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• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
  • C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
  • C07D487/04—Ortho-condensed systems
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
  • A61K31/50—Pyridazines; Hydrogenated pyridazines
  • A61K31/5025—Pyridazines; Hydrogenated pyridazines ortho- or peri-condensed with heterocyclic ring systems
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
  • A61P35/02—Antineoplastic agents specific for leukemia
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
  • A61P35/04—Antineoplastic agents specific for metastasis
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
  • C07D413/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing three or more hetero rings

Definitions

• JAK2 Janus kinase 2
• JAK2 has a pivotal role in the erythropoietin (EPO) signaling pathway, including erythrocyte differentiation and Stat5 activation.
• EPO erythropoietin
• Recent studies have demonstrated that patients with chronic myeloproliferative disorders such as polycythemia vera, essential thrombocytosis, and myelosclerosis with myeloid metaplasia and thrombotic disorders such as activated protein C resistance, splanchnic vein thrombosis, Budd-Chiari Syndrome, and portal vein thrombosis frequently have acquired activating mutations in JAK2.
• mutant JAK2 leads to constitutive tyrosine phosphorylation activity, by an unknown mechanism.
• the constitutive activity of mutant JAK2 leads to increased levels of phosphorylated JAK2, pSTAT5, and STAT5 transcriptional activity, which leads to the pathogenesis of myeloproliferative disorders and leukemias, such as atypical chronic myeloid leukemia.
• JAK2 is activated by interleukin-6-depedent autocrine loop or other genetic alterations in solid and hematologic tumors, e.g., glioblastoma, breast cancer, multiple myeloma, prostate cancer, primary and secondary acute myeloid leukemia, T-lineage and B-lineage acute lymphoblastic leukemia, myelodysplasia syndrome.
• interleukin-6-depedent autocrine loop or other genetic alterations in solid and hematologic tumors, e.g., glioblastoma, breast cancer, multiple myeloma, prostate cancer, primary and secondary acute myeloid leukemia, T-lineage and B-lineage acute lymphoblastic leukemia, myelodysplasia syndrome.
• the present invention provides a novel amino pyrazole compound believed to have clinical use for treatment of myeloproliferative disorders in which the JAK2 signaling pathway is activated or in which JAK/STAT signaling is dysregulated.
• the present invention provides 3-(4-chloro-2-fluorobenzyl)-2-methyl-N-(5-methyl-1H-pyrazol-3-yl)-8-(morpholinomethyl)imidazo[1,2-b]pyridazin-6-amine or a pharmaceutically acceptable salt thereof.
• the present invention provides a method of treating chronic myeloproliferative disorders selected from the group consisting of polycythemia vera, essential thrombocytosis, and myelosclerosis with myeloid metaplasia in a mammal comprising administering to a mammal in need of such treatment an effective amount of 3-(4-chloro-2-fluorobenzyl)-2-methyl-N-(5-methyl-1H-pyrazol-3-yl)-8-(morpholinomethyl)imidazo[1,2-b]pyridazin-6-amine or a pharmaceutically acceptable salt thereof.
• the present invention also provides a method of treating glioblastoma, breast cancer, multiple myeloma, prostate cancer, and leukemias, such as atypical chronic myeloid leukemia, primary and secondary acute myeloid leukemia, T-lineage and B-lineage acute lymphoblastic leukemia, myelodysplasia syndrome, and myeloproliferative disorders in a patient comprising administering to a patient in need of such treatment an effective amount of 3-(4-chloro-2-fluorobenzyl)-2-methyl-N-(5-methyl-1H-pyrazol-3-yl)-8-(morpholinomethyl)imidazo[1,2-b]pyridazin-6-amine or a pharmaceutically acceptable salt thereof.
• leukemias such as atypical chronic myeloid leukemia, primary and secondary acute myeloid leukemia, T-lineage and B-lineage acute lymphoblastic leukemia, myelodysplasia syndrome, and myeloprolif
• the present invention also provides a pharmaceutical composition
• a pharmaceutical composition comprising 3-(4-chloro-2-fluorobenzyl)-2-methyl-N-(5-methyl-1H-pyrazol-3-yl)-8-(morpholinomethyl)imidazo[1,2-b]pyridazin-6-amine or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier, diluent or excipient.
• This invention also provides 3-(4-chloro-2-fluorobenzyl)-2-methyl-N-(5-methyl-1H-pyrazol-3-yl)-8-(morpholinomethyl)imidazo[1,2-b]pyridazin-6-amine or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier, diluent or excipient in combination with another therapeutic ingredient.
• This invention also provides 3-(4-chloro-2-fluorobenzyl)-2-methyl-N-(5-methyl-1H-pyrazol-3-yl)-8-(morpholinomethyl)imidazo[1,2-b]pyridazin-6-amine or a pharmaceutically acceptable salt thereof for use as a medicament. Additionally, this invention provides use of 3-(4-chloro-2-fluorobenzyl)-2-methyl-N-(5-methyl-1H-pyrazol-3-yl)-8-(morpholinomethyl)imidazo[1,2-b]pyridazin-6-amine or a pharmaceutically acceptable salt thereof in the manufacture of a medicament for treating chronic myeloproliferative disorders.
• these chronic myeloproliferative disorders are selected from the group consisting of polycythemia vera, essential thrombocytosis, and myelosclerosis with myeloid metaplasia.
• this invention provides a pharmaceutical composition for treating chronic myeloproliferative disorders selected from the group consisting of polycythemia vera, essential thrombocytosis, and myelosclerosis with myeloid metaplasia comprising 3-(4-chloro-2-fluorobenzyl)-2-methyl-N-(5-methyl-1H-pyrazol-3-yl)-8-(morpholinomethyl)imidazo[1,2-b]pyridazin-6-amine or a pharmaceutically acceptable salt thereof as an active ingredient.
• the compound of the present invention is capable of forming salts.
• the compound of the present invention is an amine, and accordingly reacts with any of a number of inorganic and organic acids to form pharmaceutically acceptable acid addition salts.
• Such pharmaceutically acceptable acid addition salts and common methodology for preparing them are well known in the art. See, e.g., P. Stahl, et al., HANDBOOK OF PHARMACEUTICAL SALTS: PROPERTIES, SELECTION AND USE, (VCHA/Wiley-VCH, 2002); L. D. Bighley, S. M. Berge, D. C. Monkhouse, in “Encyclopedia of Pharmaceutical Technology’. Eds. J. Swarbrick and J. C.
• dimethicone during blending via a liquid addition system.
• JAK2 EPO-TF1/pSTAT5 cell-based assay mimics the constitutive activation of JAK2-STAT5 in erythroid progenitor cells, which drives the overproduction of red blood cells, a marker of polycythemia vera (PV).
• PV polycythemia vera
• TF-1 human erythroid leukemia
• RPMI-1640 was developed by Moore et. al. at Roswell Park Memorial Institute. The formulation is based on the RPMI-1630 series of media utilizing a bicarbonate buffering system and alterations in the amounts of amino acids and vitamins.) with 10% fetal bovine serum (FBS), 0.075% sodium bicarbonate, 1 mM sodium pyruvate, 1 ⁇ antibiotic/antimycotic (Invitrogen, Carlsbad, Calif.) and 0.45% glucose.
• FBS fetal bovine serum
• the medium is supplemented with GM-CSF (granulocyte-macrophage colony-stimulating factor) at a final concentration of 2 ng/mL. Cells are kept at 37° C.
• GM-CSF granulocyte-macrophage colony-stimulating factor
• RPMI 1640 RPMI 1640 with 0.075% sodium bicarbonate, 1 mM sodium pyruvate, 1 ⁇ antibiotic/antimycotic, and 0.45% glucose
• the diluted cells are added back to tissue culture flasks and incubated overnight at 37° C. Test compounds are prepared in 100% DMSO at 10 mM concentration.
• EPO Erythropoietin
• EPO medium is added into each well and the plate is vortexed.
• Cells are incubated in a 37° C. water bath for 20 min and mixed every 5 min during the incubation time.
• Final 10 point concentration-response range is 20 ⁇ M-1 nM at a final concentration of DMSO at 0.5% and EPO at 1.6 U/mL.
• 500 ⁇ L of 1% formaldehyde solution (made freshly with phosphate-buffered saline (PBS) and kept warm at 37° C.) is added to each well. Plates are sealed and inverted 8-10 times to mix. Plates are placed in a 37° C. water bath for 10 min.
• cell plates are spun at 1200 rpm for 5 min at room temperature (RT). The supernatant is aspirated, leaving 100 ⁇ L of cells (2 ⁇ 10 5 cells). The cells are vortexed and washed twice with 800 ⁇ L of PBS by repeating the spin steps and leaving 100 ⁇ L containing ⁇ 2 ⁇ 10 5 cells after the final wash. An aliquot of 800 ⁇ L of cold 90% methanol is added to the cells and placed at ⁇ 20° C. overnight. Plates are spun and methanol is removed. Cells are washed with FACS buffer (PBS with 5% FBS and 0.02% sodium azide).
• FACS buffer PBS with 5% FBS and 0.02% sodium azide
• IL-2 activates the JAK3 pathway in natural killer (NK) cells to drive the NK and CD8 lymphocyte proliferation. Therefore, IL-2 stimulated NK92/pSTAT5 cell-based assay enables the evaluation of the JAK3 cellular activity of JAK2 compounds in vitro.
• NK-92 (natural killer) cells are maintained in minimum essential medium (MEM) Alpha with 15% fetal bovine serum, 15% Horse Serum and 1 ⁇ antibiotic/antimycotic (Invitrogen, Carlsbad, Calif.). The medium is supplemented with IL-2 (R&D systems, Minneapolis, Minn.) for a final concentration of 4 ng/mL. Cells are kept at 37° C. with 5% CO 2 . Cells are starved in serum free medium to remove endogenous growth factors. NK-92 cells are counted and collected to seed 2 ⁇ 10 7 cells per 96-well plate at a density of 2 ⁇ 10 5 cells per well.
• MEM minimum essential medium
• IL-2 R&D systems, Minneapolis, Minn.
• the cells are rinsed twice with unsupplemented MEM Alpha (MEM Alpha) before suspending cells at a final concentration of 8 ⁇ 10 5 cells/mL in MEM Alpha with 0.6% serum (0.3% FBS, 0.3% horse serum).
• MEM Alpha unsupplemented MEM Alpha
• the diluted cells are added back to tissue culture flasks and incubated overnight at 37° C.
• Test compounds are prepared in 100% DMSO at 10 mM concentration.
• Compounds are serially diluted 1:3 with 100% DMSO in a 10 point-200 ⁇ concentration-response range (4 mM-200 nM).
• 2.5 ⁇ L of 200 ⁇ compound solution is added to 125 ⁇ L of 10% FBS complete RPMI 1640 medium for a 4 ⁇ concentration compound plate.
• serum-starved cells are collected and washed once with unsupplemented RPMI 1640 medium.
• Cells are suspended in 10% FBS complete RPMI 1640 medium for a final concentration of 8 ⁇ 10 5 cells/mL.
• An aliquot of 250 ⁇ L of diluted cells (2 ⁇ 10 5 cells) is added to each well in the 4 ⁇ concentration compound plate.
• Cells are mixed by vortexing and the plate is incubated in a 37° C. water bath for 10 min.
• a fresh 4 ⁇ working solution of IL-2 at 2 ng/mL is prepared using pre-warmed 10% FBS complete RPMI medium. After the cells are treated with compound for 10 min, 125 ⁇ L of IL-2 medium is added into each well. Cells are mixed by vortexing.
• the supernatant is aspirated, leaving 100 ⁇ L of cells (2 ⁇ 10 5 cells).
• the cells are vortexed and washed twice with 800 ⁇ L of PBS by repeating the spin steps and leaving 100 ⁇ L containing ⁇ 2 ⁇ 10 5 cells after the final wash.
• An aliquot of 800 ⁇ L of cold 90% methanol is added to the cells and placed at ⁇ 20° C. overnight. Plates are spun and methanol is removed. Cells are washed with FACS buffer (PBS with 5% FBS and 0.02% sodium azide).
• Cells are washed with PBS, and 50 ⁇ L of Cytofix® (BD Biosciences, San Jose, Calif.) is added to the cells. The cells are transferred to 96 well black tissue culture plates and sealed. The plates are spun down. Mean fluorescent intensity data are collected and analyzed using Cellomics Arrayscan® VTi. Compound treatment is compared to the vehicle to determine percent inhibition data. The MSR is determined to be 2.06. The relative IC 50 is calculated using a 4 parameter logistic curve fitting analysis with ActivityBase 4.0.
• the ratio of JAK3/JAK2 was determined to be 28.5 fold, which demonstrates 3-(4-chloro-2-fluorobenzyl)-2-methyl-N-(5-methyl-1H-pyrazol-3-yl)-8-(morpholinomethyl)imidazo[1,2-b]pyridazin-6-amine is a selective JAK2 inhibitor over JAK3.
• JAK2 target inhibition has been evaluated in Ba/F3 expressing JAK2 V617F by Western blot as reported in Wernig et al. (Wernig G, et al. Efficacy of TG 101348 , a selective JAK 2 inhibitor, in treatment of a murine model of JAK 2 V 617 F - induced polycythemia vera , Cancer Cell, April; 13(4):311-20).
• a medium throughput Cellomics assay was established to evaluate the JAK2 target inhibition in Ba/F3 cells expressing JAK2V617F. This assay enables the discovery of an effective therapeutic agent to treat disorders associated with JAK2V617F mutation.
• Ba/F3 (murine pro-B) cells expressing JAK2V617F maintained in RPMI 1640 with 10% FBS, 0.07% sodium bicarbonate, 1 mM sodium pyruvate, 1 ⁇ antibiotic/antimycotic (Invitrogen, Carlsbad, Calif.) and 0.45% glucose (Sigma, St Louis, Mo.). Cells are kept at 37° C. with 5% CO 2 .
• the test compound is prepared in 100% DMSO at 10 mM concentration.
• the compound is serially diluted 1:3 with 100% DMSO in a 10 point 200 ⁇ concentration-response range (4 mM-200 nM.).
• 2.5 ⁇ L of 200 ⁇ compound solution is added to 125 ⁇ L of complete RPMI 1640 media with 10% FBS for a 4 ⁇ concentration compound plate.
• cells are collected and washed twice with unsupplemented RPMI 1640. Cells are then suspended in 10% FBS completed RPMI medium for a final concentration of 4 ⁇ 10 5 /mL. Next, 500 mL of cells (2 ⁇ 10 5 cells) are transferred into 96 deep well plates. Finally, 2.5 ⁇ L (1:200 dilution) of compound stock solution are added to the cells and are incubated with cells in a 37° C. water bath for 60 min.
• a working solution of 2 mg/mL Hoechst (Acros Organics, Morris Plains, N.J.) is prepared with PBS. An aliquot of 200 ⁇ L is added to each well and cells are incubated at RT in the dark for 10 min. Cells are washed with PBS, and 50 ⁇ L of Cytofix® (BD Biosciences, San Jose, Calif.) is added to the cells. The cells are transferred to 96 well black tissue culture plates and sealed. The plates are spun down. Mean fluorescent intensity data are collected and analyzed using Cellomics Arrayscan® VTi. Compound treatment is compared to the vehicle to determine percent inhibition data. The relative IC 50 is calculated using a 4 parameter logistic curve fitting analysis with ActivityBase 4.0.
• the compounds of the present invention are preferably formulated as pharmaceutical compositions administered by a variety of routes. Most preferably, such compositions are for oral administration.
• Such pharmaceutical compositions and processes for preparing same are well known in the art. See, e.g., REMINGTON: THE SCIENCE AND PRACTICE OF PHARMACY (A. Gennaro, et al., eds., 19 th ed., Mack Publishing Co., 1995).
• the compounds of the present invention are generally effective over a wide dosage range.
• dosages per day normally fall within the range of about 1 mg to about 1000 mg total daily dose, preferably 500 mg to 1000 mg total daily dose, more preferably 600 mg to 1000 mg total daily dose.
• dosage levels below the lower limit of the aforesaid range may be more than adequate, while in other cases still larger doses may be employed.
• the above dosage range is not intended to limit the scope of the invention in any way. It will be understood that the amount of the compound actually administered will be determined by a physician, in the light of the relevant circumstances, including the condition to be treated, the chosen route of administration, the actual compound or compounds administered, the age, weight, and response of the individual patient, and the severity of the patient's symptoms.

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