sulfo. sulfonic acid. or carboxv: R is hydroeen. lower (C 1 straight or branched chain) alkl. C3-C cycloalkvl oprionally containing at least one hleteroatom in place of a carbon atom. lower straight or branched chain) alkenvi. aryl.

heteroarvi. aralkvl. hetcroaralkvl. alkarvl. alkheteroarl. hydroxy. lower (Ci-C) alcohol. lower (Ci-C) alkox.

amino. or carboxv: and and are independently: hydrogen. lower (Ci-C, straight or branched chain) alkv lower (C-C 9 straight or branched chain) alkenyl. arlv. aralkvt. alkarnl. halo. hydrox. lower alkoxv., amino. or carboxy: each R,,j is independentlh hydrogen or lower (C-C3 straight or branched chain) alkl: and T. when present. is a divalent or trivalent organic residue independently selected from the group S 10 consisting of lower (C:-Cs straight or branched chain) alkviene. lower alkenylene. arlene. aralkvlene. and alkarvilene: Swherein one. two or three of the hydrogen atoms of said divalent or trivalent organic residue can be substituted by a moiety selected from the group consisting of: lower straight or branched chain) alkvyl.

cycloalkvl. louer straight or brancd chd ain) alkenyl. cycloalkenyl. aMt. heteroarvl. aralkvl.

heteroarvakyi. alkarvi. alkheeroarYl. halo. trifluoromethyl. hydroxx. lower alkoxy. amino. nitro.

trifluoromethyl. alkcnylox.. phenoxy. and benzmlox: wherein one. two. or three carbon atoms in the divalent or trivalent organic residue can be replaced by a hetero-atom-containing-moier selected from the group consisting of: phenoxv. phenoxvmethyl.

phenoxvcarbonvl. benzvloxy. 5S. -NR 1 -SO:NR-. and wherein any of the lower straight or branched chain) alkvl. C 3 -Cj cycloalkvl optionallv containing at least one heteroatom in place of a carbon atom. lower (C:-Cu straight or branched chain) alkenyl.

aryl. heteroarvl. aralkvl. and alkaryl groups can be independently substituted with one. two or three subsiuens selected from the group consisting of: lower (C-C straight or branched chain) alkvl. C-C, cvcloalkvl optionally containine at least one heteroatom in place of a carbon atom. tower straight or branched chain) alkenvl.

cycloalkenyl. aryl. heteroarnl. araikvl. heteroaralkvt. alkarvl. alkhereroarvl. halo. trifluoromethvl. hvdro.xv.

lower (Ck-C) alko. carboxy (such as methoxv or ethoxv). carbonvl. lower ailki ester (such as methriester or ethylester). amino. nitro. trifluoromethyl. alkenvlo. phenoxy. benzvloxy.

wherein one. two. or three carbon atoms of any of the lower straight or branched chain) alkvyl.

CC, cycloalkyl optionally containing at least one hereroatom in place of a carbon atom, lower straight or branched chain) alkenyl. arl. heteroarvl. aralkvl. and alkaryl groups can be replaced by a hctero-atomcontaining-maiery selected from the group consisting of: -NRISO:-. N. -NR,and The dotted line between positions I and 2 in chemical formulas herein will be recognized to represent a single or double bond.

In another embodiment, the present invention provides compounds of Formula (II) H00 z N Y

R-

RY R tN(Rj)4Mq(C(0j3Rg In x Rx RR c or a pharmaceutically acceptable salt. hydrate. prodrug. or mixtures thereof, wherein: O q is zero or one- CiY is N. -CH- or -CH:.

Z is O: tr X is or a bond: R. R. and R- when present. are independently: hydrogen. lower (C,-C 9 straight or branched chain) alkvl. lower straight or branched chain) alkenyl. C,-Ct cvloalkvl optionally containing at least one heteroatom in place of a carbon atom. C 5 cycloalkeny. lower (Ct-C 4 alkoxv. arl. heteroar!.

aralkvl. heteroaralkYl. alkazyl. alkheteroarly. hydroxy. amino. nitro. halo. nitroso. or carboxy R, is hydrogen. lower straight or branched chain) alkyl. C-C, cycloalkyl optionally containing at least one heteroatom in place of a carbon atom. lower straight or branched chain; alkenyL aryl.

heteroarl. aralkl. heteroaralkvl. alkarl. alkheteroarl. hvdrox-'. lower alcohol. lower (C alkoxy.

amino. or carbosy: and T. when present. is a divalent or trivalent organic radical independently selected from the group consisting of: lower alkvlene. lower alkenylene. C-C 4 alkenylox. arcylene. aralkylene. and alkarylene; wherein one. two or three of the hydrogen atoms of said di'alenr or Ervalent organic radical can be substituted by a moiety selected from the group consisting of: lower 1C,-C. straight or branched chain) alkvl.

lower straight or branched chain) alkenyl. aryl. aralk. alkaryl. halo. trifluoromerthyl. hvdroxy. lower alkaxy. amino. nitro. trifluoromethyL alkenyloxy. phenoxy. and benzvloxy: wherein one, two. or three carbon atoms in the divaleni or trimvalent organic radical can be replaced by a hetero-axom-containing-moiety selected from the group consisting of phenoxy. phenoxycarbonyl. benzvloxy. -0- -NR, SOZ-. -SO and -PO-r; wherein the lower allcyl. cyloalkyl optionally containing at least one heteroaom. lower (C--Co straight or branched chain) alkenyl. aryl. heteroaryl. arnilcL heteroaralky. alkaryl, and alkheteroaryl groups can be independently substituted with one. two or three substiruents selected from the group consisting of: lower straight or branched chain) alkl. C 3 cycolalky optionally containing at least one heeratom.

lower (C:-C 9 straight or branched chain) alkenyl. aryl. heteroaryl. aralkvl. heteroaralkyl. alkaryl. alkheteroaryl.

halo. trifluoromehyl. hvdro.v, lower (C;-C 4 alko.y. carboxy (such as methoxv or ethoxv). carbonyl. lower alkvl ester isuch as rnethylester or ethylester). amino. nWro. tuifluoromethyl. alkenyloxv. pbeno, benzyloxv.

Cl wherein one. two. or three carbon atomns thereof can be replaced by, a hezew-atotn-conriningmoiew selected from the group consisting of: _NRI SO:-.-SO4-NTh.. N. -Nfl. and -P0-.

In a further embodiment -the present invention provides compounds of Formula (III) ClH 0 -5 0 2 ((NR 17

,(N(R

18

R,

9 wherein Z and Xare oxxgert: q is zero or one: "alk," is lower alkvlenc: R, vand R,,9 are independently hydrogen or lower alkyl: or and R 1 or R 13 and R 1 taken together can be a lower alkcylene to form a heterocyclic ring: and R, and R- are independently: hydrogen. lower (C I-C 9 straight or branched chain) aiy. C,-Cl cycloalkvl optionally containing ax least one herero atom. lower (C;-C 9 straight or branched chain) alkenvi. lower (C 1

-C

4 alkoxv. an]I. heteroarvi. aralkvi. hezeroaxalkvl. alkarvl. aldiereroanli. bydroxv%%. ammno.

n~itro. halo. nitroso. or carboxvy.

In yet a futrther embodiment the present invention provides compounds of Formulas (rV) and (V 10 0

R,

W R (Z R wherein R-R, are as defined above. Preferably. are each independentldy an% of hydrogen, methyl.

ethyl. propyl. isopropyl. butyt. isoburyi. hydroxyl. armuno. nitro. mtroso. carboxv. trifluoromethyl. phenoxv. and 5 benz ioxr Preferred embodiments of the present invenuon include compounds wherein X and Z are oxygen and Y is nitrogen. Tle preferred forms of the follouing specific embodiments include. but are not limited to.

compounds wherein X and Z are oxygen and Y is nitrogen.

Preferred embodiments of the present invention include compounds wherein each of W is -CN. m and n are zero and p is one. Of these. further preferred embodiments include compounds where T is Z and X are oxygen. Y is N and R, to R- are hydrogen. Preferably. each of T is -CHI-. Z and X are oxygen and Y is N Further preferred embodiments of the present invention include compounds where each of W is preferably W is -N0P)- m and n are zero and p is one. X is preferably oxygen or a bond. 2 is oxygen and Y is nitrogen. Of these. preferred embodiments include those compounds where each R9 is independently selected from hydrogen. methyl. ethyl. propyl, isopropyl. bul. isoburvy. penvl, isopenwyl. methoxy. etho.x or amino or where the R9 substituents combine with the N to form a 5- or 6- membered substituted or unsubstituted heteroeycloalkl. optionally subsituted ith an additional oxygen or nitrogen or combine aith the N to form a or 6- membered substituted or unsubstituted heteroaryl. Tie substitutions of these preferred embodiments preferably including methyl. ethyl. propyl. isopropyl. buryl. isoburyL methylester. ethylester, benzyi phenyl.

benzox, phenox., phenoxcarbonyl. one or twnvo additional heterocycloalkis or hetereoary rings and/or one or two fused benzene rings. Preferred forms of this embodiment include compounds where T is absent. -CH- or CH:-CH:- CH:S. CH-SCH_. CHISCH:CH:. methoa.y or pheno.\methyl. Particularly preferred forms of this C] rfrbyWi n r eoadp soe speeal xgno od sove 11 embodiment include compounds wherein R. substituents combine. with the N of W. to form a

N

N N -N SN group, which may be optionally substitutd by the above-noted substitutions, such as. for example.

tl pyridyl. benzvl. phenyl methyl ester or ethyl ester, and/or fused with 1-2 additional benzene nngs.

In a further preferred embodiment of the present invention, each of W is m is one and n is one.

C" X is oxygen or a bond. Z is oxygen and Y is nitrogen. Of these. prefered embodiments include those compounde O where each R 4 is independently selected from hydrogen. methyl, ethyl. propyl. isopropvl. butyl. isoburvn C mehanol. ethanol. methox. ethox. or amino or where the Rq substituents combine iith the N to form a 5- or 6membered substituted or unsubstituted heterocycloalkyl. optionally subsiruted with an additional oxygen or nitrogen. or combine with the N to form a 5- or 6- membered substituted or unsubstituted heeroan-I The substitutions of these preferred embodiments preferably including methyl, ethyl, propyl. isopropvl. buynl.

isobutyl. methyl ester. ethyl ester. benzvl. phenl. benzo\y. phenox. phenoxvcarbonyl and pyridvl. Preferred forms of this embodiment include compounds where T is absent. or Particularly preferred forms of this embodiment includes compounds wherein R subsituents form with the N of W to form a N. .or N group. which may be optionally substituted by pyridyl. benzyl or phenyl and/or fused with 1-2 additional benzene rings. are preferably hydrogen.

Other preferred embodiments of the present invention includes compounds wherein W is either P(0):-OR or -P(O)(OR 9 m is zero and p is one. Of these, each R, is preferably independently hydrogen.

methyl. ethyl. propyl. isopropyl. butyl or isoburnl. Preferably, in these embodiments. Y is nitrogen. Z is oxygen and X is oxygen. Preferably. m is zero and when n is one. R 4 is preferably hydrogen. T is preferably -CH- or CH:CH:- in these preferred embodiments.

Further preferred embodiments of the present invention include compounds wherein W is either S(O)-R or -S(O) 2 NR., m is zero and p is I Of these, preferred embodiments include where R 9 is hydrogen. or substituted or unsubstituted methyl, ethyl. propyt. isopropyl. butyl or isoburyl. wherein the optional substitution is a 5- or 6- membered cycloalkvl. optionally subsituted with at least one oxygen or nitrogen or a or 6- membered heteroaryl. Further preferred forms of these embodiments include compounds where X is oxygen or a bond. Z is oxygen. T is absent or R,-R are hydrogen. Y is nitrogen and R. is hydrogen.

M

O methyl. ethyl, propyl. isopropyl. butrl, isobuvt. benzvl. benzvlcarbonyL phenyl.

or Preferably. R is hydrogen. methyl. ethyl, propyl. isopropyl. butyl.

l iscburvl. benzrl. or bcnzvicarbonyl.

Further preferred embodiments of the present invention include compounds wherein W is either R. or and m is zero Preferably. n- I when W is C(O)Rq. Of these, preferred embodiments include Scompounds where each R. is independently hydrogen. methyl, ethyl. propyl. isopropyl. buryl. isoburvl. hvdroxvl.

methanol. ethanol. -(CH(OQ))pCOOH (where Q is hydrogen. hvdroxyl. ethoxy or methoxy). or amino. and T is wherein optionally one of the methenyl units is replace with phenoxy. carbonyl or oxygen. Prefered in forms of these embodiments include compounds where X is oxygen or a bond. Z is oxygen. Y is nitrogen and R, O 10 to R- are hydrogen. R 16 when present. is preferably hydrogen.

SFurther preferred embodiments of the present invention include compounds wherein W is an optionally substituted 5- or 6- membered cycloalkvl opionally containing at least one hetcroatom selected from 5. O or N.

or a heteroaryt. wherein the cvcloalkvl or heteraryl may be substituted or attached to a further 5- or 6- membered cycloalky which may optionally contain at least one heteroatom. a 5- or 6- membered heteraryl or a 5- or 6membered aryl.

Preferably, the compounds of the invention exhibit an ICso for inhibiting PARP in vitro, as measured by the methods described herein, of about 20 pM or less. preferably less than about IOpM. more preferably less than about 1 pM. most preferably less than about 0.1 pM.

Preferred embodiments of the present invention include the following compounds, and neutral forms thereof where appropriate..

N H 0 N 0 N 0 13 2005202592 15 Jun 2005 00 0 0 00 00 a 0Z 2005202592 15 Jun 2005

U%

0 0 2-I -0 N-i 0 Zr a

U.

2-I 0 a 2-a 0 2 a 0 3 2005202592 15 Jun 2005 0~' o #14 0\ 9 ax 2005202592 15 Jun 2005

o N o0 N 0 0 Ia e n p .and 0 -N (0 Broadly, the compounds and compositions of the present invention an be used to treat or prevent cell damage or death due to necrosis or apoptosis. cerebral ischemia and reperfusion injury or neurode-enerative diseases in an animal, such as a human. The compounds and compositions of the present invenuon can be used to extend the lifespan and proliferative capacity of cells and thus can be used to trent or prevent diseases associated therewith: they alter gene expression of senescent cells: and the,- radiosensitize hypoxic tumor cells.

Preferably. the compounds and compositons of the invention can be used to treat or prevent tissue damage resulting from cell damage or death due to necrosis or apoptosis. and/or effect neuronal activinty. either mediated or not mediated by NMDA toxicity. The compounds of the present invention are not limited to being useful in treating glutamate mediated neuroo.icity and/or NO-mediated biological pathways. Further. the compounds of the invention can be used to treat or prevent other tissue damage related to PARP activation. as descnbed herein.

The present invention provides compounds which inhibit the in itro and/or in vivo polymerase acuvity of poly(ADP-ribosc) polymerase (PARP). and compositions containing the disclosed compounds.

The present invention proides methods to inhibit. limit and/or control the in vitro and/or in vivo polymernse activin, of poly(ADP-ribose) polymerase (PARP) in any of solutions, cells, tissues. organs or organ systems. In one embodiment, the present invention provides methods of limiting or inhibiting PARP activity in a mammal. such as a human, either locally or systemicallv.

The present invention provides methods to treat and/or prevent diseases, syndromes and/or conditions exacerbated by or involving the increased generation of PARP. These methods involve application or adminstration of the compounds of the present invention to cells. tissues, organs or organ systems of a person in need of such treantment or prevention.

In one embodiment the present invention provides methods to treat and/or prevent cardiovascular tissue damage resulting from cardiac ischemia or reperfusion injury. Reperfusion injury, for instance,. occurs at the termination of cardiac bypass procedures or during cardiac arrest when the heart. once prevented from receiving blood. begins to reperfuse and these methods involve administration of the compounds and compositions of the present invention preferably prior to. or immediately subsequent to reperfusion. such that reperfusion injury is 19prevented. treated or reduced. The present invention also provides methods of preventing and/or treating 0 vascular stroke. cardiovascular disorders Ci In another embodiment, the present invention provides in vitro or in vivo methods to extend or increase the lifespan and/or proliferation capacity of cells and thus also methods to treat and/or prevent diseases associated therewith and induced or exacerbated by cellular senescence including skin aging, atherosclerosis.

I osteoarhritis. osteoporosis. muscular dystrophy. degenerative diseases of skeletal muscle involving replicative senescence, age-related muscular degeneration. immune senescence. AIDS and other immune senescence diseases, and other diseases associated with cellular senescence and aging, as well as to alter the gene expression Sof senescent cells, In a further embodiment, the present invention provides methods of treating or preventing or O ameliorating the effect of cancer and/or to radiosensitize hypoxic tumor cells to render the tumor cells more susceptible to radiation therapy and thereby to prevent the tumor cells from recovering from potentially lethal damage of DNA after radiation therapy. A method of this embodiment is directed to specifically and CN preferentially radiosensitizing rumor cells rendering the rumor cells more susceptible to radiation therapy than non-rumor cells.

In yet another embodiment the present invention provides methods of preventing and/or treating vascular stroke. cardiovascular disorders: to treal other conditions and/or disorders such as age-related muscular degeneration. AIDS and other immune senescence diseases. arthritis. atherosclerosis. cachexia. cancer, degenerative diseases of skeletal muscle involving replicative senescence. diabetes, head trauma, spinal chord injury, immune senescence. inflammatory bowel disorders (such as colitis and Crohn's disease), acute pancreatitis. mucositis. hemorrhagic shock. splanchnic artery occlusion shock multiple organ failure (such as involving any of the kidney. liver, renal, pulmonary. retianl. pancreatic and/or skeletal muscles systems). acute autoimmune thyroidiis. muscular dystrophy. osteoanhritis. osteoporosis, chronic and/or acute pain (such as neuropathic pain), renal failure, retinal ischemia. septic shock (such as endotoxic shock), local and/or remote entothelial cll dysfunction (such are recognized by endo-dependent relaxant responses and up-regulation of adhesion molecules), inflammation and skin aging.

In one embodiment of the present invention, a person diagnosed with acute retinal ischemia or acute vascular stroke is immediately administered parenterall. either by intermiaent or continuous intravenous administration, a compound of any of formulas L 1. IIL IV or V either as a single dose or a series of divided doses of the compound. After this initial treatment and depending on the person's presenting neurological symptoms, the person optionally may receive the same or a different compound of the invention in the form of another parenteral dose. The compound of the invention can be admnistered by intermittent or continuous administration via implantation of a biocompatible. biodegradable polymeric matrix deliver system containing a compound of formula 1. II. III IV or V. or via a subdural pump inserted to administer the compound directly to the infarct area of the brain.

1t In a further embodiment. the present invention provides methods to extend the lifespan and Sproliferative capacity of cells, such as. for example, in using the compounds of the invention as general mediators in the generation of oxidants. proinflammatory mediators and/or e okines and/or general mediators of leukocyte infiltration, calcium ion overload. phospholipid peroxidaion. impaired nitric oxide metabolism and/or reduced ATP production BRIEF DESCRIPTION OF THE DRAWINGS Figure I. Shows the distribution of the cross-sectional infarct area at representative levels along the Srostrocaudal axis, as measured from the interaural line in non-treated animals and in animals treated with S 10 mg/kg of 3.4-dihvdro-5-l- (l-pipendinvl)-boox.-yl -I (2H)-isoquinolinone.

O Figure 2. Shows the effect of intrapentoneal administration of 3.4-dihydro-5- I l-piperidin I )-butoxyJ- If2H)-isoquinolinone on the infarct volume.

Ci DETAILED DESCRIPTION OF THE INVENTION The present invention perains to compounds. pharmaceutical compositions containing the same.

methods of using the same. and process of making the same. wherein such compounds are useful as inhibitors of poly(ADP-ribose) polymerase (PARP). As such. they treat or prevent neural tissue damage resulting from cell damage or death due to necrosis or apoptosis. cerebral ischemia and reperfusion injury or neurode generative diseases in an animal: they extend the lifespan and proliferative capacity of cells and thus can be used to treat or prevent diseases associated therewith: they alter gene expression of senescent cells: and they radiosensiize hypoxic tumor cells. Preferably. the compounds of the invention treat or prevent tissue damage resulting from cell damage or death due to necrosis or apoptosis. and/or effect neuronal activity. either mediated or not mediated by NMDA toxicity. These compounds are thought to interfere with more than the glutamate neurotoxicitv and NO-mediated biological pathways. Further, the compounds of the invention can treat or prevent other tissue damage related to PARP activation.

For example, the compounds of the invention can treat or prevent cardiovascular tissue damage resulting from cardiac ischemia or reperfusion injury. Reperfusion injury. for instance, occurs at the termination of cardiac bypass procedures or during cardiac arrest when the heart once prevented from recei\ing blood.

begins to reperfuse.

The compounds of the present invention can also be used to extend or increase the lifespan or proliferation of cells and thus to treat or prevent diseases associated therewith and induced or exacerbated by cellular senescence including skin aging, atherosclerosis, osteoarthritis. osteoporosis. muscular dvstrophy.

degenerative diseases of skeletal muscle involving replicative senescence, age-related muscular degeneration.

immune senescence. AIDS and other immune senescence diseases. and other diseases associated with cellular senescence and aging, as well as to alter the gene expression of senescent cells. These compounds can also be used to treat cancer and to radiosensitize hypoxic rumor cells to render die tumor cells more susceptible to -21 Sradiation therapy and to prevent the tumor cells from recoverng from potentially lethal damage of DNA after O radiation therapy. presumably by their ability to prevent DNA repair. The compounds of the present invention C can be used to prevent or trcat vascular stroke: to treat or prevent cardiovascular disorders: to treat other conditions and/or disorders such as age-related muscular degeneration AIDS and other immune senescence diseases. arthritis. atherosclerosis: cachexia. cancer. degenerative diseases of skeletal muscle involving replicative senescence, diabetes, head trauma, immune senescence. inflammatory bowel disorders (such as colitis and Crohn's disease). muscular dystrophy. ostoarthrilis. osteoporosis. chronic and/or acute pain (such as Cneuropathic pain). renal failure. retinal ischemia. septic shock (such as endotoxic shock), and skin aging.

P Preferably. the compounds of the invention act as PARP inhibitors to treat or prevent tissue damage resulting from cell death or damage due to necrosis or apoptosis: to treat or prevent neural tissue damage Sresulting from cerebral ischemia and reperfusion injury or neurodegenerative diseases in an animal: to extend Sand increase the lifespan and proliferative capacity of cells: to alter gene expression of senescent cells: and to Sradiosensitize tumor cells.

SAnother especially preferred embodiment of the invention is a pharmaceutical composition which comprises a therapeutically effecuive amount of the compound of formula I. II or III: and (ii) a pharmaceutically acceptable carner.

As used herein. "alkyl" means a branched or unbranched saturated hydrocarbon chain comprising a designated number of carbon atoms. For example. straight or branched alk y hydrocarbon chain contains I to 6 carbon atoms. and includes but is not limited to substituents such as methyl. ethyl propyl. iso-propyl.

buryl. iso-bunl. tert-butl. n-pen l. n-hex.v. and the like. unless otherwise indicated.

"Alkenvl" means a branched or unbranched unsaturated hydrocarbon chain comprising a designated number of carbon atoms. For example. C:-C6 straight or branched alkenvl hydrocarbon chain contains 2 to 6 carbon atoms having at least one double bond. and includes but is not limited to substituents such as ethenvl.

propenyl. isopropenyl. butenyl. iso-burenyl. ten-butenyl. n-pentenyl. n-hexenyl. and the like. unless otherwise indicated.

"Alkox.". means the group -OR wherein R is alkyl as herein defined. Preferably. R is a branched or unbranched saturated hydrocarbon chain containing I to 6 carbon atoms.

"Cyclo". used herein as a prefix, refers to a structure characterized by a closed ring.

"Halo" means at least one fluoro. chloro. bromo, or iodo moiety, unless otherwise indicated.

"Amino" compounds include amine (NH) as well as substituted amino groups comprising alkyls of one through six carbons.

"anr'" or "heteroaryl" means a moiecy which is substituted or unsubstituted. especially a cyclic or fused cyclic ring and includes a mono-. bi-. or tricyclic. carbo- or heterocyclic ring. wherein the ring is either unsubstituted or substituted in one to five position(s) with halo. haloalkvl. hydroxl. nitro. trifluoromethyl. C,-C4 straight or branched chain alkyl. Cl-C, straight or branched chain alkenyl. Ci-C6 alkoxy. alkenyloxy.

phenoxy. benzvloxy. amino. thiocarbonyl. ester, thioester. cyano. imino, alllamino. aminoalkyl. sulhvdryl.

l thioalkvl. and sulfonyl: wherein the individual ring sizes are preferably 5-8 members: wherein the hetcrocyclic O ring contains 1-4 hetcroaomn(s) selected from the group consisting of N. or S wherein aromatic or tertiary Cl alkvl amines are optionally oxidized to a corresponding N-oxide. Heteroaryls may be attached to other rings or Ssubstituted through the heteroatom and/or carbon atom of the ring. Panicularly preferred arl or heroaryl moieties include but are not limited to phenyl. benzvl naphthyl. pyrrolyl. pyrrolidinyl. pyridinvl. pyrimidinyl.

purinyl. quinolinyl. isoquinolinyl. furL. thiophenyl. imidazolyl. oxazoil. thiazolyl. pyrazolyl. and thienyl.

"Phenyl" includes all possible isomeric phenyl radicals. optionally monosubstituted or multi-substituted with subsutuents selected from the group consisting of amino. trifluoromethyl. Ci-C straight or branched chain 0alkvl. Ci-C, straight or branched chain alkenyl. carbonyl. thiocarbonyv. ester, thioester. alkoxy. alkenoxy. cyano.

nitro. imino. alkylamino. aminoalkvl. sulfhydryl. thioalkvl. suffonyl. hydrox., halo. haloalkvl. NR 1 wherein R 2 is O selected from the group consisting of hydrogen. (Ci-C,)-straight or branched chain alkvl. straight or V. branched chain alkenyl or alkvnyl. and (Ci-C 4 bridging alkvl wherein said bridging alkvl forms a hererocyclic Sring starting with the nitrogen of NR, and ending ith one of the carbon atoms of said alkl or alkenyl chain.

and wherein said heterocyclic ring is optionally fused to an Ar group.

Cycloalkvy optionally containing at least one heteroatom includes saturated rings. prferably C: or C, rings. wherein at 1-4 heteroatoms selected from 0. N or S may be optionally substituted for a carbon atom of the ring. Cycloalkyls optionally containing at least one heteroatom. as described above. may be substituted by or fused to at least one 5 or 6 membered aryl or heteroaryl. Prefered cycloalklts containing a heteroatom include pyrrolidinyl. imidazolidinvl. pyrazolidinyl. piperidinyl. piperazinyl. morpholino and thiomorpholino.

The compounds of the present invention possess one or more asymmetric ceniers) and thus can be produced as mixtures (racemic and non-racemici of siereoisomers, or as individual enantiomers or diastereomers. The individual stereoisomers may be obtained by using an optically active starting material, by resolving a racemic or non-racemic mixture of an intermediate at some appropriate stage of the synthesis. or by resolution of the compound of any of formulas 1. I. III. IVand V. It is undersiood that the individual stereoisomers as well as mixtures (racemic and non- racemici of sterecisomers are encompassed by the scope of the present invention. The S-stereoisomer at atom I of formula is most preferred due to its greater activity.

"Isomers" are different compounds that have the same molecular formula and includes cyclic isomers such as (iso)indole and other isomeric forms of cyclic moieties. "Stereoisomers" are isomers that differ only in the way the atoms are arranged in space. "Enantiomers" are a pair of stereoisomers that are non-superimposable mirror images of each other. "Diastereoisomers" are stereoisomers which are not mirror images of each other.

"Racemic mixture" means a mixture containing equal parts of individual enantiomers. "Non-racemic mixture" is a mixture containing unequal parts of individual enantiomers or stereoisomers.

The compounds of the invention are useful in a free base form. in the form of plharmaceutically acceptable salts. pharmaceutically acceptable hydrates. phannaceutically acceptable esters. pharmaceutically acceptable solvates. pharmaceutically acceptable prodrugs, pharmaceutically acceptable metabolites. and in the -23- Sform of pharmaccutically acceptable stereoisomers. These forms are all within the scope of the invention. In 0 Spractice. the use of these forms amounts to use of the neutral compound.

Cl Pharmaceutically acceptable salt". 'hydrate". "ester or "solvateC refers to a salt. hydrate. ester. or solvate of the inventive compounds which possesses the desired pharmacological activity and which is neither biologically nor otherwise undesirable. Organic acids can be used to produce salts, hydrates, esters. or solvates such as acetate. adipate. alginate. aspanate. benzoae. benzenesulfonate, p-toluenesulfonae. bisulfate. sulfamate.

sulfate. naphthylate. butyrate. citrate. camphorate. camphorsulfonate. cyclopentane-propionate. digluconame, l dodecylsulfate. ethanesulfonate. fumarate. glucoheptanoate. glyccrophosphatc. hemisulfate heptanoate.

0hexanoate. 2-hydroxvethanesulfonate. lactate. maleate. methanesulfonate. 2-naphthalenesuifonate. nicotinate.

oxalate. cosvlate and undecanoate. Inorganic acids can be used to produce salts. hydrates. esters. or solvates such as hydrochloride. hydrobromide. hydroiodide. and thiocvanate.

I Examples of suitable base salts, hydrates, esters. or solvates include hydroxides, carbonates, and Sbicarbonates of ammonia. alkali metal salts such as sodium, lithium and potassium salts. alkaline earth metal salts such as calcium and magnesium salts. aluminum salts. and zinc salts.

Salts. hydrates. esters. or solvates may also be formed with organic bases. Organic bases suitable for the formation of pharmaceutically acceptable base addition salts, hydrates, esters. or solvates of the compounds of the present invention include those that are non-toxic and strong enough to form such salts. hydrates, esters, or solvates. For purposes of illustration, the class of such organic bases may include mono-. di-. and trialkylamines. such as methylaminc. dimethylamine. triethylamine and dicyclohex-ylamine: mono-. di- or trihydro.-valkylamines. such as mono-, di-. and tnethanolamine: amino acids, such as arginine and tysine: guanidine: N-methyl-glucosamine: N-methyl-glucamine: L-glutamine: N-methyl-piperazine: morpholine: ethylenediamine: N-benzvl-phenethylamine: (trihydroxy.-methyl)aminoethanc: and the like. See. for example.

Tharmaceutical Salts." J. Pharm. Sci.. 66:1. 1-19 (1977). Accordingly. basic nitrogen-containing groups can be quaternized with agents including: lower alkyv halides such as methyl, ethyl. propyl. and burvl chlorides.

bromides and iodides: dialkyi sulfates such as dimethyl, diethyl. dibutyl and diamyl sulfates: long chain halides such as dccyl. lauryl. myristyl and stearyl chlorides, bromides and iodides: and aralkyi halides such as benzvl and phenethyl bromides.

The acid addition salts. hydrates. esters. or solvates of the basic compounds may be prepared either by dissolving the free base of a PARP inhibitor of the present invention in an aqueous or an aqueous alcohol solution or other suitable solvent containing the appropriate acid or base, and isolating the salt by evaporating the solution. Alternatively. the free base of the PARP inhibitor of the present invention can be reacted with an acid. as well as reacting the PARP inhibitor having an acid group thereon with a base, such that the reactions are in an organic solvent, in which case the salt separates directly or can be obtained by concentrating the solution.

"Phannacutically acceptable prodrug" refers to a derivative of the inventive compounds which undergoes biotransformation prior to exhibiting its pharmacological effect(s). The prodrue is formulated with the objective(s) of improved chemical stability, improved patient acceptance and compliance, improved Sbioavailability. prolonged duration of action. improved organ selectivity., improved formulation increased o hydrosolubility). and/or decreased side effects toxicity). The prodrug can be readily prepared from the il inventive compounds using methods known in the art. such as those described by Burger's Medicinal Chemistry and Drug Chemisry. Fifth Ed.. Vol. 1. pp. 172-178. 949-982 (1995). For example. the inventive compounds can be transformed into prddrugs by converting one or more of the hydroxy or carboxy groups into esters.

I, "Pharmaceutically acceptable metabolite" refers to drugs that have undergone a metabolic transformation. After entry into the body. most drugs are substrates for chemical reactions that may change their physical properties and biologic effects. These metabolic conversions, which usually affect the polariry of the compound. alter the way in which drugs are distributed in and excreted from the body However, in some cases.

1i metabolism of a drug is required for therapeutic effect. For example, anticancer drugs of the antimetabolite class O must be convened to their active forms after they have been transported into a cancer cell. Since most drugs C(l undergo metabolic transformation of some kind, the biochemical reactions that play a role in drug metabolism o may be numerous and diverse. The main site of drug metabolism is the liver, although other tissues may also Cparticipate- The term "neurodegenerative diseases" includes Alzheimer's disease, Parkinson's disease and Huntington's disease.

The term "nervous insult" refers to any damage to nervous tissue and any disability or death resulting therefrom. The cause of nervous insult may be metabolic, toxic. neurotoxic, iairogenic. thermal or chemical, and includes without limitation, ischemia- hypoxia. cerebrovascular accident, trauma, surgery, pressure. mass effect.

hemnnorrhage. radiation. vasospasmn neurodegenerative disease, infection. Parkinson's disease, amyotrophic lateral sclerosis (ALS). myelination/demyelination process. epilepsy, cognitive disorder. glutamate abnormality and secondary effects thereof.

The term "neuroprotective" refers to the effect of reducing. arresting or ameliorating nervous insult, and protecting, resuscitating, or reviving nervous tissue that has suffered nervous insult.

The term "preventing neurodegeneration" includes the ability to prevent neurodegeneraion in patients diagnosed as having a neurodegenerative disease or who are at risk of developing a neurodegenerative disease.

The term also encompasses preventing further neurodegeneration in patients who are already suffering from or have symptoms of a neurodegenerative disease.

The term "treating" refers to: preventing a disease. disorder or condition from occurring in an animal that may be predisposed to the disease, disorder and/or condition, but has not yet been diagnosed as having it: (ii) inhibiting the disease, disorder or condition, arresting its development: and (iii) relieving the disease. disorder or condition. causing regression of the disease, disorder and/or condition.

The term "neural tissue damage resulting from ischemia and reperfusion injury and neurodegenerative diseases" includes neurotoxicity, such as seen in vascular stroke and global and focal ischemia.

25 A feature characteristic of many of these transformations is that the metabolic products arc more polar 0 than the parent drugs. although a polar drug does sometimes yield a less polar product. Substances with high lipid/water partition coefficients, which pass easily across membranes, also diffuse back readily from tubular urine through the renal tubular cells into the plasma. Thus. such substances tend to have a low renal clearance and a long persistence in the body. If a drug is metabolized to a more polar compound, one with a lower partition coefficient, its tubular reabsorption will be greatly reduced. Moreover. the specific secretory mechanisms for anions and cations in the proximal renal tubules and in the parenchvmal liver cells operate upon highly polar substances.

ci As a specific example. phenacetin (acetophenetidin) and acetanilide are both mild analgesic and it) 10 antipyretic agents. but are each transformed within the body to a more polar and more effective metabolite. p- Svhydroxv.aceranilid (acetaminophen). which is widely used today. When a dose of acetanilid is given to a person.

Cl the successive metabolites peak and decay in the plasma sequentially. During the first hour. acetanilid is the Sprincipal plasma component. In the second hour. as the acetanilid level falls, the metabolite acetaminophen Ci concentration reaches a peak. Finally. after a few hours, the principal plasma component is a further metabolite that is inert and can be excreted from the body. Thus. the plasma concentrations of one or more metabolites. as well as the drug itself. can be pharmacologically important.

The reactions involved in drug metabolism are often classified into two groups, as shown in the Table U. Phase 1 (or functionalization) reactions generally consist of oxidative and reductive reactions that alter and create new functional groups and hydrolytic reactions that cleave esters and amides to release masked functional groups. These changes arc usually in the direction of increased polarity.

Phase II reactions are conjugation reactions in which the drug. or often a metabolite of the drug. is coupled to an endogenous substrate, such as glucuronic acid, acetic acid. or sulfuric acid.

TABLE II Phase Reactions (functionalization reactions): Oxidation via the hepatic microsomal P450 system: Aliphatic oxidation Aromauc hydroxyvation N-Dealkylation O-Dealkvlation S-Dcalkvlation Epoxidation Oxidative dcamination Sulfoxide formation Desulfration N-Oxidation and N-hydroxylation Dehalogenation Oxidation via nonmicrosomal mechanisms: Alcohol and aldehyde oxidation Purine oxidation 0O Oxidative deamination (monoamine oxidase and diamine oxidase) Reduction: -26 n Azo and nitro reduction S(4) Hydrolysis: SEster and amide hydrolysis C1 Peptide bond hydrolysis S 5 Epoxide hydration Phase Ii Reactions (coniugation reactions): It" Glucuronidation Acetylation Mercapturic acid formation Sulfate conjugation Cl and S-methylation 0\ Trans-sulfuration 0 15 The compounds of the present invention exhibit pharmacological activity and are. therefore. useful as In pharmaceuticals. In particular, the compounds exhibit central nervous and cardiac vesicular system activity.

O It is understood that tautomeric forms, when possible, are included in the invention. For example. the Cl tautomeric forms of the following compounds are exemplary: H 0 Z Z

H

N N

NH

X N

N

R R R R Many of the PARP inhibitors are known and. thus. can be synthesized by known methods from starting materials that are known. may be available commercially. or may be prepared by methods used to prepare corresponding compounds in the literature. See. for example. Suto et "Dihydroiso-quinolinones: The Design and Synthesis of a New Series of Potent Inhibitors of Poly(ADP-ribose) Polymerase". Anticancer Drug Des.. 6:107-17 (1991), which discloses processes for synthesizing a number of different PARP inhibitors.

Typically, the PARP inhibitors used in the composition of the invention will have an IC. for inhibiting poly(ADP-ribose) polymerase in vitro of about 20 pM or less. preferably less than about 10pM. more preferably less than about 1 M. most preferably less than about 0. pM.

The PARP inhibitor 3.4-dihydro-5-14-(l-piperidinyl)butoxy]-l(2H)-isoquinolinonc. for example. has been reported to inhibit PARP with an IC, of 40 nM by Suto et al.. cited above.

27 There are multiple routes which may be undertaken to prepare the compounds of the present invention.

o Two of these routes for the preparation of the xanthene derivatives of this invention are demonstrated below by Sschemes 1-3 and 4-7.

The xanthene ring may be generically substituted as set forth in formula I. Such xanthene starting n 5 derivatives arc known in the chemistry literary and are accessible by processes known to one skilled in the art.

The process sequence set forth herein does not present an exact sequence of reactions by which the compound must be made: that is. the sequence of reactions can be rearranged in several ways to reach the target molecule.

ON

ti 10 DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS In The xanthene and hioxanthene derivatives of this invention are represented by previously defined O formulas I-V. As an example, the xanthene derivatives of this invention can be prepared in a conventional manner as illustrated below by Schemes I 5. The xanthene ring may be generically substituted as set forth in formula i. Such xanthene starting derivatives are known in the chemistry literature and accessible by processes known to one skilled in the art. The process sequence set forth herein does not present an exact sequence of reactions by which the compound must be made: that is. the sequence of reactions can be rearranged in several ways to reach the target molecule. Scheme I below illustrates schematically the preparation of compounds Example I through Examples 4.

Scheme I 28 00 o CONK NaH 4 I NHz phosgene N PPA 6 /Step 1 0 Step 2 Step 3

N

1 2 3 0 o 0 NH OS CI NH RNH2/TEA NH In I OSO 2

CI

O oGeneral C Procedure A Procedure B In N N Nf o ~SO 2 CI S 2

H

6 S4 Step 1 9-Aminomchrvxanthene 2 is available by reduction of 9-carboxamide I usine sodium boronhdride in dioxane. Other reduction methods can be substnuted include lithium aluminum hydride and other boronhydrides. The solvent can also be varied. DMSO. etrahdrofuran. diethyvlether and other organic solvent can be used The temperature of the reaction is general between 0 oC and 200 oC. For example. 9aminomethvlxanthene can be made as follows: To a stirred suspension of sodium boronhvdride (1.39g. 50 mmol) and 9-xanthenecarboxamide (1.2 5g. 10 mmol) in dioxane (20mL) is added acetic acid (3.0g. 50 mmol) in dioxane (10mL over a peiiod of 10 minutes at 10 OC. The reaction mixture is stirred at reflux for 2 hours and concentrated to dryness in vacuo. The excess reductive reagent is decomposed with water and the mixture is extracted with chloroform. The chloroform layer is washed with water. dned over anhydrous sodium sulfate and evaporated in vacuo. The residue is purified by silica gel column chromatography (ethvlacerate: methanol. 9:1 as elant) to give a white solid (1.6 g. 7.6 mmol) in 76.2% vield.

Step 2 The 9-isocvanomehvrlanthenes 3 is obtained by condensation of the amino group with phosgene in a heated solution of toluene. Other solvents. such as p-nitrobenzene. can also be used. The new formed isocano functionality serves as an electrophile for intermolecular Friedle-Crafts reaction in next step. Other functionalities include N-carbonvlimidazole. N-carbonvlbenzotriazole and N-ethvlformate can also be applied in this type of reactions. These functionalities can be formed by reactions of the 9-aminomethvlxartthenes 2 with caronvldiimidazole. carbonvldibenzonazole and ethyl chloroformate respectively.

29 0 oStep 3 C The desired xanthane product. 3.4-dihydrobenzopyrano[4,3.2-deisoquinoli-l-one 4 can be obtained by an intramolecular Friedle-Crafts acylation using acid as catalyst. Zinc chloride, aluminum chloride, titanium (IV) chloride, hydrochloric acid or acetic acid may be used. but polyphosphoric acid is often preferred for this type of intramolecular cycloaddiions. The temperature can vary from 0 150 oC For example, 3,4dihydrobenzopyrano[4.3.2-delisoquinolin-l-one 4 can be prepared as follows: To a liquid of 12 g of Ci polyphosphoric acid in a 500 mL beaker is added 9-xanthenemethylisocyanide 3 (2.37 g. 10 mmol) portion wise with manual stirring at 90 eC. The mixture is stirred for three minutes and then 100 g of more polyphosphoric acid is added. Vigorous stirring is applied for four minutes when temperature is kept at 90 The mixture is Sallowed to cool to 60 "C and 40 g of crushed ice is added until the polyphophoric acid is completely hydrolvzed o. and a brown solid is separated. The solid is collected by vacuum filtration and then recrystallized in Schloroform to afford a unsarurated product f0.15 g. 0.63 nmmol) in 6.3% vield.

The solid is dissolved in glacial acetic acid (100 mL) and the solution is placed in a hydrogenation bomb. Palladium (10% on carbon. 500 mg) is added. The bomb is set pressure at 2000 psi. The mixure of the content is stirred for 20 hours under the pressure and poured through a fluted filter paper to remove the catalyst.

Tlhe solvent of the filtrate is removed in vacuo to give a yellow solid, which is recrystallized in chloroform to afford desired product (0.95 g. 4.0 mmol) in 80 yield.

Monosulfonation of 3.4-dihydrob.:nzop-ranojl.3.2-dejisoquinoli-l-one 4 can be achieved using chorosulfonic acid neat to give compound 5. The temperature can vanr from -20 to 100 Amidation of compound 5 can be carried out by a variety of conditions known to those skilled in the art. including reaction with first or secondary amines using pvridine or triethyl amine as base. Typical solvents include chlorinated solvents. various ethers, and dipolar aprotic solvents like DMF. Thus final products of compounds 6 can be prepared from 3.4-dihvdrobenzopvrano[4.3.2-de|isoquinoli-l-one 4 using General procedure A and B.

Scheme 2 below illustrates schematically the preparation of compounds Example 5 through Example 9.

Scheme 2

CN

CN

NO

2 7

COOH

O

R

Na

^R

Step 4

DMF

C CN

ORCN

IO

Step

H

2 SOd/ AcOH Step 6 CH2N2 COOMe O O

R

General Procedure C

NH

2

NH

2 Example 5 9 Step 4 Preparation of 3-phenoxyphthalonirile 7 The staning materials 3-nitrophthalonitrile 7 and or psubstitrued phenoxide 8 are either readily available from commercialsources or can be prepared by known methods by those skilled in the an. The desired compound can be easily obtained by coupling the orthodinitrile with the phenoxide salt in dipolar aprotic solvent such as DMF. low dialkyi ketones. lower alkvy nitriles.

Temperature range can be 0 150 0C. For example, a mixture of 0.1 Mol of 3-nitrophthalonitrile and 0.14 Mol of sodium phenoxide (or p-substituted phenoxide) in 120 ml of dry DMF is mechanically stirred for 2.5 hours at room temperature and then poured into water. The precipitate is collected by filtration, washed with water, and dried under vacuum to give 19 g (0.086 Mol. 36%) of the compound 9. mp 110-112 OC.

Step Preparation of 9-oxoxanhene-l-carboxyic acid 10. The formation of onhocarboxlic acid groups from the cvano groups can be achieved by hydrolysis of the aryl nitrile with either mineral acids. include sulfuric acids and hydrochloric acids, or strong inorganic base. These conditions are understood by those skilled in the an. An intramolecular Friedle-Crafts acylation can occur as soon as the diacids are formed to afford 9-xoxanthene-lcarboxylic acid 10. For example, a solution of 0.1 Mol of 3-phenoyphthalonitrile is dissolved in 150 ml of a mixture of 60 per cent sulfuric acid and glacial acid. The mi.umre is refluxed for 6 hours and then poured into 1000 mL of ice-cold water. pH value of the suspension is adjusted to 10 with sodium carbonate. Impurities are extracted out by partitioning of the basified solution with ethyl acetate. Precipitation is formed upon adding -31hydrogen chloride (to pHS) to the aqueous solution, and collected by filtration to give a designed acid in yield.

Step 6 Preparation of 9-oxoxanthene-l-carbo.ylic acid methyl ester 11.

Esterification of acid can be achieved by several conventional methods by those skilled in the an. These procedures include utilizing diazomethane or methyl alcohol catalyzed by mineral acids. For example. ethereal diazomethane solution can be prepared from N-methyl-N-nitrsotoluene-p-sulphonamide and potassium hydroxide from a water bath. 9-Oxoxanthenc-l-carbo.xylic acid (1.29g. 5 mmol) in absolute methanol is added to this ethereal diazomethane solution at 0 oC until a pale yellow color formed. Removal of the solvent provides the desired ester solid in 100% yield. Thus the final products. Examples 5 9. can be prepared by condensation hydrazine with the keronester 11 as described in General procedure C.

Scheme 3 below illustrates schematically the preparation of compounds Example 10 through Example 11.

Scheme 3 oCOOMe 0

OO

NO

2 11 Step 7

H

2 R NO 2 General Procedure C

NH

2

NH

2

NH

2 13 General Procedure F

RCOOR

Example 10 -11 Step 7 Preparation of 7-amino-9-oxoxanthene-l-carboxylic acid methyl ester 12. Reduction of the nitro group can be carried out under catalytic hydrogenation conditions utilizing metal catalysts described in aldrichimica Acta 1979:12. or with hydrazine. metal hydride reducing agents such as NaBH4, B 2 H6. and the like. Suitable solvents include water. lower alcohol, ethers. THF. lower alkvl organic acids such as acetic acid. Temperature can vary from 0 100 oC. Desired final products. Examples 11 -12. can be prepared by condensing the -32kewnester 12 with hydrazine using General procedure C. followed by an amide bond formation of the phthalazine derivative 13 using General procedure F.

Scheme 4 below illustrates schematically the preparation of Example 12 through Examples 24.

Scheme 4 .COOMe Step 9

NBS

COOMe CHr cH8r General Procedure D or E RNH2 or ROH, RSH COOMe

O

CH

2

XR

X= NH, O, S General Procedure C

NH

2

NH

2

O

N

'CH

2

XR

Example 12 24 Step 9 Preparation of 7-bromomethyl-9-axoxanthene-l-carbox Yic acid methyl ester 14. Brominating agents include N-bromosuccinimide. bromine. complcxed bromine such as pyridinium bromide, perbromide. and the like can be used to convert 7-methyl-9-oxoxanthene-l-carboxylic acid methyl ester 11 to 7-bromomethyl-9oxoxanthene- -carboxylic acid methyl ester 14. Solvents include chlorinated hydrocarbones. dipolar aprotic solvents, and various ethers. Temperature can range from 0 100 oC. For example, a suspension of 7-methyl- 9-oxoxanthene-l-carboxvlic acid methyl ester (0.1 Mol). N-bromosuccinimide (0.12 Mol) and benzoylperoxide mg) in dry carbon tetrachloride (300 mL) is stirred at 60 oC for 6 hours. The mixure is filtered, the solid is washed successively with small amounts of chloroform- water and ether, and then dried to leave a desired product as white solid.

Displacement of the bromo group of compound 14 with nucleophiles such as amine or alcohol. thiol using General procedure D or E provides the compound 15. The ketonestcr 15 can be cyclized with hydrazinc using General procedure C to give desired final products. Example 12 -24.

Scheme 5 below illustrates schematically the preparation of Example 26 through Example 29.

-33 COOMe O0 General Procedure A COOMe °0 Or SOC S0 2 l General Procedure B RNH2 COOMe S0 2

SO

2

NHR

General Procedure C

NH

2

NH

2 0

N

N

iSO

SONHI

Example 26 -29 Monosulfonation of the ketone eser 11 to give compound 16 can be achieved using neat chorosulfonic acid to react with the substrate II. The temperature can vary from -20 to 100 Amidation of compound 16 can be carried out by a variety of conditions knowv to those skilled in the art. including reacuon with first or secondary amines using pyridine or trethyl amine as base. Typical solvents include chlorinated solvents.

various ethers, and dipolar aprotic solvents like DMF Thus final product of compounds can be prepared from compound 17 and hydrazine as described in General procedure C.

General procedure A: To a liquid of chlorosulfonic acid (10 mL) is added the compound 5 or ketone ester (11. 7.87 mmol) under nitrogen at 0 oC. The resulting mixture is allowed to warm to room temperature, conunuously stirred for about 2 days and poured onto 100 g of ice. The residue is collected by filtration and washed with water. ethanol to afford the product 5 or 16 as solid in 80% of yield.

General procedure B: To a suspension of the sulfonyl chloride 5 or (16. 5.67 mmol) in methylene chloride (100 mL) is added triethyl amine (1.6 mL) and amine compound (5 mmol) under nitrogen at 0 0 C. The reaction mixture is allowed to warm to room temperature. stirred continuously for 1 hour and poured into 100 mL of water. The organic layer is collected. washed with water, brine and concentrated in vacuo. The product is purified via crystallization or silica column chromatography using methanol/methylene chloride as eluent to afford solid product in 60 90% of yield.

-34-

O

o General procedure C: l A benzopvrano[4.3.2-delphthalazine ring can be formed by condensation of the ketone ester with Shvdrazine. To a solution ofthe ketonesier 11 or 15. (17. 5 mmol) in absolute ethanol (10 mL) is added anhvdrous hvdrazine in ethanol (1 mn.) drop wise at room temperature. The solution is refluxed for overnight and cooled to room temperature. Ice-cold water (100 mL) is added and brown solid is separated. The solid is collected by vacuum filtration and washed with water, small amount of methanol to give a solid product in 10 of yield.

C 10 General procedure D: LC To a soluuon of the bromo compound (14. 10 mmol) in dry DMF (100 mL) is added potassium 0 carbonate (100 mmol) and secondary amine (10 mmol). The reaction mixture is heated to 70 C for 6 hours and C cooled to 0 Water (100 mL) is added to the reaction mixture, followed by ethyl acetate (200 mL). The organic layer is collected, washed with water. brine and dried over sodium sulfate. The solvent is removed in vacuo. The residue is purified by column chromatography on silica gel using ethyl acetate /heane as eluent to give the product 15 in 60 90% of ield.

General procedure E: To a stirred solution of the bromo compound 14 (10 mmol) and phenol derivative or thiol derivative mmol) in acetone (150 mL) is added potassium carbonate (100 mmol). The reaction mixture is heated to reflux for 6 hours. The solvent is then removed in vacuo. and water (100 mL) and ethylacetate (100 mL) are added to the residue. The organic layer is collected. washed with water, brine and dried over sodium sulfate. The solvent is removed in vacuo. The residue is purnfied by column chromatography on silica gel using ethyl acetate /hexane as eluent to give the product 15 in 60 SO' of yield.

General procedure F: To a suspension of compound phthalazine derivative 13 (10 mmol) in dry DMF (20 mL) is added succinic or acetic anhydride (11 ummol). The mixture is heated to 110 C for 3 hours and cooled to room temperature. The mixture is continuously stirred for 2 hours after addition ofTHF (100 mL). The solid is collected by filtration, washed with methanol to afford a desired product without further purification.

Other manners. variations or sequences of preparing the compounds of Formula I will be readily apparent to those skilled in the art.

The compounds of formula I may be useful in the free base form. in the form of base salts where possible. and in the form of addition salts. as well as in the free acid form. All these forms are within the scope of this invention. In practice. use of the salt form amounts to use of the base form. Pharmaccutically acceptable Ssalts within the scope of this invention are those derived from mineral acids such as hydrochloric acid 0 O and sulfuric acid; and organic acids such as ethanesulfonic acid, benzenesulfonic acid, p-toluene- C sulfonic acid, and the like, giving the hydrochloride, sulfonate, ethanesulfonate, benzenesulfonate, p- Stoluenesulfonate, and the like respectively, or those derived from bases such as suitable organic and inorganic bases. Examples of pharmaceutically acceptable base addition salts with compounds of the J present invention include organic bases which are nontoxic and strong enough to form such salts. These organic bases and the use thereof are readily understood by those skilled in the art. Merely for the purpose of illustration, such organic bases may include mono-, di-, and trialkylamines, such as \methylamine, diethylamine and triethylamine; mono-, di-, or trihydroxyalkylamines such as mono-, di-, S 10 and triethanolamine; amino acids such as arginine, and lysine; guanidine; N-methylglucosamine; N- O methylgiucamine; L-glutamine; N-methylpiperazine; morpholine; ethylenedianane; Nl benzylphenethylamine; tris(hydroxymethyl)antinoethane; and the like.

SThe acid addition salts of the basic compounds may he prepared by dissolving the free base of C the compound of formula I in aqueous or aqueous alcohol solution or other suitable solvents containing the appropriate acid or base and isolating the salt by evaporating the solution, or by reacting the free base of the compound of formula I with an acid as well as reacting the compound of formula I having an acid group thereon with a base such that the reactions are in an organic solvent, in which case the salt separates directly or can be obtained by concentration of the solution.

The compounds of this invention contain one or more asymmetric carbon atoms. Therefore, the invention includes the individual stereoisomers and mixtures thereof as well as the racemic compounds. The individual isomers may be prepared or isolated by methods known in the art.

The compounds of the invention exhibit pharmacological activity and are, therefore, useful as pharmaceuticals. In particular the compounds exhibit central nervous and cardiac vesicular system activity.

Example 1

H

0 To a solution of 0.3g of compound 4 in 7.5 mL of concentrate sulfuric acid is dropwiseadded 2.0 mL of fuming sulfuric acid at 0 OC. The mixture is stirred for 3 hours at 0 oC and poured into 100 mL of ice-cold water. The precipitation is collected by filtration, washed with water to give 0.17 g of a white solid, mp >300 1 H-NMR (400 MHz, DMSO-d6): 8.20(d, 1 H, 4Hz); 7.62(d, 1H, 8Hz); 7.53(s, I1H); 7.51(d, H, 8Hz); 7.41(t, 1H, 8Hz); 7.30(d, IH, 8.0Hz); 7.09(d, 1H, 4.50-4.55(dd, 1H, 8Hz, 12Hz); 4.02-3.96(m, 1H); 3.46(t, 1H, 12Hz).

-36- Example 2

SH

S0 N N 3

H

0 Prepared from compound 5 and N-(2-aminoethyl)piperidine according to General Procedure B.

Purification of compound by crystallization in water-acetone gives a white solid, mp 265 -269 oC. 1

H-

NMR (400 MHz, DMSO-d6): 8.35(m, IH), 7.82 1H), 7.75 IH), 7.67 1H), 7.46 7.43 (m, CI IH), 7.37 1H), 4.58 4.54 IH), 4.10 1H), 3.53 -3.47 1H), 3.39 2H), 3.06 (bs, 2H), O 3.02 (bs, 2H), 2.32 2H), 1.44 1.19(m, 6H).

SExample 3 CN H 0

N

Prepared from compound 5 and N-methylpiperazine according to General Procedure B. Purification of compound by crystallization in acetic acid gives a white solid, mp 300 oC 1 H-NMR (400 MHz, CDC13): 7.78-7.84 J 8 Hz, 1 7.58-7.64 J 8 Hz, 1 7.53 I 7.32-7.40 J 8, 16 Hz, I 7.16-7.26 2 6.30 (br s, 1 4.36-4.50 J 6, 14, 20 Hz, 1 4.02-4.12 1 H), 3.60-3.74 J 12, 24 Hz, 1 3.01 (br s, 4 2.46 (br s, 4 2.24. 3 H).

Example 4

H

o 0 N I I 0 N~CH 3 Prepared from compound 5 and N-acetylpiperazine according to General Procedure B. Purification of compound by crystallization in acetic acid gives a white solid (45% yield), mp 290 OC IH-NMR (400 MHz, CDC13): 7.88-7.93 J 8 Hz, 1 7.67-7.72 (dd, J 4, 12 Hz, 1 7.62 1 7.43- 7.49 J 8, 16 Hz, 1 7.27-7.36 2 4.54-4.62 (dd, J 8, 20 Hz, 1 4.15-4.25 I H), 3.70-3.85 3 3.59(s, 2 3.04 4 2.06 3 H).

-37- Example N 1*1 Prepared from the compound 11 (R Me) and hydrazine according to General Procedure C.

Purification of compound by crystallization in ethanol gives a whit flake solid (44% yield). mp 332 334 oC.

1 H-NMR (400 MHz. DMSO-d6): 12.5 br, 18); 7.90 7.87 3) 7.69 (dd, 1- 7.2. 1.9 Hz. 18: 7.38 (dd. J= 8.8. 1.9 Hz. 1H); 7.31 J 8.4 Hz. 1H): 2.39 3H).

Example 6 0 or Prepared from the compound 11 CR F) and hydrazine according to General Procedure C. Purification of compound by crystallization in ethanol gives a whit solid (20 vield). mp 355 oC 1 H-NMR (400 MHz. DMSO-d6): 12.7(s. br. 8.42 J=2.OHz. 7.91 (mn. 28): 7.73(dd. J=2.0. 6.8 Hz. 7.41(m.

2H) Example 7 -38-

FN

1 Prepared from the compound 1I (R t-Bu) and hydrazine according to General Procedure C.

Puriification of compound by crystallization in ethanol gives a solid (30 vield). mp 380 oC 1

H-NMR

c 5 (400 MHz. DMSO-d6): 8.07 J 2.5 Hz. IH); 7.91 (dd. 7.6. 7.0 HLz. 7.89 J 7.6 Hz. IH): 7.72 0 C dd. I 7.0. 2.0 Hz. 1H): 7.65 (dd. J 9.0. 2.5 Hz. 1H); 7.37 J 9.0 Hz. 1.38 9H) 0 Example 8

NK

o N Prepared from the compound 11 (R NH2) and hydrazine according to General Procedure C.

Purification of compound by crystallization in ethanol gives a yellowish solid (60 vield). mp 300 oC (dec.).

1 H-NMR (400 MHz- DMSO-d6): 5.29-5.31 2H. 1=71.8 Hz). 6.81-6.83 (dd. 1iH J=8.8. 2.4 Hzl. 7.14-7.16 (d.

1H. J=8.8 Hz). 7.26-7.27 1. J=2.2 Hz). 7.63-7.65 (d 1. 1=7.3 Hz). 7.83-7.89 (dd. J=7.5. 15.5 Hz). 7.85 (s.

12.52(s. br. 1H).

Example 9 O N &cC Prepared from the compound 11 (R NO2) and 1.5 equivalent of hdrazine according to General Procedure C. Purification of compound by crystallization in acetic acid gives a yellowish solid (20 ield). mp -39-

M

If 300 oC 'H-N1RI (400 NMHizl DMSO-d6): 7.46-7.49 I. J1=9.2Hz.). 7.75-7.77 IH. J8.lHz), 0 S7.97-8.01 (dd. IN. =8.1 Hz). 8.13-8.15 IR J=7.9 Hz). 8.38-8.42 (dd IN. =9.5 Hz), 9.07-9.08 I. J=2.6 Hz).

Example ci O0 00 Prepared from the amino compound 13 and acetic anhydride according to General Procedure F.

Purification of the compound by crsallization in ethanol to gives a yeclow solid in 80 yicld. mp 350 (C C 10 'H-NMR (400 MHz. DMSO-d6): 2.08 IN). 7.36-7.38 IN. 7.66-7.70 (dd. I. J=2.6. 16.1 Hz). 7.68-7.69 J=2.2 Hz). 7.88-7.91 IH. J8.6 Hz). 7.89 IH), 8.49 (d IR J-2.5 Hz). 10.15 IH NHCO). 12.62 1I).

Example II

H

N 0 Prepared from the amino compound 13 and succinic anhydride according to General Procedure F.

Purification of the compound by crystallization in ethanol to gives a yellow solid in 20 yield. mp 320 OC IH-NMR (400 MHz. DMSO-d6): 2.50-2.60 4H). 7.45-7.47 (d IL 1=8.9 Hz), 7.74-7.77 (dd. Il J=9.2, 2.5 Hz). 7.76-7.79 (dd. IRN J=7.2, 7.96-7.98 (cd. IN J=9.3 Hz), 7.97 IM). 8.56-8.57 IL Hz) 10.29(s. 1K). 12.72 lI).

Example 12 o I Prepared from the compound 14 and cysteamine according to General Procedure E. Purification of compound by crystallization in ethanol gives white solid product in 30 of vield. mp 255 275 oC I 5 (methylsulfonic acid salt). IH-NMR (400 MHz. DMSO-d 6 2.29 3H), 2.64 2K 7.3 Hz), 3.01 (br s.

S2H). 3.92 2H). 7.42 IFL J 8.5 Hz). 7.54- 7.57 (dd. IH J 2.1 Hz. 8.6 Hz). 7.71 -7.76 4 7.89 (C 7.95 2H). 8.0 IL J 2. IHz). 12.69 1I).

0 SExample 13 o

H

ci O

N

Prepared from the compound 14 and 4-mercaptopyridine according to General Procedure E. Purification of compound by crystallization in ethanol gives white solid product in 38 of yield. mp 237 240 OC. lH- NMR (400 MHz. DMSO-d6): 12.68 1H). 8.61 2H). 8.24 1. J 2.2 Hz). 7.92 7.85 4H). 7.70 (m.r 2H). 7.44 I. J 8.5 Hz. 4.70 2H). 2.30 3H).

Example 14 o 02 I N 0 Prepared from the compound 14 and hydrazine according to General Procedure D. Purification of compound by crystallization in acetic acid gives a yellow solid product in 78 ofyield. Mp 300 oC. IH-NMR -41- (400 MHz. DMSO-d 6 12.64 (s br. IH). 8.04 J 2 Hz lH), 7.93-7.88 2H), 7.71 (dd. J 1.9 Hz and 0 7.3 Hz. 7.51 (dd. 1 2.1 Hz and 85 Hz. IH). 7.37 J 8.4 Hz 3.82 2H).

ci Example

N

:N

Prepared from the compound 14 and potassium cyanide according to General Procedure D. Purification O of compound hr crvsallizazion in acetic acid gives a light yellow solid product in 70% of yield mp 300 0

C.

1H-NMR (400 MHz. DMSO-d0): 12.70 1. NM. 8.10 2.0 Hz. IH). 7.91 2H). 7.72 (dd. 1.8.

7.2 Hz. 1I). 7.53 (dd. 1= 2.2. 8.6 Hz. IH). 7.46 J 8.6 Hz. 4.18 2H).

Example 16 a I4, I I

N.

Prepared from the compound 14 and 1-phenylpiperazine according to General Procedure D.

Purification of compound by crystallization in ethanol gives a white solid product in 89 of yield. mnp >.300 OC 9 1 H-NMR (400 MHz. DMSO-d6): 12.63 br. 1H). 8.06 J 1.9 Hz. 7.90 (mn. 2H), 7.72 (dd. J= 7.1 and 1.9 Hz. IH), 7.53 (dd. J 8.5 and 2.0 Hz. 1H). 7.40 J 8.5. 1I), 7.19 6.92 J 8.0 Hz.

2H). 6.76 (L I1= 7.3 Hz. IH). 3.61 2H). 3.14 (t J 4.3 Hz.2H), 2.56 (tL J 4.2 Hz, 2H).

Example 17 42 In Prepared from the compound 14 and 1-(2-pyridyl)piperazinc according to General Procedure D.

Purification of compound by crystallization in ethanol gives a white solid product in 89 of yield. mp 300 °C O\ 1 H-NMR (400 MHz. DMSO-d6): 12.64 br. 1H). 8.09 2H). 7.90 2H), 7.71 (dd. J 7.2 and 1.8 S 5 Hz. IH). 7.52 2H). 7.40 J 8.5 Hz. 1H). 6.80 J 8.6 Hz. 1H). 6.62 1H). 3.60 2H), 3.49 (s.

4H). 3.30 4H).

O Example 18 to

N

Prepared from the compound 14 and piperidine according to General Procedure D. Purification of compound by crystallization in ethanol gives a white solid product in 69 of yield. mp 195 200 oC. 1

H-NMR

(400 MH-z. DMSO-d6): 1.30 1.45 (m.1 HD) 1.53 1.75 3H). 1.75 1.90 2H). 2.35 3H), 2.82 3.0 (2 3.30 3.4 21), 4.39 2 J 1 5.2 Hz). 7.51 1. J 8.5 Hz). 7.65 7.68 (dd. 1IK J 2.1 Hz. Hz). 7.74 7.76 1H), 7.91 -7.96 2H). 8.29 I. J 2.1 Hz). 9.33 (bs. 1H). 12.79 1H).

Example 19 "N M c, Prepared from the compound 14 and N-methylbutylamine according to General Procedure D.

Purification of compound by crystallization in ethanol gives a white solid product in 69 of yield. mp 133 -135 oC. IH-NMR (400 MHz. DMSO-d6): 0.91 (L 3H. J 7.4 Hz). 1.29 1.34 2H), 1.65 1.70 2H). 2.35 (s.

-43- 3H). 2.69 3H. 1 4.8 Hz). 3.03 3,05 (mo. IH). 3.14 IH). 7.53 IL J 8.5 Hz). 7.67 -7.69 (dd. 1H. I S 2.0 Hz. 8.5 Hz). 7.73 7.76 IH), 7.91 7.96 2M). 8.30 11. J 2.0 Hz), 9.50 IH). 12.79 IH).

Prepared from the compound 14 and N-dimethylamine according to General Procedure D. Purification of compound by crystallization in ethanol gives a white solid product in 70 of vicid. IH-NMR (400 Mz DMSO-d6): 2.36 3H). 2.78 6HL J 4.8 Hz). 4.40 2H). 7.53 J 8.5 Hz). 7.65 7.70 1I), 7.75 7.92 7.95 2H). 8.28 9.70 fs. IH). 12.78 IH).

Example 21 o Prepared from the compound 14 and N-methylburvlamine according to General Procedure E.

Purification of compound by crystallization in acetic acid gives a gray solid product in 59 of yield. Mp >300 oC IH-NMR (400 M-z. DMSO-d6): 12.67 9.62 Id. =.17 J= 2.0 Hz. 7.90 2H).

7.80 I 8.8 Hz. 2H). 7.72 (dd, J 1.7 and 7.2 Hz. IH), 7.64 (dd, J 2.1 and 8.6 Hz, 1i), 7.45 I Hz. IHf), 7.09 J= 8.8 Hz. 2H). 5.27 2H), 4.42 (br s. 2H).

Example 22 -44-

ONO

Prepared from the compound 14 and 3-dimethylphenol according to General Procedure E. Purification of compound by crystallization in acetic acid gives a light yellow solid product in 50 of vield. mp >300 OC 1H-NMR (400 MHz, DMSO-d6): 12.65 br. IH). 8.16 J 2.0 Hz. 7.91 (m 28). 7.72 (dd. J 7.1 and 2.0 Hz. 7.63 (dd. 86 and z. 7.44 J 8.5 Hz. 1. 7.07 (L 7,5 Hz. 1H) 6.33 (m 3H). 5.17 2H). 2.87 6H).

Example 23 cii -i A 0 0, Prepared from the compound 14 and 4-(1-imidazole)phnol according to General Procedure E.

Purification of compound by crystallization in ethano gives a white solid product in 70 of yiicid. Mp >300 OC IH-NMR (400 MHz. DMSO-d6): 12.66 br. 1H). 8.18 J 2 Hz 7.91 2H). 7.73 (dd J 7.1 and 1.9 Hz. 1K). 7.66 (dd. 3 8.5 and 2.1 Hz. 1H). 7.48 38). 7.25 (L 2.1 Hz. 2H. 7.12 (mn. 2H 6.212 J 2.1 Hz 2H), 5.25 2H) Example 24 o 45 If) Prepared from the compound 14 and 3-hydrox.pyridine according to General Procedure E. Purification 0 0 of compound by crystallization in ethanol gives a yellow solid product in 57 of yield. Mp >300 C 'H- NMR (400 MHz. DMSO-d6): 12.67 br. IH). 8.39 J 2.9 Hz. 8.19 2.8 Hz. 2H), 7.91 2H).

;Z 7.72 (dd. J 7.1 and 2.0 Hz. 1H). 7.66 (dd. J 8.5 and 2.2 Hz. H1), 7.49 2H). 7.35 IH). 5.30 2H).

Example ci o 0 0 S 10 Prepared from the compound 11 (R H) and 1.5 equivalent of hydrazine to give benzopvrano(4.3.2delphthalazine according to General Procedure C. To a solution of 0.3g of benzopyrano[4.3.2-de]phthalazine in mL of concentrate sulfuric acid is dropwise added 2.0 mL of fuming sulfuric acid at 0 oC. The mixture is stirred for 3 hours at 0 oC and poured into 100 mL of ice-cold amer. The precipitation is collected by filtration.

washed with water to give of a white solid product mp >300 oC IH-NMR (400 MHz. DMSO-d6): 12.7 I H) 8.35 I 7.92 7.90 2 7.76 -7.71 2 7.38 1 H).

Example 26

H

N

crn Prepared from the compound 16 and N-(2-aminoethyl)morpholine according to General Procedure B.

Purification of compound by silica gel column chromatography provides sulfonamide 17. Condensation of compound 17 with hydrazine according to General Procedure C in ethanol affords a solid which is purified by crystallization in ethanol gives a white solid product in 70 of yield. To this amine compound (10 mmol) in dioxane (10 mL) is added 10 mmol ofhydrochloric acid in dioxane at 60 oC. White salt solid product is formed upon cooling the solution to room temperature. The solid is collected by filtration. mp 302 307 oC. 1

H-NMR

(400 MHz. DMSO-d 6 12.81 IH). 10.90 IH). 8.49 IH. 2.3 Hz). 8.30 IH), 7.99 -7.92 3H). 7.78 -46- O -77.75 (dd. H1. 2.6 Hz, 6.5 Hz). 7.65 1H. 8.8 Hz). 3.95 3.92 2H), 3.78 3.72 (L 21-. 11.8 Hz). 3.43 C' 3.39 2HL. 3.33 4H). 3.10 3.08 2H).

Example 27

H

CPrepared from the compound 16 and l.(2-aminoethyl)piperidine according to General Procedure B.

O Purification of compound by silica gel column chromatography provides sulfonamide 17. Condensation of 0 compound 17 with hydrazine according to General Procedure C in ethanol-water affords a solid which is purified by crystallization in ethanol gives a white solid product in 50 of vield. To this amine compound mmol) in dioxane (10 mL) is added 11 mmol of hydrochloric acid in dioxane at 60 oC. White solid product is formed upon cooling the solution to room temperature and collected by filtration. mp 300 oC IH-NMR (400 MHz. DMSO-d6): 12.82 1H). 9.80 1H). 8.49 fd. IH. 2.4 Hz). 8.26 1H), 7.96-7.94 3 7.78 (dd. 18. 2.6 Hz. 6.5 Hz). 7.67 IH- 8.8 Hz). 3.20-3.17 2H). 3.13-3.12 2H). 2.89-2.87 2H). 1.75- 1.68 6H). 1.45-1.30 2H).

Example 28 l il i i

CHI

Prepared from the compound 16 and N.methylpiperazine according to General Procedure B.

Purification of compound by silica gel column chromatography provides sulfonamide 17. Condensation of compound 17 with hydrazine according to General Procedure C in ethanol affords a solid which is purified by crystallization in ethanol gives a white solid product in 45 of yield. Mp 300 OC IH-NMR (400 MHz.

DMSO-d6): 12.82 1H), 10.55 1H). 8.36 1. 2.3 Hz), 7.96 7.91 3H). 7.79 (dd, 1I- 2.7 Hz. Hz). 7.71 18. 8.7 Hz). 3.90 3.80 (bs. 2H). 3.50 3.40 (bs. 2H). 3.20 3.10 (bs. 2H). 2.85 2.70 -47

O

O

c Example 2 9 n )I a 0 o o m SPrepared from the compound 16 and L-proline according to General Procedure B. Purification of ci 5 compound by silica gel column chromatography provides sulfonamide 17. The compound 17 is reacted with O hvdrazine according to General Procedure C in ethanol affords a solid which is purified by crysallization in Sethanol gives a white solid product in 29 of yield mp 300 (dec.) 1 H-NMR (400 MHz. DMSO-d6): o 12.78 1H). 8.41 1H J 2.3 Hz). 7.99 7.92 31). 7.79 (dd. IH. J 5.6 Hz. 8.2 Hz). 7.63 IH. J 8.7 Hz). 4.14 (rn. 1H). 3.41 3.32 (m 1.99 1.90 1H). 1.90 1.33 2H), 1.68 1.63 1H).

Example o

N

0 0 P-0 on o To a solution of compound 14 in m-.xylen is added riethyl phosphite the mixture is reflu.xed for 2 hours and cooled to room temperature. The precipitation is collected by filtration to give phosphonic eser.

Condensation of this compound with hydrazine according to General Procedure C in ethanol affords a solid which is purified by crystallization in ethanol gives a white solid product in 70 of yield. Mp 196 -201 OC.

LRMS (fab. M+l) 345. IH-NMR (400 MHz DMSO-d6): 7.36 7.8 Hz. 1H), 7.23 J 7.6 Hz. 1i).

7.08 7.7 Hz. 1H), 6.99 1H). 6.78 J 8.0 Hz. 1H). 6.54 J 8.4 Hz. 18), 3.53 J 10.4 Hz. 3H).

2.82 J= 20.1 H. 2H).

Example 31 48 0, N.

C 1 NH Prepared from the compound 11 R COOMe) and hydrazine according to General Procedure C.

Purification of compound bv crystallization in acetonitrile gives a whir solid (40 yield). mp 400 oC (dec.).

S 5 IH-NMR (400 MHz. DMSO-d6): 12.73 br. 1I): 9.99 IH): 8.57 J= 2.0 Hz. 1H). 7.98 (dd. J= 5.5. 2.2 C Hz. IH)- 7.92 2H); 7.33 (dd. 6.5. 2.6 Hz. IH): 7.47(d. J 8.7 Hz. lH): 4.55 2H).

Other variations and modifications of this invention using the synthetic pathways described above will 0 be obvious to those skilled in the art.

Methods of Using the Compounds of the Invention The compounds of the present invention can treat or prevent tissue damage resulting from cell damage or death due to necrosis or apoptosis: can ameliorate neural or cardiovascular tissue damage, including that following focal ischemia. myocardial infaration. and reperfusion injury: can treat various diseases and conditions caused or exacerbated by PARP activity: can extend or increase the lifespan or proliferative capaciry of cells: can alter the gene expression of senescent cells: and can radiosensitize cells. Generally, inhibition of PARP activiy spares the cells from energy loss. prevenung, in the case of neural cells, irreversible depolarization of the neurons. and thus. provides neuroprotection. While not being bound to any one particular theory it is thought that PARP activation may play a common role in still other excitotoxic mechanisms. perhaps as yet undiscovered, in addition to the production of free radicals and NO.

For the foregoing reasons. the present invention further relates to a method of administering a therapeutically effective amount of the abo\ e-identified compounds in an amount sufficient to inhibit PARP activity. to treat or prevent tissue damage resulting from cell damage or death due to necrosis or apoptosis. to effect a neuronal activity not mediated by NMIDA toxicity. to effect a neuronal activity mediated by NMDA toxicity. to treat neural tissue damage resulting from ischemia and reperfusion injury, neurological disorders and neurodegenerative diseases: to prevent or treat vascular stroke: to treat or prevent cardiovascular disorders: to treat other conditions and/or disorders such as age-related muscular degeneration. AIDS and other immune senescence diseases, arthritis, atherosclerosis. cachexia. cancer, degenerative diseases of skeletal muscle involving replicative senescence. diabetes, head trauma, immune senescence, inflammatory bowel disorders (such as colitis and Crohn's disease), muscular dystrophy. osteoarthritis. osteoporosis. chronic and/or acute pain (such as neuropathic pain), renal failure. retinal ischemia. septic shock (such as endotoxic shock). and skin aging: to extend the lifespan and proliferative capacity of cells: to alter gene expression of senescent cells: or to 49

O

O radiosensitize hypoxic tumor cells. The present invention also relates to treating diseases and conditions in an animal which comprises administering to said animal a therapeutically effective amount of the above-identified compounds.

In particular, the present invention relates to a method of treating. preventing or inhibiting a neurological disorder in an animal, which comprises administering to said animal a therapeutically effective amount of the above-idenified compounds. In a particularly preferred embodiment, the neurological disorder is C selected from the group consisting of peripheral neuropathy caused by physical injury or disease state. traumatic t brain injury, physical damage to the spinal cord. stroke associated with brain damage. focal ischemia. global ischemia. reperfusion injury. demyelinating disease and neurological disorder relating to neurodegeneration.

C 10 Another preferred embodiment is when the reperfusion injury is a vascular stroke. Yet another preferred 0 embodiment is when the peripheral neuropathy is caused by Guillain-Barre syndrome. Still another preferred 2, embodiment is when the demyelinating disease and neurological disorder relates to neurodegeneration. Another preferred embodiment is when the reperfusion injury is a vascular stroke. Still another preferred embodiment is when the demyelinating disease is multiple sclerosis. Another preferred embodiment is when the neurological disorder relating to neurodegeneration is selected from the group consisting of Alzheimer's Disease. Parkinson's Disease. and amyotrophic lateral sclerosis.

Yet another preferred embodiment is a method of treating. preventing or inhibiting a cardiovascular disease in an animal, such as angina pectoris. myocardial infarcion. cardiovascular ischemia. and cardiovascular tissue damage related to PARP activation, by administering to said animal an effective amount of the compounds of the present invention.

The present invention also contemplates the use of compound I. 11. III. IV or V for inhibiting PARP activity. for treating. preventing or inhibiting tissue damage resulting from cell damage or death due to necrosis or apoptosis. for treating. preventing or inhibiting a neurological disorder in an animal.

In a particularly preferred embodiment, the neurological disorder is selected from the group consisting of peripheral neuropathy caused by physical injury or disease state. traumatic brain injury. physical damage to the spinal cord. stroke associated with brain damage. focal ischemia. global ischemia. reperfusion injury.

demyclinating disease and neurological disorder relating to neurodegeneration.

Another preferred embodiment is when the reperfusion injury is a vascular stroke. Yet another preferred embodiment is when the peripheral neuropathy is caused by Guillain-Barre syndrome. Still another preferred embodiment is when the demyelinating disease is multiple sclerosis. Another preferred embodiment is when the neurological disorder relating to neurodegeneration is selected from the group consisting of Alzhetmer's Disease. Parkinson's Disease. and amyotrophic lateral sclerosis.

The present invention also contemplates the use of compound I. H. I, IV or V in the preparation of a medicament for the treatment of any of the diseases and disorders in an animal described herein.

In a particular embodiment, the disease or disorder is a neurological disorder.

O In a parcularly preferred embodiment, the neurological disorder is selected from the group consisting (N of peripheral neuropathy caused by physical injury or disease state. traumatic brain injury, physical damage to F the spinal cord. stroke associated with brain damage. focal ischemia, global ischemia. repcrfusion injury.

demyelinating disease and neurological disorder relating to neurodegeneration. Another preferred embodiment is when the reperfusion injury is a vascular stroke. Yet another preferred embodiment is when the peripheral neuropathy is caused by Guillain-Barre syndrome.

Still another preferred embodiment is when the demyclinaing disease is multiple sclerosis. Another preferred embodiment is when the neurological disorder relating to neurodegeneration is selected from the group l C consisting of Alzheimers Disease. Parkinson's Disease. and amyotrophic lateral sclerosis.

o 1 The term "preventing neurodegeneration" includes the ability to prevent neurodegeneration in patients Snewly diagnosed as having a neurodegenerative disease, or at rsk of developing a new degenerative disease and O for preventing further neurodegeneration in patients who are already suffering from or have symptoms of a c neurodegenerative disease.

The term "treatment" as used herein covers any treatment of a disease and/or condition in an animal.

particularly a human, and includes: preventing a disease and/or condition from occurring in a subject which may be predisposed to the disease and/or condition but has nor yet been diagnosed as having it: (ii) inhibiting the disease and/or condition, arresting its development: or (iii) relieving the disease and/or condition. causing regression of the disease and/or condition.

As used herein, the term "neural tissue damage resulting from ischemia and reperfusion injury" includes neurotoxicitv., such as seen in vascular stroke and global and focal ischemia. As used herein. the term "neurodegenerative diseases." includes Alzheimer's disease. Parkinson's disease and Huntington's disease.

The term "ischemia" relates to localized tissue anemia due to obstruction of the inflow of arterial blood.

Global ischemia occurs under conditions in which blood flow to the entire brain ceases for a period of time. such as may result from cardiac arrest. Focal ischemia occurs under conditions in which a portion of the brain is deprived of its normal blood supply, such as may result from thromboembolytic occlusion of a cerebral vessel.

traumatic head injury. edema. and brain rumors.

The term "cardiovascular disease" relates to myocardial infarction. angina pectoris. vascular or myocardial ischemia, and related conditions as would be known by those of skill in the art which involve dysfunction of or tissue damage to the heart or vascularure. and especially. but not limited to. tissue damage related to PARP activation.

The term "radiosensitizer". as used herein, is defined as a molecule, preferably a low molecular weight molecule. administered to animals in therapeutically effective amounts to increase the sensitivity of the cells to be radiosensitized to electromagnetic radiation and/or to promote the treatment of diseases which are treatable with electromagnetic radiation. Diseases which are ru-atable with electromagnetic radiation include neoplastic diseases. benign and malignant rumors and cancerous cells. Electromagnetic radiation treatment of other o diseases not listed herein are also contemplated by the present invention. The terms "electromagnetic radiationand "radiation" as used herein includes, but is not limited to. radiation having the wavelength of 10" to 100 Smeters. Preferred embodiments of the present invention employ the electromagnetic radiation of: gammaradiation (10. 0 to 10 m) x-ray radiation to 10" ultraviolet light (10 nm to 400 nm). visible light t n 5 (400 nm to 700 nm). infrared radiation (700 nm to 1.0 mm). or microwave radiation (1 mm to 30 cm).

Compositions and Methods for Effecting Neuronal Activity Preferably. the compounds of the invention inhibit PARP activity and. thus. are believed to be useful for treating neural tissue damage, particularly damage resulting from cerebral ischemia and reperfusion injury or 10 neurodegenerative diseases in animals. The term "nervous tissue" refers to the various components that make up Sthe nervous system including. without limitation. neurons. neural support cells. glia. Schwann cells. vasculature Scontained within and supplying these structures, the central nervous system. the brain, the brain stem. the spinal Scord. the junction of the central nervous system with the peripheral nervous system. the peripheral nervous system. and allied structures.

Further. according to the invention, an effective therapeutic amount of the compounds and compositions described above are administered to animals to effect a neuronal activity, particularly one that is not mediated by NMDA neurotoxicivy. Such neuronal activity may consist of stimulation of damaged neurons, promotion of neuronal regenerationr prevention of neurodegencrauon and treatment of a neurological disorder. Accordingly.

the present invention further relates to a method of effecting a neuronal activity in an animal, comprising administering an effective amount of the compound of formula 1. 11 III. IV or V to said animal.

Examples of neurological disorders that are treatable by the method of using the present invention incluce. ithout limitation, trigeminal neuralgia: glossopharygeal neuralgia: Bell's Pais y myasthenia gravis: muscular dystrophy: amyotrophic lateral sclerosis: progressive muscular atrophy: progressive bulbar inherited muscular atrophy. herniated, ruptured or prolapsed invertebrate disk syndromes: cervical spondvlosis: plexus disorders: thoracic outlet destruction syndromes: peripheral neuropathies such as those caused by lead. dapsone.

ticks. porphyria. or Guillain-Barre syndrome: Alzheimers disease: Huntington's Disease and Parkinson's disease.

The method of the present invention is particularly useful for treating a neurological disorder selected from the group consisting of: peripheral neuropathy caused by physical injury or disease state: head trauma. such as traumatic brain injury: physical damage to the spinal cord: stroke associated with brain damage, such as vascular stroke associated with hypoia and brain damage. focal cerebral ischemia. global cerebral ischemia. and cerebral reperfusion injury: demyelinating diseases. such as multiple sclerosis: and neurological disorders related to neurodegeneration. such as Alzheimer's Disease. Parkinson's Disease. Huntington's Disease and amyotrophic lateral sclerosis (ALS).

Treating Other PARP-Related Disorders 52 The compounds. compositions and methods of the present invention are particularly useful for treating or preventing tissue damage resulting from cell death or damage due to necrosis or apoptosis.

C'l The compounds. compositions and methods of the invention can also be used to treat a cardiovascular disorder in an animal. by administering an effective amount of the compound of formula to the animal. As used S 5. herein, the term "cardiovascular disorders" refers to those disorders that can either cause ischemia or are caused by reperfusion of the heart. Examples include, but are not limited to. coronary artery disease. angina pectoris.

myocardial infarction. cardiovascular tissue damage caused by cardiac arrest. cardiovascular tissue damage caused by cardiac bypass. cardiogenic shock. and related conditions that would be known by those of ordinary skill in the an or which involve dysfunction of or tissue damage to the heart or vasculature. especially, but not limited to. tissue damage related to PARP activation.

O For example, the methods of the invention are believed to be useful for treating cardiac tissue damage.

If particularly damage resulting from cardiac ischemiua or caused by reperfusion injury in animals. The methods of o the invention are particularly useful for treating cardiovascular disorders selected from the group consisting of: Cl coronary anery disease. such as atherosclerosis: angina pectoris: myocardial infarction; myocardial ischemia and cardiac arrest: cardiac bypass: and cardiogenic shock. The methods of the invention are particularly helpful in treating the acute forms of the above cardiovascular disorders.

Further, the methods of the invention can be used to treat tissue damage resulting from cell damage or death due to necrosis or apoptosis. neural tissue damage resulting from ischemia and reperfusion injury.

neurological disorders and neurodegenerative diseases: to prevent or treat vascular stroke: to treat or prevent cardiovascular disorders: to treat other conditions and/or disorders such as age-rclated muscular degeneration.

AIDS and other immune senescence diseases. arthritis, atherosclerosis, cachexia. cancer. degenerative diseases of skeletal mus..e involving replicative senescence. diabetes, head trauma, immune senescence. inflammatory bowel disorders (such as colitis and Crolin's disease, muscular dystrophy, osieoanhntis. osteoporosis. chronic and/or acute pain (such as neuropathic pain), renal failure, retinal ischemia, septic shock (such as endotoxic shock). and skin aging: to extend the lifespan and proliferative capacity of cells: to alter gene expression of senescent cells: or to radiosensitize tumor cells Further still. the methods of the invention can be used to treat cancer and to radiosensitize tumor cells.

The term "cancer" is interpreted broadly. The compounds of the present invention can be "anti-cancer agents".

which term also encompasses "anti-tumor cell growth agents" and "anti-neoplastic agents". For example, the methods of the invention are useful for treating cancers and radiosensitizing tumor cells in cancers such as ACTH-producing tumors, acute lyrnphocytic leukemia. acute nonlymnphocytic leukemia. cancer of the adrenal cortex bladder cancer- brain cancer. breast cancer, cervical cancer. chronic lymphocytic leukemia. chronic myelocytic leukemia. colorectal cancer, cutaneous T-cell lymphoma. endometrial cancer- esophageal cancer.

Ewing's sarcoma. gallbladder cancer. hairy cell leukemia. head neck cancer, Hodgkin's lymphoma. Kaposi's sarcoma. kidney cancer, liver cancer. lung cancer (small and/or non-small cell), malignant peritoneal effusion, malignant pleural effusion, melanoma- mesothelioma. multiple myeloma. ncuroblastomia. non-Hodgkin's 53 Slymphoma. osicosarcoma. ovarian cancer, ovary (germ cell) cancer. prostate cancer, pancreatic cancer, penile 0 cancer. retmoblastoma. skin cancer, soft-tissue sarcoma- squamous cell carcinomas, stomach cancer, testicular C cancer. thyroid cancer, trophoblastic neoplasms. uterine cancer. vaginal cancer. cancer of the vulva and Wilm's g tumor.

a 5 The term "radiosensitizer". as used herein, is defined as a molecule. preferably a low molecular weight C) molecule. administered to animals in therapeutically effective amounts to increase the sensitivity of the cells to be radiosensitized to electromagnetic radiation and/or to promote the treatment of diseases which are treatable with electromagnetic radiation. Diseases which are treatable with electromagnetic radiation include neoplastic 0 diseases, benign and malignant tumors. and cancerous cells. Electromagnetic radiation treatment of other diseases not listed herein are also contemplated by the present invention. The terms "electromagnetic radiation" Sand -radiation" as used herein includes, but is not limited to. radiation having the wavelength of 10"' to 100 l/ meters. Preferred embodiments of the present invention employ the electromagnetic radiation of: gammao radiation (10" to 10" m) x-ray radiation (10" to 10'" ultraviolet light (10 nm to 400 nm). visible light C"l (400 nm to 700 nm). infrared radiation (700 nm to 1.0 mm). and microwave radiation (I mm to 30 cm).

Radiosensitizers are known to increase the sensitiviy of cancerous cells to the toxic effects of electromagnetic radiation. Several mechanisms for the mode of action of radiosensitizers have been suggested in the literature including: hypoxic ceil radiosensitizers 2-nitroimidazole compounds. and benzotriazine dioxide compounds) promote the reoxygenauon of hypoxic tissue and/or catalyze the generation of damaging oxygen radicals: non-hypoxic cell radiosensitizers halogenated pyrimidines) can be analogs of DNA bases and preferentially incorporate into the DNA of cancer cells and thereby promote the radiation-induced breaking ofDNA molecules and/or prevent the normal DNA repair mechanisms: and various other potential mechanisms of action have been hypothesized for radiosensiuzers in the treatment of disease.

Many cancer treatment protocols currently employ radiosensitizers activated by the electromagnetic radiation of x-rays. Examples of x-ray activated radiosensitizers include, but are not limited to. the following: metronidazoie. misonidazole. desmethylmisonidazole. pimonidazole. etanidazole. nimorazole. mitomvcin C.

RSLU 1069. SR 4233. E09. RB 6145. nicounamide. 5-bromodeoxyuridine (BUdR). 5-iododeoxyuridine (IUdR).

bromodeoxvcvtidine. fluorodeoxyuridine (FudR). hydroxyurea, cispiatin. and therapeutically effective analogs and derivatives of the same.

Photodynamic therapy (PDT) of cancers employs visible light as the radiation activator of the sensitizing agent. Examples of photodynamic radioscnsiizers include the following, but are not limited to: hematoporphvrin derivatives. Photofrin. benzoporphyrin derivatives. NPe6. tin etioporphTrin SnET2.

pheoborbide-a. bacteriochlorophyll-a. naphthalocyanines. phthalocyanines. zinc phthalocyanine. and therapeutically effective analogs and derivatives of the same.

Radiosensitizers may be administered in conjunction with a therapeutically effective amount of one or more other compounds, including but not limited to: compounds which promote the incorporation of radiosensitizers to the target cells: compounds which control the flow of therapeutics. nutrients, and/or oxygen to 54 l o the target cells: chemotherapeutic agents which act on the tumor with or without additional radiation: or other 0 therapeutically effective compounds for treaing cancer or other disease. Examples of additional therapeutic agents that may be used in conjunction with radiosensitizers include. but are not limited to: leucovorin. 5' -amino-5'deoNxthymidinc. oxygen. carbogen. red cell transfusions- perfluorocarbons Fluosol- DA). 2.3-DPG. BWI2C. calcium channel blockers. pentoxyfvllinc. antiangiogenesis compounds, hydralazine.

Sand LBSO. Examples of chemotherapcutic agents that may be used in conjunction with radiosensiuzers include.

but are not limited to: adriamycin. camptothecin. carboplatin. cisplatin. daunorubicin. doceraxel. doxorubicin.

C-I interferon (alpha. beta. gamma). interleukin 2. irinotecan. pacliaxel. topotecan, and therapeutcally effective 0\ 4t analogs and derivatives of the same.

Pharmaceutical Compositions of the Invention SThe present invention also relates to a pharmaceutical composition comprising a therapeutically Seffective amount of the compound of formula L II. III. IV or V and (ii) a pharmaceutically acceptable carrier.

The above discussion relating to the preferred embodiments' utility and administrauon of the compounds of the present invention also applies to the pharmaceutical composition of the present invention.

The term "pharmaceutically acceptable carrier" as used herein refers to any carrier diluent. excipient.

suspending agent. lubricating agent, adjuvant. vehicle, delivery system. emulsifier. disintegrant. absorbent.

preservative, surfactant. colorant. flavoramn or sweetener.

For these purposes, the composition of the invention may be administered orally, parenterally. by inhalation spray. adsorption, absorption, topically. rectally. nasally. bucally. vaginally, intaventricularly. via an implanted reservoir in dosage formulations containing conventional non-toxic pharmaceutically-acceptable carriers, or by any other convenient dosage form. The term parenteral as used herein includes subcutaneous.

intravenous. intramuscular. intraperitone.di intrathecal. inmrventricular. intrasternal. and intracranial injection or infusion techniques.

When administered parenterally. the composition will normally be in a unit dosage. sterile injectable form tsolution. suspension or emulsion) which is preferably isotonic with the blood of the recipient with a pharmaceutically acceptable carrier. Examples of such sterile injectable forms are sterile injectable aqueous or oleaginous suspensions. These suspensions may be formulated according to techniques known in the art using suitable dispersing or wetting agents and suspending agents. The sterile injectable forms may also be sterile injectable solutions or suspensions in non-roxic parenterally-acceptabic diluents or solvents, for example, as solutions in L3-butanediol. Among the acceptable vehicles and solvents that may be employed are water. saline.

Ringer's solution, dextrose solution. isotonic sodium chloride solution. and Hanks' solution. In addition, sterile.

fixed oils are conventionally employed as solvents or suspending mediums. For this purpose, any bland fixed oil may be employed including synthetic mono- or di-glycerides. corn. cottonseed, peanut and sesame oil. Faty acids such as ethyl oleate. isopropyl myristate. and oleic acid and its glyceride derivatives, including olive oil tI and castor oil. especially in their polyoxyethylated versions. are useful in the preparation of injectablcs. These Soil solutions or suspensions may also contain long-chain alcohol diluents or dispersants.

Sterile saline is a preferred carrier, and the compounds are often suficientlv water soluble to be made up as a solution for all foreseeable needs. The carrier may contain minor amounts of additives, such as substances that enhance solubilitv. isotanicitv. and chemical stability. anti-oxidants buffers and preservatives.

Formulations suitable for nasal or buccal administration (such as self-propelling powder dispensing formulations) may comprise about 0. 1% to about 5% w/w. for example 1% w/w of active ingredient. The formulations for human medical use of the presen invention comprise an active ingredient in association with a C" 10 pharmaceutically acceptable carrier therefore and optionally other therapeutic ingredient(s).

When administered orally. the composition will usually be formulated into unit dosage forms such as tablets, cachets. powder. granules. beads. chewable lozenges, capsules. liquids, aqueous suspensions or solutions.

O or similar dosage forms. using conventional equipment and techniques known in the an. Such formulations C(l -typcally include a solid, semisolid. or liquid earner. Exemplary carriers include lactose. dextrose. sucrose.

sorbitol. mannitol. starches, gum acacia, calcium phosphate. mineral oil. cocoa buner. oil of theobroma.

alginates. tragacanth. gelatin. syrup. methyl cellulose. polyoxyethylene sorbitan monolaurate. methyl hydroxybenzoate. propyl hydroxvbenzoate. talc. magnesium stearate. and the like.

The composition of the invention is preferably administered as a capsule or tablet containing a single or divided dose of the inhibitor. Preferably. the composition is administered as a sterile solution- suspension, or emulsion, in a single or divided dose. Tablets may contain carriers such as lactose and corn starch, and/or lubricating agents such as magnesium stearate. Capsules may contain diluents including lactose and dried corn starch.

A tablet may be made by compressing or molding the active ingredient optionally with one or more accessory ingredients. Compressed tablets may be prepared by compressing. in a suitable machine, the active ingredient in a free-flowing form such as a powder or granules. optionally mixed with a binder, lubricant, inert diluent. surface active, or dispersing agent. Molded tablets may be made by molding in a suitable machine, a mixture of the powdered active ingredient and a suitable carrier moistened with an inert liquid diluent The compounds of this invention may also be administered rectally in the form of suppositories. These compositions can be prepared by mixing the drug with a suitable non-irritating excipient which is solid at room temperature, but liquid at rectal temperature. and. therefore. will melt in the recnum to release the drug. Such materials include cocoa butter, beeswax. and polyethylene glycols.

Compositions and methods of the invention also may utilize controlled release technology. Thus. for example. the inventive compounds may be incorporated into a hydrophobic polymer matrix for controlled release over a period of days. The composition of the invention may then be molded into a solid implant, or externally applied patch, suitable for providing efficacious concentrations of the PARP inhibitors over a prolonged period of time without the need for frequent re-dosing. Such controlled release films are well known to the an.

56 I Particularly preferred are transdermal delivery systems. Other examples of polymers commonly employed for 0 this purpose that may be used in the present invention include nondegradable ethylene-vinyl acetate copolymer CN an degradable lactic acid-glycolic acid copolymers which may be used externally or internally. Certain F1hydrogels such as poly(hydroxyyethylmethacrylate) or poly(vinylaicohol) also may be useful, but for shorter release cycles than the other polymer release systems. such as those mentioned above.

I) In a preferred embodiment, the carrier is a solid biodegradable polymer or mixture of biodegradable polymers with appropriate time release characteristics and release kinetics. The composition of the invention may then be molded into a solid implant suitable for providing efficacious concentrations of the compounds of Sthe invention over a prolonged period of time without the need for frequent re-dosing. The composition of the present invention can be incorporated into the biodegradable polymer or polymer mixture in any suitable manner O known to one of ordinary skill in the an and may form a homogeneous matrix with the biodegradable polymer.

i or may be encapsulated in some way within the polymer. or may be molded into a solid implant.

O In one embodiment, the biodegradable polymer or polymer mixture is used to form a soft "depot" containing the pharmaceutical composition of the present invenuon that can be administered as a flowable liquid, for example, by injection, but which remains sufficiently viscous to maintain the pharmaceutical composition within the localized area around the injection site. The degradation lime of the depot so formed can be varied from several days to a few years. depending upon the polymer selected and its molecular weight. By using a polymer composition in injectable form. even the need to make an incision may be eliminated. In any event, a flexible or flowable delivery "depot" will adjust to the shape of the space it occupies with the body with a minimum of trauma to surrounding tissues. The pharmaceutical composition of the present invention is used in amounts that are therapeutically effective, and may depend upon the desired release profile, the concentration of the pharmaceutical composition required for the sensitizing effect. and the length of time that the pharmaceutical composition has to be released for treatment.

The PARP inhibitors are used in the composition in amounts that are therapeutically effective. The compositions may be sterilized and/or contain adjuvants, such as preserving, stabilizing. welling, or emulsifying agents. solution promoters. salts for regulating the osmotic pressure, and/or buffers. In addition, they may also contain other therapeutically valuable substances. The compositions are prepared according to conventional mixing. granulating. or coating methods, and contain about 0.1 to 75% by weight, preferably about I to 50% by weight of the active ingredient.

To be effective therapeutically as central nervous system targets. the compounds of the present invention should readily penetrate the blood-brain barrier when peripherally administered. Compounds which cannot penetrate the blood-brain barrier can be effectively administered by an intraventricular route or other appropriate delivery system suitable for administration to the brain.

Doses of the compounds preferably include pharmaceutical dosage units comprising an efficacious quantity of active compound. By an efficacious quantity is meant a quantity sufficient to inhibit PARP and derive its beneficial effects through administration of one or more of the pharmaceutical dosage units.

Preferably. the dose is sufficient to prevent or reduce the effects of vascular stroke or other neurodegenerative diseases.

Cl For medical use. the amount required of the active ingredient to achieve a therapeutic effect will vary d with the particular compound. the route of administration, the mammal under treatment and the particular disorder or disease being treated. A suitable systematic dose of a compound of the present invention or a T pharmacologically acceptable salt thereof for a mammal suffering from. or likely to suffer from. anv of condition as described hereinbefore is in the range of about 0. 1 m/kg to about 100 mg/kg of the active ingredient compound. the most preferred dosage being about I to about 10 mg/kg.

SIt is understood. however, that a specific dose level for any particular patient will depend upon a variety S 10 of factors including the activity of the specific compound employed, the age. body weight, general health, sex.

Sdiet time of administration, rate of excretion, drug combination, and the severity of the particular disease being treated and form of administration.

SIt is understood that the ordinarily skilled physician or veterinarian will readily determine and prescribe l the effective amount of the compound for prophylactic or therapeutic treatment of the condition for which treatment is administered. In so proceeding. the physiczan or veterinarian could employ an intravenous bolus followed by an intravenous infusion and repeated administrauons. parenterallv or orally. as considered appropriate. While it is possible for an actve ingredient to be.administered alone, it is preferable to present it as a formulation.

When preparing dosage form incorporating the compositions of the invention, the compounds may also be blended with conventional excipients such as binders, including gelatin, pregelatinized starch, and the like: lubricants, such as hydrogenated vegetable oil. steanc acid. and the like: diluents. such as lactose, mannose. and sucrose: disintegrants. such as carbo- methylcellulose and sodium starch glycoiate: suspending agents. such as povidone. polyvinyl alcohol, and the like: absorbants. such as silicon dioxide: preservatives, such as methylparaben. propylparaben. and sodium benzoate: surfactants. such as sodium laurvl sulfate. polysorbate and the like: colorants such as C. dyes and lakes: flavorants: and sweeteners.

The present invention relates to the use of compounds I. II. III. IV or V in the preparation of a medicament for the treatment of any disease or disorder in an animal described herein.

PARP Assays

ICS,

A convenient method to determine ICs. of a PARP inhibitor compound is a PARP assay using purified recombinant human PARP from Trevigan (Gaithersburg. MD). as follows: The PARP enzyme assay is set up on ice in a volume of 100 microliters consisting of 100 mM Tns-HCI (pH I mM MgCl 2 28 mM KCL. 28 mM NaCl. 0.1 mg/ml of DNase I activated herring sperm DNA (Sigma. MO). 3.0 micromolar 3 H]nicotinamide adenine dinucleotide (470 mci/mmole). 7 micrograms/ml PARP enzyme, and various concentrations of the compounds to be tested. The reaction is initiated by incubating the mixture at 25fC. After 15 minutes of -58incubation, the reaction is terminated by adding 500 microliters of ice cold 20% richloroacetic acid. The precipitate formed is transferred onto a glass fiber filter (Packard Unifilter-GFiB) and washed three times with ethanol. After the filter is dried, the radioactivity is determined by scintillation counting. The compounds of this invention were found to have potent enzymatic act-ity in the range of a few nM to 20 pM in IC. in this inhibition assay.

Using the PARP assay described above, approximate ICw values were obtained for the following compounds: Compound ICsa Compound IC 0

S

(gM) H H o0 N 0.0131 o NN 0.069 H H NN 0 (tiethylamine salt) H 0.036 H 0.052 o N a N 0 N NN O

CM

3

OH

0 0.192 o K 0.081 0 r H 0208 o o 0.040 o"J s OH N

I

O

(sodium salt) -59-

-61- 62 -63kn 0 Compound ICs. (pM) Compound ICso So o 0 .158 0 0.059 H

OH

Coo 0O 0 0.185 N 0.037 CD o 0 o =0.085 0.08 o ON 0 0.0 6 5 H 0.023 0 O on Co -0.075

N

Focal cerebral ischemia The following focal cerebral ischemia assay is useful for determining the PARP inhibiting effects of the compounds of the present invention. The following examples demonstrate that compunds related to those of the present invention are effective in inhibiting PARP activity.

Focal cerebral ischemia is produced by cauterization of the right distal MCA (middle cerebral artery) with bilateral temporary common carotid arter occlusion in male Long-Evans rats for 90 minutes. All procedures performed on the animals are approved by the University Institutional Animal Care and Use Committee of the University of Pennsylvania. A total of 42 rats (weights: 230-340 g) obtained from Charles n River were used in this study. The animals fasted overnight with free access to water prior to the surgical Sprocedure.

l Two hours prior to MCA occlusion. varying amounts (control. n= 14; 5 mg/kg. n=7: 10 mg/kg. n=7: mg/kg n=7: and 40 mg/kg n=7) of the compound. 3.4-dihydro-5-[4- l-piperidinyl)-butox-j-l(2H)n 5 isoquinolinone were dissolved in dimethyl sulfoxide (DMSO) using a somcator. A volume of 1.28 ml/kg of the resulting solution was injected intraperitoneally into fourteen rats.

The rats were then anesthetized with halothane for induction and for the surgical procedure) in a mixture of 70% nitrous oxide and 30% oxygen. The body temperature was monitored by a rectal probe and maintained at 37.5 0.5"C with a heating blanket regulated by a homeothermic blanket control unit (Harvard Apparatus Limited. Kent. A catheter (PE-50) was placed into the tail anery, and arterial O pressure was continuously monitored and recorded on a Grass polygraph recorder (Model 7D. Grass Instruments. Quincv. Massachusetts). Samples for blood gas analysis (anenal pH. PaCO and PaCO 1 were also o taken from the tail artery catheter and measured with a blood gas analyzer (ABL 30. Radiometer. Copenhagen.

C" Denmark). Arterial blood samples were obtained 30 minutes after MCA occlusion The head of the animal was positioned in a sereotaxic frame, and a right panetal incision between the right lateral canthus and the external auditory meatus was made. Using a dental drill consantly cooled with saline, a 3 mm burr hole was prepared over the corte supplied by the nght MCA. 4 mm lateral to the sagital suture and 5 mm caudal to the coronal suture. The dura mater and a thin inner bone layer were kept. care being taken to position the probe over a tissue area devoid of large blood vessels. The flow probe (tip diameter of I mm. fiber separation of 0.25 mml was lowered to the bottom of the cranial burr hole using a micromanipulator.

The probe was held stationary by a probe holder secured to the skull with dental cement. The microvascular blood flow in the right parietal conest was continuously monitored with a laser Doppler flowmeter (FloLab.

Moor. Devon. and Periflux 4001. Perimed. Stockholm. Sweden).

Focal cerebral ischemia was produced by caurerization of the distal portion of the right MCA with bilateral temporary common carotid artery (CCA) occlusion by the procedure of Chen et al.. "A Model of Focal Ischemic Stroke in the Rat: Reproducible Extensive Cortical Infarction", Stroke 17:738-43 (1986) and/or Liu et al.. "Polyethylene Glycol-conjugated Superoxide Dismumse and Catalase Reduce Ischemic Brain Injurv". Am. 1.

Physiol. 256:H589-93 (1989). both of which are hereby incorporated by reference.

Specifically. bilateral CCA's were isolated. and loops made from polyethylene (PE-10) catheter were carefully passed around the CCA's for later remote occlusion. The incision made previously for placement of the laser doppler probe was extended to allow observation of the rostral end of the zygomatic arch at the fusion point using a dental drill, and the dur mater overlying the MCA was cut. The MCA distal to its crossing with the inferior cerebral vein was lifted by a fine stainless steel hook attached to a micromanipulator and. following bilateral CCA occlusion, the MCA was cauterized with an electrocoagulator. The burr hole was covered with a small piece of Gelform. and the wound was sutured to maintain the brain temperature within the normal or nearnormal range.

t After 90 minutes of occlusion, the carotid loops were released, the tail artrial catheter was removed.

0 and all of the wounds were sutured. Gentancin sulfate (10 mg/ml) was topically applied to the wounds to prevent infection. The anesthetic was discontinued, and the animal was returned to his cage after awakening.

SWater and food were allowed ad libimum.

Two hours after MCA occlusion, the animals were given the same doses of the PARP inhibitor as in the pre-treatment. Twenty-four hours after MCA occlusion, the rats were sacrificed with an intraperitoneal injection of penobarbital sodium (150 mg/kg). The brain was carefully removed from the skull and cooled in ice-cold Cl artificial CSF for five minutes. The cooled brain was then sectioned in the coronal plane at 2 mm intervals 0\ tl- using a rodent brain matrix (RBM-1000C. ASI Instunents. Warren. Michigan). The brain slices were incubated in phosphate-buffered saline containing 2% 2.3.5-uiphenyltetrazolium chloride (TTC) at 37°C for ten l minutes. Color photographs were taken of the posterior surface of the stained slices and were used to determine o the damaged area at each cross-sectional level using a computer-based image analyzer (NIH Image 1.59). To O avoid artifacts due to edema. the damaged area was calculated by subtracting the area of the normal tissue in the hemisphere ipsilateral to the stroke from the area of the hemisphere contralateral to the stroke, by the method of Swanson et al.. "A Semiautomated Method for Measuring Brain Infarct Volume". J. Cereb. Blood Flow Metabol.

10:290-93 (1990). the disclosure of which is hereby incorporated by reference. The total volume of infarction was calculated by summation of the damaged volume of the brain slices.

The cauterization of the distal portion of the right MCA with bilateral temporary CCA occlusion consistently produced a well-recognized conical infarct in the right MCA territory of each test animal. There was an apparent uniformity in the distribution of the damaged area as measured by TTC staining in each group.

as shown in Figure 1.

In Figure 1. the distribution of the cross-sectional infarct area at representative levels along the ros:-ocaudal axis was measured from the interaural line in non-treated animals and in animals treated with mg/kg of 3.4-dihydro-5-[4-(l-piperidinyll-buto\xs--l(2H)-isoquinolinone. The area of damage was expressed as mean standard deviaton. Significant differences between the 10 mg-treated group and the control group were indicated -p<0 01. "p<0.00 The 5 mg/kg and 20 mg/kg curves fell approximately halfway between the control and the 10 mg/kg curves, whereas the 40 me/kg curve was close to the control. The 5. 20 and mg/kg curves were omitted for clarity.

PARP inhibition led to a significant decrease in the damaged volume in the 5 mg/kg-treated group (106.7 23.2 mm'. p<0.001). the 10 mg/kg-treated group (76.4 16.8 mm'. p<0.00 and the 20 mg/kgtreated group (110.2 42.0 mm'. p<0.01). compared to the control group (165.2 34.0 The data are expressed as mean standard deviation. The significance of differences between groups was determined using an analysis of variance (ANOVA) followed by Student's t-test for individual comparisons.

There was no significant difference between the control and the 40 mg/kg-treated group (135.6 44.8 However, there were significant differences between the 5 mg/kg-treated group and the 10 mg/kg-treated -66o group and between the 10 mg/kg-treated group and the 40 mg/kg-reated group as shown in SFigure 2.

In Figure 2. the effect of intraperitoneal administration of 3.4-dihydro-5-14-{l-piperidinyl)-butoxyI- 1(2H)-isoquinolinone on the infarct volume was depicted graphically. The volumes of infarct were expressed as mean standard deviation. Significant differences between the treated groups and the control group were indicated p<0.00l). It is not clear why a high dose (40 mg/kg) of the PARP inhibitor. 3.4-dihydro-5- |4-(I-piperidinyl)-butoxvyI- (2-fisoquinolinone. was less neuroprotective. The U-shaped dose-response curve l may suggest dual effects of the compound.

However. overall, the in vivo administrauon of the inhibitor led to a substantial reduction in infarct S 10 volume in the focal cerebral ischemia model in the rat. This result indicated that the activation ofPARP plays C an important role in the pathogenesis of brain damage in cerebral ischemia.

o The values of arterial blood gases (PaO,. PaCCO and pH) were within the physiological range in the Scontrol and treated groups with no significant differences in these parameters among the five groups, as shown Ctl below in Table III. A "steady state" MABP was taken following completion of the surgical preparation, just prior to occlusion: an "ischemia" MABP was taken as the average MABP during occlusion.

TABLE IIl MABP (mm Hg) PaO: PaCO: pH Steady Ischemia (mm He) (mm H) State Control group 125:21 38.6 7.33 79-14 91+13 4.6 0.05 mg/kg-treated group 126-20 38.0 7.36 78+ 5 9112 2.3 0.02 mg/kg-treated 125-16 39.3 7.34 802 9 90l14 eroup 0.03 mg/kg-treated 122:14 41.3 7.35 79:10 91+12 eroup (n= 7 18 2.8_0.23 mg/kg-treated 137+17 39.5 7.33 78±4 88 12 group 4.7 0.24 Significantly different from the steady state value. p<0.05.

SSignificantly different from the steady state value. p<0.01.

There were no significant differences in any physiological parameter, including mean arterial blood pressure (MABP), prior to MCA and CCA occlusion among the five groups. Although MABP was significantly elevated following occlusion in all five groups. there were no significant differences in MABP during the occlusion period among the groups.

Since the blood flow values obtained from the laser doppler were in arbtrary units. only percent changes from the baseline (prior to occlusion) were reported. Right MCA and bilateral CCA occlusion produced -67- 'a significant decrease in relative blood flow in the right parictal cortex to 20.8 7.7 of the baseline in the O control group 18,7 7,4 in the 5 mgkgg-treated group 21.4 7.7 in the 10 mg/kg-treated group and 193: 11.2 in the 40 mg/kg-treated group There were no significant differences in the blood flow response to occlusion among the four groups. In addition. blood flow showed no significant changes throughout the entire occlusion period in any group.

Following release of the carotid occlusions, a good recovery of blood flow (sometimes hypercmia) was observed in the right MCA territory of all animals. Reperfusion of the ischemic tissue resulted in the formnation Cl of NO and peroxynitrite. in addition to oxygen-derived free radicals. All of these radicals have been shown to I, cause DNA strand breaks and to activate PARP.

S 10 This example provided evidence that the related compounds of the present invention are effective in Cl inhibiting PARP activity.

O Exemplified compounds of the present invention are tested for their ability to reduce focal cerebral 0 ischemia in the following simplified procedure. Rats are allowed free access to water and rat chow (Wayne.

Chicago. 1L) until surgery. Housing and anesthesia concur with guidelines established by the institutional Animal Studies Committee, and are in accordance with the PHS Guide for the Care and Use of Laboratory Animals. USDA Regulations. and the AVMA Panel on Euthanasia guidelines.

The animals are anesthetized with isofluorane (induction, maintenance. 1.25% in a mixture of Q- and 70% NO: through a face mask. The rectal temperature is maintained at 37 "C with a homeothennic blanket (Harvard Apparatus. South Natick. MA). First. an iv catheter is inserted into the left femoral vein and the line run up through the nape of the neck for connection to a tethered swivel (Instech Laboratories. Plymouth Meeting. PA) and remote infusion pump (Stocking Inc.. Wood Dale, IL1. In some cases, the right femoral artery is cannulated for monitoring arterial blood pressure and heart rate and for obtaining blood samples for arterial blood 2as.

The right middle cerebral anrery (MCA) is then exposed by making vertical skin incision midway between the right eye and ear and overlying skull is removed with a dental drill (Chen et al. 1986). After incision of the dura. the artery is coagulated at the level of the inferior cerebral vein with a bipolar cautery unit (Vallevab NS2000. Boulder. CO). and cut to prevent spontaneous reperfusion (Takahashi et al.. 1997). Both common carotid arteries (CCAs) that had been previously isolated and freed of soft tissues and nerves are then ligated using non-traumatic aneurysm clips. After the wounds are closed with surgical clips, the animals are a1lowed to recover from anesthesia and returned to their cage which is warmrned to 27°C with a heated water ,nderpad and humidified warm tent.

The PARP inhibitor to be tested is first administered 30 min after MCAO as an iv bolus. 10 mg/kg infused over 5 min. followed by a 12 hr continuous infusion of 2 mg/kg/hr (0.3 ml/hr). Ninety minutes after the MCAO. the animals are removed from the infusion tether. briefly reanestheuzed with isofluorane. and the carotid clips are removed. The animal is returned to its %warm cage and reconnected to the iv infusion pump for the duration of the experiment.

68 o At 24 hrs after permanent MCAO. animals are sedated with ketamine and the heads removed by Sguillotine. Brains are removed, cooled in ice-cold saline, and sliced into 2 mm coronal sections using a rat F brain matrice (Harvard Bioscience. South Natick. MA). The brain slices are incubated in phosphate-buffered saline ipH 7.4) containing 2% TTC at 37C for 10 min. and then stored in 10% neutral-buffered formalin.

I 5 Cross-sectional area of the TTC-unstained region for each brain slice is determined using an image analyzer (MetaMorph. Universal Imaging Corp.. West Chester. PA): The total volume of infarction in the right hemisphere is calculated by summation of the direct (TTC-negative) and indirect measures of the infarct areas in the component brain slices. The infarcted volumes in vehicle and drug-treated groups are tested for lf significant statistical difference using an unpaired Student-i test.

o 10 Various doses of the compounds of the invention are tested in this model. The compounds are administered in either a single dose or a series of multiple doses, i.p. or at different times, both before or Safter the onset of ischemia. Compounds of the invention are expected to provide protection from ischemia in the range of about 0 to Heart ischemia/Reperfusion injury The experiments of the heart ischenuarreperfusion injury model is performed using female Sprague- Dawley rats weighing 250-300g which are anesthetized with sodium pentobarbital at dose of 65 mg/kg intraperitoneally. The rectal temperature is maintained at 37°C by using a homeothermic blanket system (Harvard Apparatus. South Natick. MA). The trachea is cannulated and the rat is ventilated with Room Air by using Harvard Rodent Ventilator (Harvard Apparatus. South Natick. MA). The left jugular vein is cannulated with PE-50 tubing for drug delivery. The right caroud artery is cannulated for BP measurement. The heart is exposed by opening the chest at the 4' left intercostal space. A main left branch of coronary artery (LAD) is occluded by 4-0 silk ligature for 30 min of ischemia and released for 90 min of reperfusion. During the experiment. arterial BP and EKG are monitored by Micro-Med Cardiovascular System (Louisville. KY.

At the end of reperfusion. the LAD coronary artery is re-occluded and about 2 mi of 5% Evans Blue dye is injected through i.v. line to distinguish the ischemic area from non-ischemic area of the hean. Then the heart is immediately taken off and frozen in the freezer. After at least 30 min of freezing. the hear is sliced into five sections with 2 mm thickness and stained in L% TTC solution for 30 min at 37C. The righ ventricle is trimmed off. Infarct area. risk area and total left ventricular area in each face of the section are measured by using an image analysis system (BIOQUANT. Nashville. TN). The infarct size is calculated as the percent total infarct volume of the total risk volume.

For drug treated group. Compounds are administered according to the following three protocols: 1.

Single dose of compound is given 60 min prior to tie onset of ischemia through i. p. injection. 2. Compound is delivered through i.v. bolus 1 min before the onset of ischemia followed by i.v. infusion until the end of reperfusion. 3. Compound is delivered through i.v. bolus I min before the onset of reperfusion followed by i.v.

infusion until the end of reperfusion. For each drug-treated group. there is a corresponding vehicle treated group -69-

M

l with n=6 or n=9. The difference between vehicle and drug treated groups is compared by using unpaired I-test o with p<0.05. Various doses of compounds are tested in this model. The compounds are given in either single or Cl multiple doses, i.p or at different times before or after the onset of ischemia. The compounds of this invention are expected to have ischemuaireperfusion injury protection in the range of 10 to 40 percent in this 5 Sassay.

As a result of the PARP inhibition activity. the compounds of this invention are expected to protect against ischemia-induced degeneration of rat conical neurons in vitro and thus may be useful in disorders arising from cerebral ischemia such as stroke, septic shock. or CNS degenerative disorders. They may also be 0useful in protecting the spinal cord following trauma. As an experimental result of ischemia/reperfusion injury 10 in rats, the present invention is further directed to a method of prophylactic or therapeutic treatment of heart S attack, cardiac arrest, cardiac bypass. diabetes. or risk of damage which comprises administering an effective 1T amount of a compound of the present invention for PARP inhibition in unit dosage form.

0 In vitro Radiosensitization In itro radiosensitization may be measured with the use of a human prostate cancer cell line. PC-3s.

which are plated in 6 well dishes and grown at monolayer cultures in RPMI 1640 supplemented with 10% FCS.

The cells are maintained at 37 0 C in CO: and 95% air. The cells are exposed to a dose response (0,1 mM to 0.1 lo of 3 different PARP inhibitors prior to irradiation at one sublethal dose level. For all treatment groups.

the six well plates are exposed at room temperature in a Seifert 250kV/l5mA irradiator with a 0.5 mm Cu/l mm.

Cell viability is examined by exclusion of 0.4% trypan blue, Dye exclusion is assessed visually by microscopy and viable cell number was calculated by subtracting the number of cells from the viable cell number and dividing by the total number of cells. Cell proliferation rates are calculated by the amount of H-thymidine incorporation post-irradiation. The PARP inhibitors are expected to radiosensitize the cells.

Measunng Altered Gene Expression in mRNA Senescent Cells Gene expression alteration may be measured with human fibroblast BJ cells which. at Population Doubling (PDL) 94. are plated in regular growth medium and then changed to low serum medium to reflect physiological conditions described in Linskens. et al.. Nucleic Acids Res. 23:16:3244-3251 (1995). A medium of DMEM/199 supplemented with 0.5% bovine calf serum is used. The cells are treated daily for 13 days. The control cells are treated with and without the solvent used to administer the PARP inhibitor. The untreated old and young control cells are tested for comparison. RNA is prepared from the treated and control cells according to the techniques described in PCT Publication No. 96/13610 and Northern blotting is conducted. Probes specific for senescence-related genes are analyzed, and treated and control cells compared. In analyzing the results, the lowest level of gene expression is arbitrarily set at I to provide a basis for comparison. Three genes particularly relevant to age-related changes in the skin are collagen, collagenase and elastin. West, Arch. Derm.

130:87-95 (1994). Elasun expression of the cells treated with the PARP inhibitor is expected to be significantly 't increased in comparison with the control cells Elastin expression should be significantly higher in young cells O compared to senescent cells, and thus treatment with the PARP inhibitor should cause elastin expression levels Cl in senescent cells to change to levels similar to those found in much younger cells. Similarly, a beneficial effect should be seen in collagenase and collagen expression with teatmnem with the PARP inhibitors.

Measuring Altered Gene Expression of Protein in Senescent Cells Gene expression alteration may be measured with approximately 105 BJ cells, at PDL 95-100 which C, are plated and grown in 15 cm dishes. The growth medium is DMEM/199 supplemented with 10% bovice calf Sserum. The cells are treated daily for 24 hours with the PARP inhibitors of (100 Lg/ 1 mL of medium) WO 99/11645. The cells are washed with phosphate buffered solution (PBS). then permeablized with 4% 0paraformaldehyde for 5 minutes, then washed with PBS. and treated with 100% cold methanol for 10 minutes.

SThe methanol is removed and the cells are washed with PBS. and then treated with 10% serum to block O nonspecific antibodv binding. About I mL of the appropriate commercially available antibody solutions (1:500 dilution. Vector) is added to the cells and the mixture incubated for 1 hour. The cells are rinsed and washed three times with PBS. A secondary antibody. goat anti-mouse IgG (1 mL) with a biotin tag is added along with I mL of a solution containing streptavidin conjugated to alkaline phosphatase and I mL of NBT reagent (Vector). The cells are washed and changes in gene expression are noted colorimetrically. Four senescencespecific genes collagen I. collagen Ill. collagenase. and interferon gamma in senescent cells treated with the PARP inhibitor are monitored and the results should show a decrease in interferon gamma expression with no observable change in the expression levels of the other three gens. demonstrating that the PARP inhibitors can alter senescence-specific gene expression.

Extending or Increasing Proliferative Capacity and Lifespan of Cells To demonstrate the effectiveness of the present method for extending the proliferative capacity and lifespan of cells, human fibroblast cells lines (either W138 at Population Doubling (PDL, 23 or BJ cells at PDL 71) are thawed and plated on T75 flasks and allowed to grow in normal medium (DMEM/M199 plus bovine calf serum) for about a week. at which time the cells are confluent, and the cultures are therefor ready to be subdivided. At the time of subdivision, the media is aspirated, and the cells rinsed with phosphate buffer saline (PBS) and then trypsinized. The cells are counted with a Coulter counter and plated at a density of 10 s cells per cm: in 6-well tissue culture plates in DMEM/199 medium supplemented with 10% bovine calf serum and varying amounts lOIM. and ImM: from a IOOX stock solution in DMEM/M199 medium) of a PARP inhibitor. This process is repeated every 7 days until the cells appear to stop dividing. The untreated (control) cells reach senescence and stop dividing after about 40 days in culture. Treatment of cells with 10 uM 3-AB appears to have little or no effect in contrast to treatment with 100 pM 3-AB which appears lengthen the lifespan of the cells and treatment with i mM 3-AB which dramatically increases the lifespan and proliferative capacity of the cells. The cells treated with I mM 3-AB will still divide after 60 days in culture.

O

O Neuroprntective Effects of PARP Inhihitors on Chrnnic Constriction Injury (CCI in Rats SAdult male Sprague-Dawley rats. 300-350 g. are anesthetized with intraperitoneal 50 mg/kg sodium pencobarbital. Nerve ligation is performed by exposing one side of the rat's sciatic nerves and dissecting a 5-7 Smm-long nerve segment and closing with four loose ligatures at a 1.0-1.5-mm followed by implanting of an intrathecal catheter and inserting of a gentamicin sulfate-flushed polyethylene (PE-10) tube into the subarachnoid space through an incision at the cisterna magna. The caudal end of the catheter is gently threaded to the lumbar enlargement and the rostral end is secured with dental cement to a screw embedded in the skull tl 10 and the skin wound is closed ith wound dips.

SThermal hyperalgesia to radiant heat is assessed by using a paw-withdrawal test. The rat is placed in a

C

n plastic cylinder on a 3-mm thick glass plate with a radiant heat source from a projection bulb placed directly O under the plantar surface of the rat's hindpaw. The paw.-ithdrawal latencv is defined as the time elapsed from the onset of radiant heat stimulation to withdrawal of the rat's hindpaw.

Mechanical hyperalgesia is assessed by placing the rat in a cage with a bottom made of perforated metal sheet with many small square holes. Duration of paw-withdrawal is recorded after pricking the mid-plantar surface of the rat's hindpaw with the tip of a safety pin inserted through the cage bottom.

Mechano-allodynia is assessed by placing a rat in a cage similar to the previous test and applying von Frey filaments in ascending order of bending force ranging from 0.07 to 76 g to the mid-plantar surface of the rats hindpaw. A von Frey filament is applied perpendicular to the skin and depressed slowly until it bends. A threshold force of response is defined as tie first filament in the series to evoke at least one clear pawwithdrawal out of five applications.

Dark neurons are observed bilaterally within the spinal cord dorsal horn. particularly in laminae I-II. of rats 8 days after unilateral sciatic nerve ligation as compared with sham operated rats. Various doses of PARP inhibitors are tested in this model and shown to reduce both incidence of dark neurons and neuropathic pain behavior in CCI rats.

The invention being thus described, it nill be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications are intended to be included within the scope of the following claims. All references cited herein are incorporated in their entirety by reference herein.

Claims (35)

1. 2. A compound of claim I wherein min and n are zero. p is one. W is -CN and are hydrogen.
2. 3. A compound of claim 1. wherein m and n are zero. p is one. W is -CN. T is Z and X are oxygen. Y is N and R, to R- are hydrogen.
3. 4. A compound of claim 1. wherein wherein p is one and W is A compound of claim 4. selected from the group consisting of: NO 0 N 2005202592 15 Jun 2005 0 In 0 z I 1 S 'a tO- C) 2005202592 15 Jun 2005 0- 0 0 2-I 0 0 3 xx ON I 2005202592 15 Jun 2005 0 0 0 Z0\\ 0)\ 2005202592 15 Jun 2005 0 zx 0 0c=< 0 a zx z D z
4. 6. A compound of claim I wherein p is one and W is selected from the group consisting of P(O)-OR, and
5. 7. A compound of claim 6 selected from the group consisting of co r°^
6. 8. A compound of claim I wherein p is one and W is selected from the group consisting of S(O)-Ri. -S(OkOR, and -S(0):NR9
7. 9. A compound of claim 8 selected from the group consisting of: H II OH a S79- 2005202592 15 Jun 2005 61 010 ZI 04/ A compound of claim I wherein p is one and W is or
8. 11. A compound of claim 10 selected from the group consisting of -81- 2005202592 15 Jun 2005 n 12. A compound of claim I wherein p is one and W is a heteroaryl or a cycloalkyl optionally 0 conwtaining at least one heteroatom
9. 13. A compound of claim 12 selected from the group consisting of: 0 0 Ino Y and 00 N N 0 o9
10. 14. A compound of Formula (II) RX Re (N(R fl)ldtC(O.JR, R3 R, az R1 or a pharmaceutically acceptable salt hydrate. prodrug. or mixtures thereof. wherein: q is zero or one; Y is N, -CH- or -CH 2 Z is O: X is or a bond: R 1 R R. and R- are independently: hydrogen lower alkvl. lower alkenyl. cyloalkyl optionally containing at least one heteroatom. lower alkoxy. aryl. hezeroaryl. aralkyl. heteroaralkyL alkaryl. alkhecteroarly. hydroxy. amino. nitro. halo. nitroso. or carboxy; 1. is hydrogen. lower alkvl. cycloalkvl optionally containing at least one heteroatomn lower alkenyl. aryl. heteroaryL aralkvl. heteroaralkvl. alkaiyl. alkheteroaryl. hydroxy, alkoxy. amino. or carboxy: and -83 M T. when present is a divalent or trivalent organic radical independently selected from the group consisting of: lower alkviene. lower alkenylene. arviene. aralkviene. and alkarylene: l wherein one. two or three of the hydrogen atoms of said divalent or trivalent organic radical can be substituted by a moiety selected from the group consisting of: lower alkyl. lower alkenyl. al. aralkvl. alkarl. halo. trifluoromethyl. hydroxy. alkoxy. amino. nitro. triluoromethyl. alkenyloxy, phenoxy. and benzyio.xy wherein one. two. or three carbon atoms in the divalent or trivalent organic radical can be replaced by a heem-atom-containing-moiey selected from the group consisting of: penoxy. phenoxycarbonvyl. benzvloxy. -NRISO:-. -SO:NRt-. -NRi- and wherein the lower alkyi. cvloalkil optionally containing at least one heteroatom. lower alkenyl. aryl. heteroarvil aralkii. hereroaralkyl. alkarvL and alkhereroan-l groups can be independently substituted with one. two or three substiuents selected from the group consisting of: In lower alktl. cycolalkvl optionally containing at least one heteratomn lower alkenyl. aryl. heteroaryl. aralkvl. Sbeteroaralkyl. alkarYl. alkheteroanl. halo. trifluoromethyl. hydroxy, alkoxv. carboxy. carbonyl. lower alkvl ester. Cl amino. nitro. trifluoromethyl. alkenvloxv. phenoxv. benzlox. wherein one, two. or three carbon atoms thereof can be replaced by a hetero-atom-containing-moiery selected from the group consisting of: -NR, -SONR-. and -POr. A compound according to Formula (II) 4 (111) I Y R7 R, 2 I S0 2 ((NR 7 ,(N(R 8 RS))) 2 X R3 R, wherein Z and X are oxygen: Y is N. -CH- or -CH2; q is zero or one: "alk" is lower alkylene: Ri Ri, and Ri, are independently hydrogen or lower alkyl: or R and Rs or and RI, taken together can be a lower alkylene to form a hererocyclic ring; and rRI R R. R3. L. RA and R- are independently: hydrogen, lower alkyl. cycloalkyi optionally containing C at least one hezero atom. lower alkenyL lower alkoxy. aryl. heteroaryl. aralkyl. hetemroaralkyl. alkaryl. c alkhe eroaryl. hydroxy. amino. nitro. halo. nitroso. or carboxy. -16. A pharmaceutical composition which comprises: a therapeutically effective amount of a -compound according to claim I and (ii) a pharmaceutically acceptable carrier. Cl 17. The pharmaceutical composition of claim 16. wherein the carrier is a sterile solution, I/f suspension or emulsion, in a single or divided dose. Cl 0 Cl 18. The pharmaceutical composition of claim 16. wherein the carrier is a capsule or tablet O containing a single or divided dose of said compound. ("4
11. 19. The pharmaceutical composition of claim 16. wherein the carrier comprises a biodegradable polymer. The pharmaceutical composition of claim 19. wherein the biodegradable polymer releases the compound of formula I over a prolonged period of time.
12. 21. The pharmaceutical composition of claim 16. wherein the carrier is a solid implant.
13. 22. The pharmaceutical composition of claim 16 for inhibiting PARP activity, treating or preventing diseases or disorders, altering gene expression, or radiosensitizing.
14. 23. The pharmaceutical composition of claim 22. wherein the diseases or disorders are not mediated by NMDA toxicity.
15. 24. The pharmaceutical composition of claim 22. wherein the diseases or disorders are selected from the group consisting of tissue damage resulting from cell damage or death due to necrosis or apoptosis. neuronal mediated tissue damage or diseases, neural tissue damage resulting from ischemia and reperfusion injury. neurological disorders and neurodegenerative diseases, vascular stroke, cardiovascular disorders, age- related muscular degeneration. AIDS and other immune senescence diseases, arthritis, atherosclerosis, cachexia. cancer, degenerative diseases of skeletal muscle involving replicative senescence, diabetes, head trauma, immune senescence, inflammatory bowel disorders, muscular dystrophy. osteoartuitis. osteoporosis. chronic pain. acute pain. neuropathic pain. nervous insult, peripheral nerve injury. renal failure, retinal ischemia, septic shock, and 1 skin aging. diseases or disorders relating to lifespan or proliferative capacity of cells, and diseases or disease O O conditions induced or exacerbated by cellular senescence.
16. 25. The phannaceutical composition of claim 24. wherein the neurological disorder is selected from the group consisting of peripheral neuropathy caused by physical injury or disease state, traumatic brain injury. physical damage to the spinal cord. stroke associated with brain damage, and demyelinating diseases.
17. 27. The pharmaceutical composition of claim 25. wherein the peripheral neuropathy is caused by SGuillain-Barre syndrome.
18. 28. The pharmaceutical composition of claim 25. wherein the demyelinating disease is multiple sclerosis. 0
19. 29. The pharmaceutical composition of claim 24. wherein the neurodegenerative disease is selected from the group consisting of Alzheimer's Disease. Parkinson's Disease. Huntineion's Disease and amyotropic later. sclerosis. The pharmaceutical composition of claim 24. wherein the cancer is selected from the group consisting of ACTH-producing tumors. acute lymphocylic leukemia, acute nonlymphocyvic leukemia cancer of the adrenal cortex, bladder cancer, brain cancer, breast cancer. cervix cancer, chronic lymphocytic leukemia. chronic myelocytic leukemia. colorectal cancer, cutaneous T-cell lymphoma- endometrial cancer, esophageal cancer. Ewing's sarcoma, gallbladder cancer, hairy cell leukemia, head neck cancer. Hodgkin's lymphoma. Kaposi's sarcoma, kidney cancer. liver cancer. lung cancer (small and/or non-small cell), malignant peritoneal effusion, malignant pleural effusion. melanoma mesothelioma. multiple myeloma, neuroblastoma. non- Hodgkin's lymphoma. osteosarcoma, ovanr cancer, ovary (germ cell) cancer, prostate cancer, pancreatic cancer. penile cancer. retinoblastoma. skin cancer. soft-tissue sarcoma. squamous cell carcinomas, stomach cancer. testicular cancer, thyroid cancer. trophoblastic neoplasms. cancer of the uterus, vaginal cancer, cancer of the vulva and Wilm's tumor.
20. 31. The pharmaceuucal composition of claim 24. wherein the bowel disorder is colitis.
21. 32. The pharmaceutical composition of claim 24. wherein the bowel disorder is Crohn's disease.
22. 33. The pharmaceutical composition of claim 24. wherein the cardiovascular disorder is selected from the group consisting of cardiovascular tissue damage, coronary anery disease. myocardial infarction. angina pectoris and cardiogenic shock. in 0 o
23. 34. The pharmaceutical composition of claim 24. wherein the septic shock is endotoxic shock. The pharmaceuutical composition of claim 24. wherein the disease or disease condition induced In~ or exacerbated by cellular senescence is selected from the group consisting of skin aging. Alzheimer's disease. Satherosclerosis, osteoanrthritis. osteoporosis. muscular dystrophy, age-related muscular degeneration, immune senescence, and AIDS. ci I 36. A method of inhibiting PARP activity. treating or preventing diseases or disorders, altering o gene expression, or radiosensitizing. comprising: administering a therapeuticaly effective amount of a compound of claim 1. 0 S37. The method of claim 36. wherein the compound is administered as a sierile solution. suspension or emulsion, in a single or divided dose.
24. 38. The method of claim 36. wherein the compound is administered as a capsule or tablet containing a single or divided dose of said compound.
25. 39. The method of claim 36. wherein the compound is administered with a biodegradable polymer. The method of claim 39. wherein the biodegradable polymer releases the compound of formula I over a prolonged period of time.
26. 41. The method of claim 36. wherein the compound is administered with a solid implant.
27. 42. The method of claim 36. wherein the diseases or disorders are not mediated by NMDA toxicity.
28. 43. The method of claim 36. wherein the diseases or disorders are selected from the group consisting of tissue damage resulting from cell damage or death due to necrosis or apoptosis. neuronal mediated tissue damage or diseases, neural tissue damage resulting from ischemia and repcrfusion injury, neurological disorders and neurodegenerative diseases, vascular stroke, cardiovascular disorders, age-related muscular degeneration. AIDS and other immune senescence diseases, arthitis, atherosclerosis, cachexia, cancer, degenerative diseases of skeletal muscle involving replicative senescence. diabetes. head trauma, immune senescence, inflammatory bowel disorders, muscular dystrophy, osteoarthritis. osteoporosis. chronic pain. acute pain. neuropathic pain. nervous insult, peripheral nerve injury, renal failure, retinal ischemia, septic shock, and o skin aging, diseases or disorders relaung to lifespan or proliferative capacity of cells. and diseases or disease Scondiuons induced or exacerbated by cellular senescence.
29. 44. The method of claim 43. wherein the neurological disorder is selected from the group Sconsisting of peripheral neuropathy caused by physical injury or disease state, traumatic brain injury. physical damage to the spinal cord. stroke associated with brain damage, and demvelinating diseases. C] 45. The method of claim 44, wherein the peripheral neuropathy is caused by Guillain-Barre Ssyndrome. C 46. The method of claim 44. wherein the demyclinating disease is multiple sclerosis. S47. The method of claim 43. wherein the neurodegenerative disease is selected from the group consisting of A4zheimer's Disease. Parkinson's Disease. Huntington's Disease and amyotropic lateral sclerosis.
30. 48. The method of claim 43. wherein the cancer is selected from the group consisting of ACTH- producing tumors. acute lymphocyic leukemia- acute nonlymphoctic leukemia. cancer of the adrenal conex. bladder cancer, brain cancer, breast cancer. cervix cancer, chronic lymphocvtic leukemia. chronic myelocytic leukemia- colorectal cancer. cutaneous T-cell lymphoma. endomerial cancer. esophageal cancer. Ewing's sarcoma, gallbladder cancer. thary cell leukemia. head neck cancer. Hodgkin's lymphoma. Kaposi's sarcoma. kidney cancer, liver cancer, lung cancer (small and/or non-small cell). malignant peritoneal effusion. malignant pleural effusion, melanoma. mesotielioma. multiple myeloma. neuroblastoma. non-Hodgkin's lymphoma. osteosarcoma. ovary cancer. ova ry germ cell) cancer, prostate cancer, pancreatic cancer, penile cancer. retinoblastoma. skin cancer, soft-tissue sarcoma. squamous cell carcinomas. stomach cancer, tesucular cancer. thyroid cancer. trophoblastic neoplasms. cancer of the uterus, vaginal cancer. cancer of the vulva and Wilm's tumor.
31. 49. The method of claim 43. wherein the bowel disorder is colitis. The method of claim 43. wherein the bowel disorder is Crohn's disease.
32. 51. The method of claim 43. wherein the cardiovascular disorder is selected from the group consisting of cardiovascular tissue damage, coronary artery disease, myocardial infarction. angina pectoris and cardiogenic shock.
33. 52. The method of claim 43. wherein the septic shock is endotoxic shock. -88
34. 53. The method of claim 43. wherein the disease or disease condition induced or exacerbated by cellular senescence is selected from the group consisting of skin aging. Alzheimer's disease. atherosclerosis. ostoarthriis. osteoporosis. muscular dstrophy. age-related muscular degeneration, immune senescence. and AIDS.
35. 54. A compound according to Formula (IV) or Formula (V) wherein, R. Rs. and are independently: hydrogen lower alkyl. lower aikenyl, cyloalkyl optionally containing at least one heteroatom. lower alkoxy. aryl. heteroarl. aralkyl. heteroaralkyl. alkaryl. alkheteroarlv. hydroxv. amino. nitro. halo. nitroso. or carboxy. DATED this 15" day of June 2005 GUILFORD PHARMACEUTICALS INC. By their Patent Attorneys CULLEN CO. -89-