HK1029922B - Angiostatic agents and compositions for treating glc1a glaucoma - Google Patents

Description

Background of the Invention Field of the Invention

This invention is directed to the use of angiostatic agents for the manufacture of a medicament treating glaucoma or ocular hypertension resulting from altered expression of the GLC1A gene (hereinafter GLC1A or 1q glaucoma) in an individual.

Description of Related Art

The glaucomas are a heterogeneous group of optic neuropathies characterized by cupping of the optic nerve head, thinning of the retinal nerve fiber layer due to loss of retinal ganglion cells, and specific pathognomonic changes in visual fields. Elevated intraocular pressure (IOP) is a very important risk factor for the development of most common forms of glaucoma (Sommer A, et al., "Relationship Between Intraocular Pressure and Primary Open Angle Glaucoma Among White and Black Americans," Arch. Ophthalmol., 109:1090-1095, (1991)).

A family history of glaucoma also is an important risk factor for the development of glaucoma. It appears that a significant portion of glaucoma is inherited (or at least the risk for developing glaucoma is inherited) although it is often difficult to establish clear inheritance patterns for most of the glaucomas because of the disease onset late in life and the slowly progressive clinical manifestations of the disease. Despite these problems, a number of families with heritable forms of glaucoma have been identified and these families have been used to map a variety of glaucoma genes (Sheffield, et al., "Genetic Linkage of Familial Open Angle Glaucoma to Chromosome 1q21-q31," Nature Genetics, 4:47-50 (1993); Sarfarazi, et al., "Assignment of a Locus (GLC3A) for Primary Congenital Glaucoma (Buphthalmos) to 2p21 and Evidence for Genetic Heterogeneity," Genomics, 30:171-177 (1995); Akarsu, et al., "A Second Locus (GLC3B) for Primary Congenital Glaucoma (Buphthalmos) Maps to the 1p36 Region," Human Molecular Genetics, 5(8):1199-1203 (1996); Stoilova, et al., "Localization of a Locus (GLC1B) for Adult-Onset Primary Open Angle Glaucoma to the 2cen-q13 Region," Genomics, 36:142-150 (1996); Wirtz, et al., "Mapping a Gene for Adult-Onset Primary Open-Angle Glaucoma to Chromosome 3q," Am. J. Hum. Genet., 60:296-304 (1997); Andersen, et al., "A Gene Responsible for the Pigment Dispersion Syndrome Maps to Chromosome 7q35-q36," Arch. Ophthalmol., 115:384-388 (1997). The first glaucoma gene mapped (GLC1A) was in a large family with autosomal dominant inherited juvenile glaucoma (JG). This disease is characterized by an early disease onset (late teens to early 20s), relatively high lOPs, and general resistance to conventional pharmacological IOP lowering therapy. The GLC1A gene was mapped by positional cloning and linkage analysis to chromosome 1q22-q25 (Sheffield et al, Id.), and a number of other groups have confirmed the 1q location of this juvenile glaucoma gene (Richards, et al., "Mapping of a Gene for Autosomal Dominant Juvenile-Onset Open-Angle Glaucoma to Chromosome 1q," Am. J. Hum. Genet., 54:62-70 (1994); Morissette, et al., "A Common Gene for Juvenile and Adult-Onset Primary Open-Angle Glaucomas Confined on Chromosome 1q," Am. J. Hum. Genet., 56:1431-1442 (1995); Wiggs, et al., "Genetic Linkage of Autosomal Dominant Juvenile Glaucoma to 1q21-q31 in Three Affected Pedigrees," Genomics, 21:299-303 (1994); Meyer, et al., "Age-Dependent Penetrance and Mapping of the Locus for Juvenile and Early-Onset Open-Angle Glaucoma on Chromosome 1q (GLC1A) in a French Family," Hum. Genet., 98:567-571 (1996); Graff, et al., "Confirmation of Linkage to 1q21-31 in a Danish Autosomal Dominant Juvenile-Onset Glaucoma Family and Evidence of Genetic Heterogeneity," Hum. Genet., 96:285-289 (1995). Glaucoma due to the GLC1A gene is often referred to as 1q glaucoma.

The GLC1A gene was identified as encoding a 57 kD protein expressed in the trabecular meshwork (TM) (Stone, et al., "Identification of a Gene That Causes Primary Open Angle Glaucoma," Science, 275:668-670 (1997). The expression of the GLC1A gene, and the encoded TM protein, is up-regulated by glucocorticoids (Polansky, et al., "Eicosanoid Production and Glucocorticoid Regulatory Mechanisms in Cultured Human Trabecular Meshwork Cells," The Ocular Effects of Prostaglandins and Other Eicosanoids, pp. 113-138 (1989); Polansky, et al., "In Vitro Correlates of Glucocorticoid Effects on Intraocular Pressure," Glaucoma Update IV (1991); and Polansky, et al., "Cellular Pharmacology and Molecular Biology of the Trabecular Meshwork Inducible Glucocorticoid Response Gene Product," Ophthalmologica, 211:126-139 (1997)). This TM protein is also known as TIGR (trabecular meshwork inducible glucocorticoid response) (Polansky, Id.). The glucocorticoid-induction of this TM protein has been suggested to be involved in the generation of glucocorticoid-induced ocular hypertension and glaucoma (Polansky, Id.).

The GLC1A gene is expressed in other ocular tissues such as the ciliary epithelium (Ortego, et al., "Cloning and Characterization of Subtracted cDNAs from a Human Ciliary Body Library Encoding TIGR, a Protein Involved in Juvenile Open Angle Glaucoma with Homology to Myosin and Olfactomedin," FEBS Letters, 413:349-353 (1997)) and the retina (Kubota, et al., "A Novel Myosin-like Protein (Myocilin) Expressed in the Connecting Cilium of the Photoreceptor: Molecular Cloning, Tissue Expression, and Chromosomal Mapping," Genomics, 41:360-369 (1997)). The gene is referred to by several names including GLC1A (Sheffield, supra; Sunden, et al., "Fine Mapping of the Autosomal Dominant Juvenile Open Angle Glaucoma (GLC1A) Region and Evaluation of Candidate Genes," Genome Research, 6:862-869 (1996); Stone, et al., supra), TIGR (Polansky supra; Ortego, supra), and myocilin (Kubota, supra). Mutations GLC1A are not only responsible for juvenile glaucoma, but also a significant subset of adult onset primary open angle glaucoma (Stone, et al., supra; Adam, et al., "Recurrent Mutations in a Single Exon Encoding the Evolutionarily Conserved Olfactomedin-Homology Domain of TIGR in Familial Open-Angle Glaucoma," Human Molecular Genetics, 6(12):2091-2097 (1997)). The 1q glaucoma gene (GLC1A, TIGR) is the subject of Nguyen, et al., U.S. Patent No. 5,606,043, issued February 25, 1997.

Glucocorticoids have been associated with the development of ocular hypertension and primary open angle glaucoma (Kass, et al., "Corticosteroid-Induced Glaucoma, In Ritch, R., Shields, M. B., Krupin, T. (eds.)," The Glaucomas, The C. V. Mosby Company, St. Louis, MO, pp. 1161-1168 (1989); DeSantis, et al., "Dexamethasone-Induction of Ocular Hypertension in the Primate, ARVO Abstracts. Invest. Ophthalmol. Vis. Sci., 31(Suppl.):99 (1990); Knepper, et al., "Intraocular Pressure and Glycosaminoglycan Distribution in the Rabbit Eye: Effect of Age and Dexamethasone," Exp. Eye Res., 27: 567-575 (1978); Francois, et al., "Ultrastructural and Morphometric Study of Corticosteroid Glaucoma in Rabbits, Ophthalmic Res., 16:168-178 (1984); Lorenzetti, O. J., "Effects of Corticosteroids on Ocular Dynamics in Rabbits," J. Pharmacol. Exp. Therap., 175:763-772 (1970); and Zhan, et al., "Steroid Glaucoma: Corticosteroid-Induce Ocular Hypertension in Cats," Exp. Eye Res., 54:211-218 (1992)). Glaucoma patients have also been reported to have higher levels of the endogenous glucocorticoid, cortisol (Rozsival, et al., "Aqueous Humour and Plasma Cortisol Levels in Glaucoma and Cataract Patients," Current Eye Research, 1:391-396 (1981); Ray, et al., "Plasma Cortisol in Glaucoma," Ann. Ophthalmol., 9:1151-1154 (1977); and Schwartz, et al., "Increased Plasma Free Cortisol in Ocular Hypertension and Open Angle Glaucoma," Arch. Ophthalmol., 105:1060-1065 (1987)).

It is known that trabecular meshwork cells have glucocorticoid receptors and that glucocorticoid binding with these receptors causes a change in trabecular meshwork cell gene expression. Known manifestations of this change include a reorganization of the cytoskeleton (Wilson, et al., "Dexamethasone Induced Ultrastructural Changes in Cultured Human Trabecular Meshwork Cells, Cur. Eye Res., 12:783-793 (1993), and Clark, et al., "Glucocorticoid-Induced Formation of Cross-Linked Actin Networks in Cultured Human Trabecular Meshwork Cells," Invest. Ophthalmol. Vis. Sci., 35:281-294 (1994)) and increased deposition of the extracellular matrix material in trabecular meshwork cells. As a result, the trabecular meshwork becomes "clogged" and unable to perform one of its most critical functions, that is, serving as a gateway for aqueous humor flow from the anterior chamber of the eye. When the aqueous humor flow out of the eye via the trabecular meshwork is diminished, the intraocular pressure of the eye rises. If this state of elevated intraocular pressure is maintained or frequently occurs, the optic nerve head can be damaged resulting in the loss of visual field. Loss of visual field is the hallmark symptom associated with glaucoma.

Endogenous glucocorticoids may be responsible for producing the changes in the trabecular meshwork that lead to ocular hypertension and glaucoma.

In summary, the GLC1A gene product can lead to the development of ocular hypertension and glaucoma in one of two ways: (1) mutations in GLC1A are responsible for most forms of juvenile glaucoma and a subset of adult onset POAG or (2) exposure of some individuals to glucocorticoids leads to increased GLC1A expression in the TM which causes increased aqueous humor outflow resistance and the development of ocular hypertension. The precise mechanism(s) responsible for GLC1A effects on IOP are currently unknown.

Steroids functioning to inhibit angiogenesis in the presence of heparin or specific heparin fragments are disclosed in Crum, et al., "A New Class of Steroids Inhibits Angiogenesis in the Presence of Heparin or a Heparin Fragment," Science, 230:1375-1378 (December 20, 1985). The authors refer to such steroids as "angiostatic" steroids. Included within the new class of steroids found to be angiostatic are the dihydro and tetrahydro metabolites of cortisol and cortexolone. In a follow-up study directed to testing a hypothesis as to the mechanism by which the steroids inhibit angiogenesis, it was shown that heparin/angiostatic steroid compositions cause dissolution of the basement membrane scaffolding to which anchorage dependent endothelia are attached resulting in capillary involution; see, Ingber, et al., "A Possible Mechanism for Inhibition of Angiogenesis by Angiostatic Steroids: Induction of Capillary Basement Membrane Dissolution," Endocrinology, 119:1768-1775 (1986).

A group of tetrahydro steroids useful in inhibiting angiogenesis is disclosed in International Patent Application No. PCT/US86/02189 (WO 87/02672), Aristoff, et al., (The Upjohn Company). The compounds are disclosed for use in treating head trauma, spinal trauma, septic or traumatic shock, stroke and hemorrhage shock. In addition, the patent application discusses the utility of these compounds in embryo implantation and in the treatment of cancer, arthritis and arteriosclerosis. The compounds are not disclosed for ophthalmic use.

Tetrahydrocortisol (THF) has been disclosed for its use in lowering the intraocular pressure (IOP) of rabbits made hypertensive with dexamethasone alone, or with dexamethasone/5-beta-dihydrocortisol; see Southren, et al., "Intraocular Hypotensive Effect of a Topically Applied Cortisol Metabolite: 3-alpha, 5-beta-tetrahydrocortisol," Investigative Ophthalmology and Visual Science, 28 (May, 1987). The authors suggest THF may be useful as an antiglaucoma agent. In U.S. Patent No. 4,863,912, issued to Southren et al. on September 5, 1989, pharmaceutical compositions containing THF and a method for using these compositions to control intraocular pressure are disclosed. THF has been disclosed as an angiostatic steroid in Folkman, et al., "Angiostatic Steroids," Ann. Surg., 206(3) (1987) wherein it is suggested angiostatic steroids may have potential use for diseases dominated by abnormal neovascularization, including diabetic retinopathy, neovascular glaucoma and retrolental fibroplasia.

US-Patent Nos. 5,371,078, 5,698,545 and 4,876,250 and WO 93/10141 disclose angiostatic steroids for use in controlling ocular hypertension as well as pharmaceutical compositions of these angiostatic steroids and methods for their use in treating ocular hypertension, including controlling the ocular hypertension associated with primary open angle glaucoma. None of these documents discloses that an angiostatic agent is useful in treating GLC1A glaucoma.

Steroids which inhibit angiogenesis are disclosed in WO 91/19731. This document also discloses that the steroids are useful in treating glaucoma. There is, however, no suggestion to use the compounds for treating GLC1A glaucoma.

Alward et al., The New England Journal of Medicine (1998) 338, 1022-1027, Stone et al., Science (1997) 275, 668-670 and Alward et al., Journal of Glaucoma (1996) 5, 276-284 show that there are several forms of primary open angle glaucoma of which GLC1A glaucoma is only a subgroup.

Summary of the Invention

The invention is directed to the use of angiostatic agents for the manufacture of a medicament for controlling GLC1A glaucoma.

Detailed Description of Preferred Embodiments

Agents which alter the expression of GLC1A in the glaucomatous eye are expected to lower IOP and thereby prevent or inhibit the glaucomatous optic neuropathy which is being driven by elevated IOP. Glucocorticoids upregulte GLC1A expression in the TM of certain individuals. There have been several reports of elevated levels of the natural glucocorticid cortisol in the aqueous humor and plasma of glaucoma patients (Schwartz, et al., supra; Rozsival, et al., supra). In addition, certain mutations in GLC1A may alter the expression of GLC1A in the TM tissue of 1q glaucoma patients. Unexpectedly, it has been discovered that angiostatic agents inhibit the expression of GLC1A in cultured human TM cells and lower elevated IOP in certain animal models of ocular hypertension. The compounds thereby prevent the expression of GLC1A and the subsequent development of ocular hypertension.

The development of blood vessels for the purpose of sustaining viable tissue is known as angiogenesis. Agents which inhibit angiogenesis are known by a variety of terms such as angiostatic, angiolytic or angiotropic agents. For purposes of this specification, the term "angiostatic agent" means compounds which can be used to inhibit angiogenesis.

The specific angiostatic agents of the present invention are steroids or steroid metabolites. For purposes herein, the term "angiostatic steroids" means steroids and steroid metabolites which inhibit angiogenesis. The present invention is based on the finding that angiostatic steroids can be used for the control of ocular hypertension. In particular, the agents can be used for the treatment of GLC1A glaucoma.

Preferred angiostatic steroids of the present invention have the following formula: wherein

• R1 is H, β-CH3 or β-C2H5;
• R2 is F, C9-C11 double bond, C9-C11 epoxy, H or Cl;
• R3 is H, OR26, OC(=O)R27, halogen, C9-C11 double bond, C9-C11 epoxy, =O, -OH, -O-alkyl(C1-C12), -OC(=O)alkyl(C1-C12), -OC(=O)ARYL, -OC(=O)N(R)2 or -OC(=O)OR7, wherein ARYL is furyl, thienyl, pyrrolyl, or pyridyl and each of said moieties is optionally substituted with one or two (C1-C4)alkyl groups, or ARYL is -(CH2)f-phenyl wherein f is 0 to 2 and the phenyl ring is optionally substituted with 1 to 3 groups selected from chlorine, fluorine, bromine, alkyl(C1-C3), alkoxy(C1-C3), thioalkoxy-(C1-C3), Cl3C-, F3C-, -NH2 and -NHCOCH3 and R is hydrogen, alkyl (C1-C4), or phenyl and each R can be the same or different, and R7 is ARYL as herein defined, or alkyl(C1-C12);
• R4 is H, CH3, Cl or F;
• R5 is H, OH, F, Cl, Br, CH3, phenyl, vinyl or allyl;
• R6 is H or CH3;
• R9 is CH2CH2OR26, CH2CH2OC(=O)R27, H, OH, CH3, F, =CH2, CH2C(=O)OR28, OR26, O(C=O)R27 or O(C=O)CH2(C=O)OR26
• R10 is -C≡CH, -CH=CH2, halogen, CN, N3, OR26, OC(=O)R27, H, OH, CH3 or R10 forms a second bond between positions C-16 and C-17;
• R12 is H or forms a double bond with R1 or R14;
• R13 is halogen, OR26, OC(=O)R27, NH2, NHR26, NHC(=O)R27, N(R26)2, NC(=O)R27, N3, H, -OH, =O, -O-P(=O)(OH)2, or -O-C(=O)-(CH2)tCOOH where t is an integer from 2 to 6;
• R14 is H or forms a double bond with R12;
• R15 is H, =O or -OH;
• and R23 with R10 forms a cyclic phosphate;
• wherein R9 and R15 have the meaning defined above;
• or wherein R23 is -OH, O-C(=O)-R11, -OP(O)-(OH)2, or -O-C(=O)-(CH2)tCOOH wherein t is an integer from 2 to 6; and R11 is -Y-(CH2)n-X-(CH2)m-SO3H,
• -Y'-(CH2)p-X'-(CH2)q-NR16R17 or -Z(CH2)rQ,
• wherein Y is a bond or -O-; Y' is a bond, -O-, or -S-; each of X and X' is a bond,-CON(R18)-, -N(R18)CO-, -O-, -S-, -S(O)-, or -S(O2)-; R18 is hydrogen or alkyl (C1-C4); each of R16 and R17 is a lower alkyl group of from 1 to 4 carbon atoms optionally substituted with one hydroxyl or R16 and R17 taken together with the nitrogen atom to which each is attached forms a monocyclic heterocycle selected from pyrrolidino, piperidino, morpholino, thiomorpholino, piperazino or N(lower)alkyl-piperazino wherein alkyl has from 1 to 4 carbon atoms; n is an integer of from 4 to 9; m is an integer of from 1 to 5; p is an integer of from 2 to 9; q is an integer of from 1 to 5;
• Z is a bond or -O-; r is an integer of from 2 to 9; and Q is one of the following: (1) -R19-CH2COOH wherein R19 is -S-, -S(O)-, -S(O)2-, -SO2N(R20)-, or N(R20)SO2-; and R20 is hydrogen or lower alkyl-(C1-C4); with the proviso that the total number of carbon atoms in R20 and (CH2)r is not greater than 10; or(2) -CO-COOH; or(3) CON(R21)CH(R22)COOH wherein R21 is H and R22 is H, CH3, -CH2COOH, -CH2CH2COOH, -CH2OH, -CH2SH, -CH2CH2SCH3, or -CH2Ph-OH wherein Ph-OH is p-hydroxyphenyl; or R21 is CH3 and R22 is H; or R21 and R22 taken together are -CH2CH2CH2-; or -N(R21)CH(R22)COOH taken together is -NHCH2CONHCH2COOH; and pharmaceutically acceptable salts thereof; with the proviso that if R23 is a phosphate, it must form a cyclic phosphate, with R10 when R13 is = O, except for the compound wherein R1 is β-CH3, R2 and R3 taken together form a double bond between positions 9 and 11, R4 and R6 are hydrogen, R12 and R14 taken together form a double bond between positions 4 and 5, R5 is ∝-F, R9 is β-CH3, R10 is ∝-OH, R13 and R15 are =O andR23 is -OP(O)-(OH)2.R24 = C, C1-C2 double bond, O;R25 = C(R15)CH2-R23, OH, OR26, OC(=O)R27, R26, COOH, C(=O)OR26, CHOHCH2OH, CHOHCH2OR26, CHOHCH2OC(=O)R27, CH2CH2OH, CH2CH2OR26, CH2CH2OC(=O)R27, CH2CN, CH2N3, CH2NH2, CH2NHR26, CH2N(R26)2, CH2OH, CH2OR26, CH2O(C=O)R27, CH2O(P=O)(OH)2, CH2O(P=O) (OR26)2, CH2SH, CH2S-R26, CH2SC(=O)R27, CH2NC(=O)R27, C(=O)CHR28OH, C(=O)CHR28OR26, C(=O)CHR28OC(=O)R27 or R10 and R25 taken together may be =C(R28)2, that is, an optionally alkyl substituted methylene group;

   wherein R₂₆ = C₁-C₆ (alkyl, branched alkyl, cycloalkyl, haloalkyl, aralkyl, aryl); R₂₇ = R₂₆ + OR₂₆; R₂₈ = H, C₁-C₆ (alkyl, branched alkyl, cycloalkyl).

Unless specified otherwise, all substituent groups attached to the cyclopentanophenanthrene moiety of Structures [A] and [B] may be in either the alpha or beta position. Additionally, the above structures include all pharmaceutically acceptable salts of the angiostatic steroids.

Preferred angiostatic steroids are:

The more preferred compounds are 21-methyl-5β-pregnan-3∝, 11β, 17∝,21-tetrol 20-one-21-methyl ether; 3β-azido-21-acetoxy-5β-pregnan-11β, 17∝-diol-20-one; 3β-acetamido-21-acetoxy-5β-pregnan-11β, 17∝-diol-20-one; and 5β-pregnan-11β,17∝, 21-triol-20-one. The most preferred compounds are 4,9(11)-pregnadien-17∝,21-diol-3,20-dione-21-acetate and 4,9(11)-pregnadien-17∝,21-diol-3,20-dione.

The angiostatic steroids of the present invention may be incorporated in various formulations for delivery to the eye. For example, topical formulations can be used and can include ophthalmologically acceptable preservatives, surfactants, viscosity enhancers, buffers, sodium chloride and water to form aqueous sterile ophthalmic solutions and suspensions. In order to prepare sterile ophthalmic ointment formulations, an angiostatic steroid is combined with a preservative in an appropriate vehicle, such as mineral oil, liquid lanolin or white petrolatum. Sterile ophthalmic gel formulations comprising the angiostatic steroids of the present invention can be prepared by suspending an angiostatic steroid in a hydrophilic base prepared from a combination of, for example, Carbopol-940 (a carboxyvinyl polymer available from the B.F. Goodrich Company) according to published formulations for analogous ophthalmic preparations. Preservatives and tonicity agents may also be incorporated in such gel formulations.

The specific type of formulations selected will depend on various factors, such as the angiostatic steroid or its salt being used, and the dosage frequency. Topical ophthalmic aqueous solutions, suspensions, ointments and gels are the preferred dosage forms. The angiostatic steroid will normally be contained in these formulations in an amount of from about 0.005 to about 5.0 weight percent (wt.%). Preferable concentrations range from about 0.05 to about 2.0 wt.%. Thus, for topical administration, these formulations are delivered to the surface of the eye one to four times per day, depending upon the routine discretion of the skilled clinician.

The following examples illustrate formulations and synthesis of compounds of the present invention, but are in no way limiting.

Example 1

Component	wt.%
Angiostatic Steroid	0.005-5.0
Tyloxapol	0.01-0.05
HPMC	0.5
Benzalkonium Chloride	0.01
Sodium Chloride	0.8
Edetate Disodium	0.01
NaOH/HCl	q.s. pH 7.4
Purified Water	q.s. 100 mL

Example 2

Component	wt.%
4,9(11)-pregnadien-17∝,21-diol-3,20-dione-21-acetate	1.0
Mannitol	2.40
Carbopol 974P	0.50
Polysorbate 80	0.05
Benzalkonium Chloride	0.01
Sodium Chloride	0.4
Edetate Disodium	0.01
NaOH/HCl	q.s. pH 7.4
Purified Water	q.s. 100 mL

Example 3 Preparation of 5β-Pregnan-11β, 17∝, 21-triol-20-one Tetrahydrocortisol-F-21-t-butyldiphenylsilyl ether (PS03842)

A solution of 4.75 g (17.3 mmol) of t-butyldiphenylchlorosilane in 5 mL of dry DMF was added dropwise to a stirred solution of 5.7 g (15.6 mmol) of tetrahydrocortisol-F (Steraloids No. P9050) and 2.3 g (19 mmol) of 4-dimethylaminopyridine (DMAP) in 30 mL of dry DMF, under N₂, at -25 to -30°C (maintained with CO₂ - MeCN). After a further 20 min at -30°C, the mixture was allowed to warm to 23°C overnight.

The mixture was partitioned between ether and water, and the organic solution was washed with brine, dried (MgSO₄), filtered and concentrated to give 10.7 g of a white foam.

This material was purified by flash column chromatography (400 g silica; 62.5 to 70% ether/hexane). The 3-siloxy isomer eluted first, followed by mixed fractions, followed by the title compound. The concentrated mixed fractions (4.0 g) were chromatographed on the same column with 35% ethyl acetate/hexane. The total yield of the 3-siloxy isomer was 0.42 g (5%), and of the title compound, 5.05 g (53.5%). Continued elution with 25% MeOH/EtOAc allowed recovery of unreacted tetrahydrocortisol-F.

PSO3842

NMR (200 MHz ¹H) (CDCl₃): δ0.63 (s, 3H, Me-18); 1.11 (s, 9H, t-Bu); 1.12 (s, 3H, Me-19); 2.57 (t, J=13, 1H, H-8); 2.6 (s, 1H, OH-17); 3.63 (sept, J=2.5, 1H, H-3); 4.15 (br s, 1H, H-11); 4.37 and 4.75 (AB, J=20, 2H, H-21); 7.4 (m, 6H) and 7.7 (m, 4H) (Ph₂). NMR (200 MHz ¹H) (DMSO-d₆): δ0.64 (s, 3H, Me-18); 1.02 (s, 9H, t-Bu); 1.07 (s, 3H, Me-19); 2.50 (t, J=13, 1H, H-8); 3.37 (m, 1H, H-3); 3.94 (d, J=2, 1H, OH-11); 4.00 (br s, 1H, H-11); 4.42 (d, J=5, 1H, OH-3); 4.38 and 4.83 (AB, J=20, 2H, H-21); 5.11 (s, 1H, OH-17); 7.45 (m, 6H) and 7.6 (m, 4H) (Ph₂). NMR (50.3 - MHz ¹³C) (CDCl₃): 17.4 (C-18); 19.3 (C-16); 23.7 (C-15); 26.3 (C-7); 26.6 (C-19); 26.8 (Me ₃C); 27.2 (C-6); 30.9 (C-2); 31.5 (C-8); 34.1 (Me₃ C); 34.8 (C-10); 35.2 (C-1); 36.2 (C-4); 39.7 (C-13); 43.5 (C-5); 44.3 (C-9); 47.4 (C-12); 52.1 (C-14); 67.8 (C-11); 68.9 (C-21); 71.7 (C-3); 89.8 (C-14); 127.8, 129.8, 132.8, 132.9, 135.7, 135.8 (diastereotopic Ph₂); 208.8 (C-20). Underlined resonances showed inversion in the APT experiment. Assignments: E. Breitmaier, W. Voelter "Carbon-13 NMR Spectroscopy," 3d ed., VCH, 1987; pp. 345-348.

IR (KBr) 3460, 2930, 2860, 1720, 1428, 1136, 1113, 1070, 1039, 703 cm^-1.

This compound did not show a sharp melting point but turned to a foam at 80-100°C. Numerous attempts at recrystallization failed.

5β-Pregnan-11β, 17∝, 21-triol-20-one

A solution of PSO3842 (0.91 g, 1.50 mmol) and thiocarbonyl diimidazoie (1.05 g, 5.9 mmol) in 8 mL of anhydrous dioxane was refluxed under N₂ for 3.5 h. The cooled solution was partitioned between ether and water and the organic solution was washed with brine, dried (MgSO₄), filtered and concentrated. The residue was chromatographed (120 g SiO₂, 35% EtOAc/hexane) giving 0.86 g (80%) of the imidazolyl thioester.

A solution of 0.75 g (1.05 mmol) of this compound in 100 mL of anhydrous dioxane was added dropwise over 2.2 h to a rapidly stirred, refluxing solution of 1.6 mL (5.9 mmol) of Bu₃SnH in 100 mL of anhydrous dioxane under N₂. After a further 1 h at reflux, the solution was cooled, concentrated and the residue chromatographed (200 g SiO₂, 9% EtOAc/hexane) giving 0.43 g (70%) of the 3-deoxy-21-silyl ether. This material was dissolved in 20 mL of methanol; Bu₄NF·3H₂O (0.50 g, 1.6 mmol) was added, and the mixture was heated to reflux under N₂ for 4 h. The cooled solution was diluted with 2 volumes of EtOAc, concentrated to 1/4 volume, partitioned (EtOAc/H₂O), and the organic solution was washed with brine, dried (MgSO₄), filtered and concentrated. The residue (0.40 g) was chromatographed (30 g SiO₂, 40% EtOAc/hexane) to give 0.25 g (98%) of an oil.

This oil was crystallized (n-BuCl) to afford 0.14 g of the title compound as a white solid, m.p. 167-170°C.

IR (KBr): 3413 (br), 2934, 1714, 1455, 1389, 1095, 1035 cm^-1.

MS (Cl): 351 (M+1).

NMR (200 MHz ¹H, DMSO-d₆): δ0.69 (s, 3H, Me-18); 1.14 (s, 3H, Me-19); 0.8-2.0 (m); 2.5 (t, J=13, 1H, H-8); 3.96 (d, J=2, 1H, OH-11); 4.1 (br s, 1H, H-11); 4.1 and 4.5 (AB, further split by 5 Hz, 2H, H-21); 4.6 (t, J=5,1H, OH-21); 5.14 (s, 1H, OH-17).

Anal.  Calc'd for C₂₁H₃₄O₄: C, 71.96; H, 9.78.       Found: C, 71.69; H, 9.66.

Example 4 Preparation of 21-Methyl-5β-pregnan-3∝, 11β, 17∝, 21-tetrol-20-one 21-methyl ether

Sodium hydride (60% oil dispersion, 0.10 g, 2.5 mmol) was added to a stirred solution of tetrahydrocortisol-F (0.73 g, 2.0 mmol) and CH₃I (0.60 mL, 9.6 mmol) in 8 mL of anhydrous DMF under N₂. Hydrogen was evolved, and the temperature rose to 35°C. After 1 h, the mixture was diluted with EtOAc, extracted with water (until neutral) and brine, dried (MgSO₄), filtered and concentrated. The residue was chromatographed (70 g SiO₂, 80% EtOAc/hexane) to give 0.17 g of a white solid, MS (Cl) = 395 (M +1). This material was recrystallized (EtOAc-n-BuCl) to afford 0.12 g (16%) of the title compound as a feathery white solid, m.p. 208-213 °C.

IR (KBr): 3530, 3452, 2939, 2868, 1696 (s, CO), 1456, 1366, 1049 cm^-1.

NMR (200 MHz ¹H, DMSO-d₆): δ0.74 (s, 3H, Me-18); 1.09 (s, 3H, Me-19); 1.14 (d, J=6.6, 3H, C-21 Me); 0.8-2.0 (m); 2.47 (t, J=13, 1H, H-8); 3.18 (s, 3H, OMe); 3.35 (m, 1H, H-3); 4.00 (d, J=2, 1H, OH-11); 4.07 (brs, 1H, H-11); 4.37 (q, J=6.6, 1H, H-21); 4.43 (d, J=5, 1H, OH-3); 5.16 (s, 1H, OH-17).

Anal.   Calc'd for C₂₃H₃₈O₅: C, 70.01; H, 9.71.       Found: C, 70.06; H, 9.76.

Example 5 Preparation of 3β-Azido-21-acetoxy-5β-pregnan-11β, 17∝-diol-20-one

A solution of triphenylphosphine (2.6 g, 10 mmol) in 10 mL of toluene was carefully added to a stirred solution of PS03842 (see Example 4) (1.75 g, 2.90 mmol), diphenylphosphoryl azide (2.2 mL, 10.2 mmol) and diethyl azodicarboxylate (1.55 mL, 10 mmol) under N₂, keeping the internal temperature below 35°C (exothermic). The solution was stirred for 1.2 h, then diluted with ether, washed with water and brine, dried (MgSO₄), filtered and concentrated and the residue (9.5 g, oil) chromatographed 175 g SiO₂, 15% EtOAc/hexane) giving 1.83 g of a viscous oil.

A solution of 1.73 g of this material and 1.75 g (5.5 mmol) of Bu₄NF·3H₂O in 20 mL of methanol was refluxed under N₂ for 2.5 h. The crude product (1.94 g) was isolated with ethyl acetate and chromatographed (100 g SiO₂, 50% EtOAc/hexane) giving 0.60 g (56%) of a white semisolid. Trituration (4:1 hexane-ether) gave 0.57 g (53%) of a solid.

A stirred solution of 0.40 g of this material in 3 mL of dry pyridine was treated with 0.3 mL of acetic anhydride and stirred overnight at 23°C under N₂. The mixture was quenched with 1 mL of methanol, stirred for 15 min, diluted with ether, washed with 1 M aqueous HCI, water (until neutral), brine, dried (MgSO4), filtered and concentrated. The residue (0.41 g, oil) was chromatographed (35 g SiO₂, 33% EtOAc/hexane) to afford 0.33 g (76%) of the title compound as a white foam, m.p. 80-90°C (dec).

IR (KBr): 3505, 2927, 2866, 2103 (vs), 1721 (sh 1730), 1268, 1235 cm^-1.

NMR (200 MHz ¹H, CDCl₃): δ0.92 (s, 3H, Me-18); 1.21 (s, 3H, Me-19); 1.0-2.1 (m); 2.17 (s, 3H, Ac); 2.25 (s 1H, OH-17); 2.74 (m, 1H, H-8); 3.97 (br s, 1H, H-3); 4.31 (br s, 1H, H-11); 4.94 (AB, J=17, Δν=60, 2H, H-21).

Anal.   Calc'd for C₂₃H₃₅N₃O₅: C, 63.72; H, 8.14; N, 9.69.       Found: C, 63.39; H, 8.18; N, 9.45.

Example 6 Preparation of 3β-Acetamido-21-acetoxy-5β-pregnan-11β, 17∝-diol-20-one

A solution of 3β-azido-21-acetoxy-5β-pregnan-11β,17∝-diol-20-one (0.15 g, 0.35 mmol) in 8 mL of absolute ethanol containing 0.03 g of 10% Pd on C was stirred under H₂ ( 1 atm) at 23°C for 2 h. The mixture was filtered and concentrated, the residue dissolved in EtOAc, the basic material extracted into 1 M aqueous HCl, liberated (Na₂CO₃), extracted (EtOAc) and the organic extract washed with water (until neutral) and brine, dried (MgSO₄), filtered and concentrated to provide 58 mg of a solid.

This material was acetylated (1.0 mL of dry pyridine, 0.20 mL of Ac₂O, 23°C, N₂, overnight), followed by workup (as described for the steroid of Example 6 [last step]) affording a crude product that was chromatographed (25 g SiO₂, EtOAc). This product was triturated with ether to afford 51 mg (33%) of product as a white solid, m.p. 179-181°C.

Ms (Cl, isobutane): (M +1) = 450 (M⁺), 432, 391, 371, 348.

IR (KBr): 3398 (br), 2932, 2865, 1720 (sh. 1740), 1652, 1538, 1375, 1265, 1236 cm^-1.

NMR (200 MHz ¹H, CDCl₃): δ0.89, 1.22, 1.99, 2.17 (all s, 3H); 1.0-2.2(m); 2.7 (t, J=13, 1H, H-8); 3.03 (s, 1H, OH-17); 4.2 (br s, 1H, H-11); 4.3 (br s, 1H, H-3); 4.96 (AB, J=17.5, Δν=42, 2H, H-21); 5.8 (d, J=10, 1H, NH).

Claims (4)

1. Use of an angiostatic agent for the manufacture of a medicament for treating GLC1A glaucoma.
2. Use of Claim 1 wherein the angiostatic agent has the following structure: wherein

   R₁ is H, β-CH₃ or β-C₂H₅;

   R₂ is F, C₉-C₁₁ double bond, C₉-C₁₁ epoxy, H or Cl;

   R₃ is H, OR₂₆, OC(=O)R₂₇, halogen, C₉-C₁₁ double bond, C₉-C₁₁ epoxy, =O, -OH, -O-alkyl(C₁-C₁₂), -OC(=O)alkyl(C₁-C₁₂), -OC(=O)ARYL, -OC(=O)N(R)₂ or -OC(=O)OR₇, wherein ARYL is furyl, thienyl, pyrrolyl, or pyridyl and each of said moieties is optionally substituted with one or two (C₁-C₄)alkyl groups, or ARYL is -(CH₂)_f-phenyl wherein f is 0 to 2 and the phenyl ring is optionally substituted with 1 to 3 groups selected from chlorine, fluorine, bromine, alkyl(C₁-C₃), alkoxy(C₁-C₃), thioalkoxy-(C₁-C₃), Cl₃C-, F₃C-, -NH₂ and -NHCOCH₃ and R is hydrogen, alkyl (C₁-C₄), or phenyl and each R can be the same or different, and R₇ is ARYL as herein defined, or alkyl(C₁-C₁₂);

   R₄ is H, CH₃, Cl or F;

   R₅ is H, OH, F, Cl, Br, CH₃, phenyl, vinyl or allyl;

   R₆ is H or CH₃;

   R₉ is CH₂CH₂OR₂₆, CH₂CH₂OC(=O)R₂₇, H, OH, CH₃, F, =CH₂, CH₂C(=O)OR₂₈., OR₂₆, O(C=O)R₂₇ or O(C=O)CH₂(C=O)OR₂₆

   R₁₀ is -C≡CH, -CH=CH₂, halogen, CN, N₃, OR₂₆, OC(=O)R₂₇, H, OH, CH₃ or R₁₀ forms a second bond between positions C-16 and C-17;

   R₁₂ is H or forms a double bond with R₁ or R₁₄;

   R₁₃ is halogen, OR₂₆, OC(=O)R₂₇, NH₂, NHR₂₆, NHC(=O)R₂₇, N(R₂₆)₂, NC(=O)R₂₇, N₃, H, -OH, =O, -O-P(=O)(OH)₂, or -O-C(=O)-(CH₂)_tCOOH where t is an integer from 2 to 6;

   R₁₄ is H or forms a double bond with R₁₂;

   R₁₅ is H, =O or -OH;

   and R₂₃ with R₁₀ forms a cyclic phosphate;

   wherein R₉ and R₁₅ have the meaning defined above;

   or wherein R₂₃ is -OH, O-C(=O)-R₁₁, -OP(O)-(OH)₂, or -O-C(=O)-(CH₂)_tCOOH wherein t is an integer from 2 to 6; and R₁₁ is -Y-(CH₂)_n-X-(CH₂)_m-SO₃H, -Y'-(CH₂)_p-X'-(CH₂)_q-NR₁₆R₁₇ or -Z(CH₂)_rQ,

   wherein Y is a bond or -O-; Y' is a bond, -O-, or -S-; each of X and X' is a bond,-CON(R₁₈)-, -N(R₁₈)CO-, -O-, -S-, -S(O)-, or -S(O₂)-; R₁₈ is hydrogen or alkyl (C₁-C₄); each of R₁₆ and R₁₇ is a lower alkyl group of from 1 to 4 carbon atoms optionally substituted with one hydroxyl or R₁₆ and R₁₇ taken together with the nitrogen atom to which each is attached forms a monocyclic heterocycle selected from pyrrolidino, piperidino, morpholino, thiomorpholino, piperazino or N(lower)alkyl-piperazino wherein alkyl has from 1 to 4 carbon atoms; n is an integer of from 4 to 9; m is an integer of from 1 to 5; p is an integer of from 2 to 9; q is an integer of from 1 to 5;

   Z is a bond or -O-; r is an integer of from 2 to 9; and Q is one of the following:

   (1) -R₁₉-CH₂COOH wherein R₁₉ is -S-, -S(O)-, -S(O)₂-, -SO₂N(R₂₀)-, or N(R₂₀)SO₂-; and R₂₀ is hydrogen or lower alkyl-(C₁-C₄); with the proviso that the total number of carbon atoms in R₂₀ and (CH₂)_r is not greater than 10; or

   (2) -CO-COOH; or

   (3) CON(R₂₁)CH(R₂₂)COOH wherein R₂₁ is H and R₂₂ is H, CH₃, -CH₂COOH, -CH₂CH₂COOH, -CH₂OH, -CH₂SH, -CH₂CH₂SCH₃, or -CH₂Ph-OH wherein Ph-OH is p-hydroxyphenyl; or R₂₁ is CH₃ and R₂₂ is H; or R₂₁ and R₂₂ taken together are -CH₂CH₂CH₂-; or -N(R₂₁)CH(R₂₂)COOH taken together is -NHCH₂CONHCH₂COOH; and pharmaceutically acceptable salts thereof; with the proviso that if R₂₃ is a phosphate, it must form a cyclic phosphate, with R₁₀ when R₁₃ is = O, except for the compound wherein R₁ is β-CH₃, R₂ and R₃ taken together form a double bond between positions 9 and 11, R₄ and R₆ are hydrogen, R₁₂ and R₁₄ taken together form a double bond between positions 4 and 5, R₅ is ∝-F, R₉ is β-CH₃, R₁₀ is ∝-OH, R₁₃ and R₁₅ are =O and R₂₃ is -OP(O)-(OH)₂.

   R₂₄ = C, C₁-C₂ double bond, O;

   R₂₅ = C(R₁₅)CH₂-R₂₃, OH, OR₂₆, OC(=O)R₂₇, R₂₆, COOH, C(=O)OR₂₆, CHOHCH₂OH, CHOHCH₂OR₂₆, CHOHCH₂OC(=O)R₂₇, CH₂CH₂OH, CH₂CH₂OR₂₆, CH₂CH₂OC(=O)R₂₇, CH₂CN, CH₂N₃, CH₂NH₂, CH₂NHR₂₆, CH₂N(R₂₆)₂, CH₂OH, CH₂OR₂₆, CH₂O(C=O)R₂₇, CH₂O(P=O)(OH)₂, CH₂O(P=O) (OR₂₆)₂, CH₂SH, CH₂S-R₂₆, CH₂SC(=O)R₂₇, CH₂NC(=O)R₂₇, C(=O)CHR₂₈OH, C(=O)CHR₂₈OR₂₆, C(=O)CHR₂₈OC(=O)R₂₇ or R₁₀ and R₂₅ taken together may be =C(R₂₈)₂, that is, an optionally alkyl substituted methylene group;

      wherein R₂₆ = C₁-C₆ (alkyl, branched alkyl, cycloalkyl, haloalkyl, aralkyl, aryl);    R₂₇ = R₂₆ + OR₂₆; R₂₈ = H, C₁-C₆ (alkyl, branched alkyl, cycloalkyl).
3. Use of Claim 2 wherein the compound is selected from the group consisting of 21-methyl-5β-pregnan-3∝,11β, 17∝, 21-tetrol-20-one 21-methyl ether; 3β-azido-21-acetoxy-5β-pregnan-11β, 17∝-diol-20-one; 3β-acetamido-21-acetoxy-5β-pregnan-11β, 17∝-diol-20-one; 5β-pregnan-11β, 17∝, 21-triol-20-one; 4, 9(11)-pregnadien-17∝,21-diol-3,20-dione-21-acetate and 4,9(11)-pregnadien-17∝,21-diol-3,20-dione.
4. Use of Claim 3 wherein the compound is selected from the group consisting of 4, 9(11)-pregnadien-17∝,21-diol-3,20-dione-21-acetate and 4, 9(11)-pregnadien-17∝,21-diol-3,20-dione.