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  • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
  • C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
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  • C07D401/14—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing three or more hetero rings
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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  • 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
  • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
  • A61K31/44—Non condensed pyridines; Hydrogenated derivatives thereof
  • A61K31/445—Non condensed piperidines, e.g. piperocaine
  • A61K31/45—Non condensed piperidines, e.g. piperocaine having oxo groups directly attached to the heterocyclic ring, e.g. cycloheximide
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  • 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
  • A61K31/496—Non-condensed piperazines containing further heterocyclic rings, e.g. rifampin, thiothixene or sparfloxacin
• • 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
  • A61K31/501—Pyridazines; Hydrogenated pyridazines not condensed and containing further heterocyclic rings
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  • A61P13/12—Drugs for disorders of the urinary system of the kidneys
• • A—HUMAN NECESSITIES
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  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/28—Drugs for disorders of the nervous system for treating neurodegenerative disorders of the central nervous system, e.g. nootropic agents, cognition enhancers, drugs for treating Alzheimer's disease or other forms of dementia
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P3/00—Drugs for disorders of the metabolism
  • A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
  • A61P3/10—Drugs for disorders of the metabolism for glucose homeostasis for hyperglycaemia, e.g. antidiabetics
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P9/00—Drugs for disorders of the cardiovascular system
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
  • C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
  • C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D451/00—Heterocyclic compounds containing 8-azabicyclo [3.2.1] octane, 9-azabicyclo [3.3.1] nonane, or 3-oxa-9-azatricyclo [3.3.1.0<2,4>] nonane ring systems, e.g. tropane or granatane alkaloids, scopolamine; Cyclic acetals thereof
  • C07D451/02—Heterocyclic compounds containing 8-azabicyclo [3.2.1] octane, 9-azabicyclo [3.3.1] nonane, or 3-oxa-9-azatricyclo [3.3.1.0<2,4>] nonane ring systems, e.g. tropane or granatane alkaloids, scopolamine; Cyclic acetals thereof containing not further condensed 8-azabicyclo [3.2.1] octane or 3-oxa-9-azatricyclo [3.3.1.0<2,4>] nonane ring systems, e.g. tropane; Cyclic acetals thereof
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  • 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
  • C07D487/08—Bridged systems
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  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D498/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms
  • C07D498/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
  • C07D498/08—Bridged systems

Definitions

• the present invention relates to pharmaceutical compounds, compositions, and methods for the treatment of cardiac and respiratory conditions, renal disease, liver disease, muscular dystrophy, fibrotic disorders, pain, ischemia or ischemic reperfusion injury, and cancer, as well as inhibiting the Transient Receptor Potential C6 ion channel (TRPC6).
• TRPC6 Transient Receptor Potential C6 ion channel
• ion channel proteins exist to mediate ion flux across cellular membranes.
• the proper expression and function of ion channel proteins is essential for the maintenance of cellular function, intracellular communication, and the like.
• An important aspect of achieving cellular homeostasis is the maintenance of appropriate ion concentrations in various cell types during development and in response to numerous stimuli.
• Large numbers of diverse types of ion channels act to maintain cellular homeostasis by moving ions into and out of cells across the plasma membrane, and within cells by moving ions across membranes of intracellular organelles including, for example, the endoplasmic reticulum, sarcoplasmic reticulum, mitochondria and endocytic organelles including endosomes and lysosomes.
• TRPC6 Transient Receptor Potential C6
• TRPC6 belongs to the larger family of TRP ion channels (see, Desai et al., 2005 Eur J Physiol 451 :1 1-18; Clapham et al., 2001 Nat Neurosci 2:387-396; Clapham, 2003 Nature 426: 517-524;
• TRPC6 is a calcium permeable channel, specifically a non-selective calcium permeable cation channel.
• TRPC6 channels are permeable to other cations, for example sodium.
• TRPC6 channels modulate not only intracellular calcium concentration, but also membrane potential by modulating the flux of cations including calcium and sodium ions.
• non-selective cation channels such as TRPC6 modulate, among other things, calcium ion flux, they are mechanistically distinct from voltage-gated calcium channels.
• TRPC6 voltage-gated calcium channels respond to depolarization of the potential difference across the membrane and can open to permit an influx of calcium from the extracellular medium and a rapid increase in intracellular calcium levels or concentrations.
• non-selective cation channels such as TRPC6 are generally signal transduction gated, long-lasting, and produce less rapid changes in ion concentration. They show increased activity in response to the production of the second messenger, diacylglycerol (Hofmann et al., 1999).
• TRPC6 can respond to changes in pressure.
• TRPC6 function has been implicated in, among other things, the modulation of myogenic tone. TRPC6 is highly expressed in smooth muscle cells, vascular smooth muscle cells, cardiomyocytes, pulmonary arteries, the aorta, heart, liver, brain, and kidney. The expression of TRPC6, along with experiments conducted in knock-out mice and cells in culture, suggest that TRPC6 may provide a useful target for the treatment of hypertension and other cardiac and vascular conditions, preeclampsia.
• TRPC6 focal segmental glomerulsclerosis
• FGS focal segmental glomerulsclerosis
• These mutations that are reported to be gain-of- function are sufficient to induce disease.
• elevated TRPC6 expression has been associated with nephrotic syndrome, minimal change disease, and diabetic nephropathy (Moller et al., 2006, llatovskaya et al., 2013, Thilo et al., 201 1 )., or other kidney conditions.
• TRPC6 is also thought to be important in respiratory conditions, restenosis, liver disease, muscular dystrophy, fibrotic disorders, pain, ischemia and ischemic reperfusion injury, and certain forms of cancer.
• Pulmonary vascular medial hypertrophy caused by excessive pulmonary artery smooth muscle cell (PASMC) proliferation is a major cause for the elevated pulmonary vascular resistance in patients with IPAH.
• PASMC pulmonary artery smooth muscle cell
• TRPC3 was minimally expressed in PASMC from healthy lung tissue. However, in lung tissue from IPAH patients, mRNA and protein expression of TRPC3 and TRPC6 were significantly elevated in comparison to that in normotensive patients. Furthermore, proliferation of PASMC cells derived from IPAH patients was markedly reduced following incubation with TRPC6 siRNA. Based on these results, the authors concluded that TRPC6 may be important in mediating proper PASMC proliferation, and that dysregulation of TRPC6 may lead to increased PASMC proliferation and pulmonary vascular medial hypertrophy observed in IPAH patients (Yu et al., 2004 Proc Natl Acad Sci 101 (38):13861-6).
• TRPC6 dysregulation in IPAH comes from studies of bosentan, a dual endothelin receptor blocker, that has been used clinically to treat IPAH. This inhibitor decreases proliferation of PASMCs, but the mechanism by which this occurs is unclear. Interestingly, bosentan both decreases proliferation of PASMC and also decreases expression of TRPC6 in lung tissue of IPAH patients (Kunichika et al., 2004 Am J Respir Crit Care Med 170(10):1 101 -7).
• TRPC6 in alveolar macrophages from patients with chronic obstructive pulmonary disease (COPD), TRPC6 expression was found to be elevated when compared with controls (Finney-Hayward et al., 2010 Am J Respir Cell Mol Biol 43:296-304). In human cystic fibrosis epithelial cells, the TRPC6-mediated calcium influx is abnormally increased and may contribute to the hypersecretion of mucus. siRNA-TRPC6 was able to reduce this abnormal calcium influx (Antigny et al. 201 1 Am J Resp Cell Mol Biol, 44:83 - 90).
• TRPC6 in other cardiac conditions, including cardiac hypertrophy.
• the hearts of patients with dilated cardiomyopathy have elevated TRPC6 mRNA expression when compared with normal hearts (Kuwahara et al., 2006 J Clin Invest).
• TRPC6 cardiac mRNA levels are elevated by pressure overload (Kuwahara et al., 2006 J Clin Invest 1 16:31 14-26), chronic isoproterenol treatment (Xie et al., 2012 Nat Commun 3:1238), and uremic cardiomyopathy induced by partial nephrectomy (Xie et al., 2015 J Am Soc Nephrol 26:1 150-60).
• GSK833503A exhibited dose-dependent inhibition of cell hypertrophy signaling in neonatal and adult cardiac myocytes (Seo et al., 2014 Proc Natl Acad Sci 1 1 1 :1551 -1556). Similarly, mice deficient for TRPC6 were protected from isoproterenol-induced cardiac hypertrophy (Xie et al., 2012 Nat Commun 3:1238).
• TRPC6 activity may be beneficial for the treatment of cardiovascular disease.
• atheroprone shear stress-induces increased TRPC6 mRNA levels in human vascular endothelial cells (EC) when compared to atheroprotective flow conditions (Thilo, et al., 2012 Hypertension 59:1232-40).
• EC migration is important for healing after arterial injury, and lysophosphatidylcholine-mediated inhibition of EC migration was prevented in vitro in cells from TRPC6 deficient mice.
• TRPC6 oxidized low- density lipoprotein-induced apoptosis of human aortic ECs was demonstrated to be dependent on TRPC6 (Zhang et al., 2015 Sci Rep 5:9401-10).
• TRPC6 mRNA levels were increased in vascular SMCs and correlated with reduced cerebral blood flow (Johannson et al., 2015 Acta Physiol 214:376-89).
• TRPC6 is important in normal podocyte function by controlling calcium influx and nuclear factor of activated T cell activation in which elevated current through the channel is associated with renal injury and the induction of proteinuria (Moller et al., 2007 J Am Soc Nephrol 18:29-36 and Schlondorff et al., 2009 Am J Physiol Cell Physiol 296:C558-69).
• TRPC6 is elevated in human chronic kidney diseases including FSGS, minimal change disease, membraneous glomerulonephritis, and diabetic nephropathy (Moller et al., 2007 J Am Soc Nephrol 18:29-36 and Thilo et al., 201 1 Nephrol. Dial. Transplant 27:921 -9) as well as in mouse models of podocyte injury (Moller et al., 2007 J Am Soc Nephrol 18:29-36).
• TRPC6 deficient mice have been demonstrated to have reduced angiotensin II (Ang II)- induced albuminuria (Eckel et al., 201 1 J Am Soc Nephrol 22:526-35) whereas transgenic podocyte-specific expression of human GoF mutations in mice induces albuminuria and glomerular lesions (Krall et al., 2010 PLoS ONE e12859 and Canales et al., 2015 Brit J Medicine Med Res 5:1 198-1212). Consequently, inhibition of TRPC6 may be useful in the treatment of chronic kidney diseases.
• TRPC6 inhibitor compounds can be used in treating or ameliorating chronic kidney diseases or conditions caused (in whole or in part) by TRPC6 dysfunction. Additionally, TRPC6 inhibitor compounds can be used in treating or ameliorating symptoms of kidney diseases (e.g., hypertension, proteinuria, etc.), regardless of the cause of the disease.
• kidney diseases e.g., hypertension, proteinuria, etc.
• TRPC6 is expressed in the myometrium and placenta during pregnancy (Ku et al., 2006 J Soc Gynecol Investig 13:217-225; Clarson et al., 2003 J Physiol 550:515-528). As such TRPC6 may contribute to maintaining proper myogenic tone in the placenta and/or in maintaining proper fetal and maternal blood pressure during pregnancy.
• TRPC6 in certain forms of cancer.
• TRPC6 expression is elevated in cells taken from patients with gliobastoma multiforme, the most frequent and incurable type of brain cancer (Chigurupati, et al., 2010 Cancer Res, 70:418-427; Ding et al., 2010 J Natl Cancer Inst. 102:1052-1068).
• Ding et al. found elevated levels of TRPC6 in human glioma cells, and inhibition of TRPC6 pharmacologically or with a dominant-negative mutant suppressed cell growth in vitro.
• lentiviral-mediated expression of dominant- negative TRPC6 in the tumor cells prior subcutaneous or intracranial implantation reduced tumor volume when compared to controls (Ding et al., J. Natl. Cancer Inst. 2010, 102, 1052- 1068).
• TRPC6 Increased levels of TRPC6 was also found to be associated with cervical cancer (Wan et al, 2012 Onco Targets Ther 5:171 -176), breast cancer (Dhennin-Duthille et al., 201 1 Cell Physiol Biochem 28:813-822), renal cell carcinoma (Song et al, 2013 Mol Biol Rep 40:51 15-5122), head and neck squamous cell carcinoma (de Quiros, et al. 2013 BMC Cancer 13:1 16-127), and esophageal squamous cell carcinoma (Zhang et al., 2013 Med Oncol 30:607), among others.
• TRPC6 may be a promising therapeutic target for cancer treatment.
• Liver diseases including non-alcoholic steatohepatitis may be treated by reducing TRPC6 activity.
• Hypoxia increased TRPC6 expression in a human hepatic stellate cell line when compared to normoxic conditions.
• TRPC6 RNA silencing down-regulated transcripts for alpha smooth muscle actin and collagen 1 A1 both of which are associated with fibrosis, in response to hypoxia (Iyer et al., 2015 Exp Cell Res 336:66-75).
• TRPC6 may provide benefit to patients with Duchenne muscular dystrophy (DMD).
• DMD Duchenne muscular dystrophy
• TRPC6 deficiency restored the stress-stimulated contractility force and calcium transient response to normal when compared with mice possessing the wild-type TRPC6 gene, suggesting that TRPC6 inhibition will preserve cardiac function in DMD patients (Seo et al., 2014 Circ Res 1 14:823- 32).
• Fibrotic disorders may be treated with TRPC6 inhibitors.
• TRPC6 deficient mice demonstrated reduced dermal and cardiac wound healing (Davis et al., 2012 Dev Cell 23:705-15).
• TRPC6 inhibitors may be useful for the treatment of pain.
• Spinal delivery of TRPC6 antisense oligonucleotides reduced hyperalgesia induced by mechanical, hypotonic, and thermal stimuli in preclinical pain models (Alessandri-Haber et al., 2009 J Neurosci 29:6217- 28).
• Modulating a function of TRPC6 provides a means for modulating calcium homeostasis, sodium homeostasis, intracellular calcium levels, membrane polarization (resting membrane potential), and/or cation levels in a cell.
• Compounds that can modulate one or more TRPC6 functions are useful in many aspects including, but not limited to, maintaining calcium homeostasis; maintaining sodium homeostasis; modulating intracellular calcium levels;
• membrane polarization membrane potential
• modulating cation levels and/or treating or preventing diseases, disorders, or conditions associated with calcium
• the present invention provides novel compounds that modulate TRPC6 and thus are useful for treating a variety of diseases and disorders that can be alleviated by modulating TRPC6 including hypertension, preeclampsia, restenosis, a cardiac or respiratory condition, renal disease, liver disease, muscular dystrophy, fibrotic disorders, pain, ischemia or ischemic reperfusion injury, and cancer.
• This invention also relates to pharmaceutical compositions comprising these compounds, methods of using these compounds in the treatment of various diseases and disorders, processes for preparing these compounds and intermediates useful in these processes.
• the invention relates to a compound of formula (I),
• L is absent or is methylene or ethylene
• Y is CH or N; A is CH or N;
• R 1 is selected from the group consisting of:
• Ci -6 alkyl optionally substituted with 1 to 3 groups independently selected from the group consisting of halo, C 3-6 cycloalkyl and OC 3-6 cycloalkyl; phenyl optionally substituted with 1 to 3 groups independently selected from the group consisting of CF 3 , halo, C 3-6 cycloalkyl, OC 3-6 cycloalkyl, OCi -6 alkyl optionally substituted with one to three halo; and
• C 3-6 cycloalkyl optionally substituted with 1 to 3 groups independently selected from the group consisting of halo and Ci -6 alkyl optionally substituted with 1 to 3 halo;
• R 2 is selected from the group consisting of H, Ci -6 alkyl, OCF 3 , C 3-6 cycloalkyl, OCi -6 alkyl, OC 3- 6 cycloalkyl;
• R 3 is selected from the group consisting of H, Ci -6 alkyl, C 3-6 cycloalkyl, OC 3-6 cycloalkyl;
• each of the Ci -6 alkyl, C 3-6 cycloalkyl, OC 3-6 cycloalkyl of the R 3 group may be optionally substituted with one to three groups each independently selected from the group consisting of halo, OH, OCi -6 alkyl , SCi -6 alkyl, N(Ci -6 alky) 2 ; and wherein one to three carbon atoms of the Ci -6 alkyl of the R 3 group may optionally be replaced one or two moieties selected from the group consisting of NH, N(Ci -6 alkyl), O, and S;
• R 4 and R 5 are each independently selected from the group consisting of H or Ci -6 alkyl
• R 3 and R 4 can together with the atom to which they are attached join to form a 3 to 9- membered carbocyclyl ring which optionally may contain one to three heteroatoms selected from the group consisting of N, O, and S; or
• R 3 and R 5 can together form a 3 to 9-membered bicyclic ring which optionally may contain one to three heteroatoms selected from the group consisting of N, O, and S;
• R 6 is selected from the group consisting of H, Ci -6 alkyl, CN, CF 3 , OCF 3 , C 3-6 cycloalkyl, OCi_ 6 alkyl, and OC 3-6 cycloalkyl;
• R 7 is selected from the group consisting of H and OCi -6 alkyl; or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to the first embodiment above, wherein R 1 is selected from the group consisting of:
• Ci -6 alkyl optionally substituted with 1 to 3 groups independently selected from the group consisting of halo, C 3-6 cycloalkyl; phenyl optionally substituted with 1 to 3 groups independently selected from the group consisting of CF 3 , halo, OC 3-6 cycloalkyl, and OCi -6 alkyl optionally substituted with one to three halo; and
• R 2 is OCi -6 alkyl
• R 3 is selected from the group consisting of H, Ci -6 alkyl optionally substituted with OH or OCi_ 6 alkyl,
• R 4 is H
• R 5 is H
• R 3 and R 4 can together with the atom to which they are attached join to form a 3 to 9- membered carbocyclyl ring which optionally may contain one to three heteroatoms selected from the group consisting of N and O; or
• R 3 and R 5 can together form a 3 to 9-membered bicyclic which optionally may contain one to three heteroatoms selected from the group consisting of N and O;
• R 6 is selected from the group consisting of H, Ci -6 alkyl, OCi -6 alkyl, and OC 3-6 cycloalkyl,
• R 7 is selected from the group consisting of H and OCi -6 alkyl; or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to embodiment one or two above, wherein
• A is CH and Y is N;
• A is CH and Y is CH;
• A is N and Y is CH; or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to any one of embodiments one to three above, wherein
• R 1 is selected from the group consisting phenyl optionally substituted with a group selected from the group consisting of CF 3 , OCF 3 , halo, OC 3-6 cycloalkyl, and OCi -6 alkyl optionally substituted with one to three halo; and,
• R 2 is OCi -6 alkyl
• R 3 is selected from the group consisting of H, Ci -6 alkyl optionally substituted with OH or OC-i. 6 alkyl;
• R 4 is H
• R 5 is H
• R 3 and R 4 can together with the atom to which they are attached join to form a 3 to 9- membered carbocyclyl ring which optionally may contain one to three heteroatoms selected from the group consisting of N, O; or
• R 3 and R 5 can together form a 3 to 9-membered bicyclic which optionally may contain one to three heteroatoms selected from the group consisting of N and O;
• R 6 is selected from the group consisting of H, Ci -6 alkyl, OCi -6 alkyl, and OC 3-6 cycloalkyl;
• R 7 is selected from the group consisting of H and OCi -6 alkyl; or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to any one of embodiments one to four above, wherein
• R 1 is selected from the group consisting phenyl optionally substituted with a group selected from the group consisting of CF 3 , OCF 3 , F, and methoxy;
• R 2 is selected from the group consisting of methoxy or ethoxy
• R 3 is selected from the group consisting of H, 2-hydroxymethyl, methoxymethyl, 1 - hydroxyethyl;
• R 4 is H
• R 5 is H
• R 3 is ethyl, and R 3 and R 4 join to form a spirocyclic ring; or
• R 3 is ethyl or methoxymethyl, and R 3 and R 5 join to form a bicyclic ring;
• R 6 is selected from the group consisting of H, methyl, methoxy, ethoxy, propoxy, and cyclylpropyloxy;
• R 7 is selected from the group consisting of H and methoxy; or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to any one of embodiments one to five above, wherein
• R 1 together with L represent a group selected from the group consisting of phenyl, 4- chlorophenyl, 4-fluorophenyl, 4-methoxyphenyl, 4-isopropoxyphenyl, 4-trifluoromethylphenyl, 4-difluoromethoxyphenyl 4-cyclopropyloxyphenyl, cyclopropyl, cyclopentyl, cyclohexyl, benzyl, 2-fluorobenzyl, and phenylethyl;
• R 2 is methoxy or ethoxy; or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to any one of embodiments one to six above, wherein
• Y is CH and A is N;
• R 1 together with L represent a group selected from the group consisting of phenyl, 4- chlorophenyl, 4-fluorophenyl, 4-methoxyphenyl, 4-isopropoxyphenyl, 4-trifluoromethylphenyl, 4-difluoromethoxyphenyl 4-cyclopropyloxyphenyl, benzyl, 2-fluorobenzyl, and phenylethyl;
• R 2 is methoxy or ethoxy
• R 3 , R 4 and R 5 are each H;
• R 6 is H, methyl, methoxy or ethoxy
• R 7 is H; or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to any one of embodiments one to six above, wherein
• Y is CH and A is CH;
• R 1 together with L represent a group selected from the group consisting of phenyl, 4- chlorophenyl, 4-fluorophenyl, 4-methoxyphenyl, 4-trifluoromethylphenyl, cyclopentyl, cyclohexyl, benzyl, 2-fluorobenzyl, phenylethyl;
• R 2 is methoxy or ethoxy
• R 3 , R 4 and R 5 are each H;
• R 6 is H, methyl, methoxy, or ethoxy
• R 7 is H; or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to any one of embodiments one to five above, wherein
• Y is N and A is CH;
• R 1 together with L represent a group selected from the group consisting of phenyl, and 4- fluorophenyl;
• R 2 is methoxy
• R 3 is selected from the group consisting of H, 2-hydroxymethyl, and hydroxyethyl, R 4 is H; R 5 is H;
• R 3 and R 4 may join to form a spirocyclic ring
• R 3 and R 5 may join to form a bicyclic ring
• R 6 is selected from the group consisting of H and methoxy; R 7 is H; or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to any one of embodiments one to four above, wherein
• R 1 is Ci -6 alkyl optionally substituted with 1 to 3 groups independently selected from the group consisting of halo and C 3-6 cycloalkyl;
• R 2 is OCi -6 alkyl
• R 3 , R 4 and R 5 are each H;
• R 6 is selected from the group consisting of H, Ci -6 alkyl, and OCi -6 alkyl; R 7 is H; or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to any one of embodiments one to four and ten above, wherein
• R 1 together with L represent a group selected from the group consisting ethyl, propyl, isopropyl, isobutyl, cyclopropylmethyl, cyclobutylmethyl, 2,2-dimethylpropyl, 1 - methylcyclopropylmethyl, 1 -fluoromethylcyclopropylmethyl, 1-cyclopropylethyl, 2- cyclopropylethyl, cyclopentyl, cyclohexyl, 2,2-difluorocyclobutylmethyl, 3,3- difluorocyclobutylmethyl, 3-(trifluoromethyl)cyclobutylmethyl, and 3,3,3-trifluoro-2-methyl- propyl;
• R 2 is methoxy
• R 3 , R 4 and R 5 are each H;
• R 6 is selected from the group consisting of H, methyl, and methoxy;
• R 7 is H; or a pharmaceutically acceptable salt thereof.
• the invention in another embodiment (embodiment twelve), relates to a compound according to any one of embodiments one to four, ten and eleven above, wherein Y is CH and A is N;
• R 1 together with L represent a group selected from the group consisting propyl, isopropyl, isobutyl, cyclopropylmethyl, cyclobutylmethyl, 2,2-dimethylpropyl, 1 -cyclopropylethyl, 2- cyclopropylethyl, and cyclohexyl;
• R 2 is methoxy
• R 3 , R 4 and R 5 are each H;
• R 6 is selected from the group consisting of H, methyl, and methoxy;
• R 7 is H; or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to any one of embodiments one to four, ten and eleven above, wherein
• Y is CH and A is CH;
• R 1 together with L represent a group selected from the group consisting ethyl, propyl, isopropyl, isobutyl, cyclopropylmethyl, cyclobutylmethyl, 2,2-dimethylpropyl, 1 - methylcyclopropylmethyl, 1 -fluoromethylcyclopropylmethyl, 1-cyclopropylethyl, 2- cyclopropylethyl, cyclopentyl, cyclohexyl, 2,2-difluorocyclobutylmethyl, 3,3- difluorocyclobutylmethyl, 3-(trifluoromethyl)cyclobutylmethyl, and 3,3,3-trifluoro-2-methyl- propyl;
• R 2 is methoxy
• R 3 , R 4 and R 5 are each H;
• R 6 is selected from the group consisting of H, methyl, and methoxy;
• R 7 is H; or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to embodiment one above, wherein
• R 3 and R 4 together with the atom to which they are attached join to form a 3-membered carbocyclyl ring; or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to embodiment one above, wherein
• R 3 and R 5 together form a 3 to 9-membered bicyclic ring which optionally may contain one to two heteroatoms independently selected from the group consisting of N and O, and or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to embodiment one above, wherein
• Y is C
• A is N;
• R 2 is OCH 3 ;
• R 3 , R 4 , R 5 and R 7 are each H; or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to embodiment one or sixteen above, wherein
• R 1 is phenyl optionally substituted with 1 to 3 groups independently selected from the group consisting of CF 3 , halo, C 3-6 cycloalkyl, OC 3 - 6 cycloalkyl, OCi -6 alkyl optionally substituted with one to three halo; and
• R 6 is H; or OCH 3 ; or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to any one of embodiments one or sixteen above, wherein
• R 1 is selected from the group consisting of phenyl optionally substituted with 1 to 3 groups independently selected from the group consisting of CF 3 , halo, OC 3-6 cycloalkyl, and OCi_ 6 alkyl optionally substituted with one to three halo;
• R 2 is OCH 3 or OCH 2 CH 3 ;
• R 3 , R 4 , R 5, R 6 , and R 7 are each H; and or a pharmaceutically acceptable salt thereof.
• the invention relates to a compound according to any one of embodiments one or sixteen above, wherein
• R 1 is selected from the group consisting of phenyl optionally substituted with 1 to 3 groups independently selected from the group consisting of CF 3 , halo, OC 3-6 cycloalkyl, and OCi_ 6 alkyl optionally substituted with one to three halo;
• R 2 is OCH 3 of OCH 2 CH 3 ;
• R 3 , R 4 , R 5 and R 7 are each H;
• R 6 is CH 3 or OCH 3 ;
• Y is CH
• A is N; or a pharmaceutically acceptable salt thereof.
• the invention in another embodiment (embodiment twenty), relates to any one of embodiments one or sixteen to nineteen, wherein L is absent; or a pharmaceutically acceptable salt thereof.
• the invention in another embodiment (embodiment twentyone), relates to a compound according to embodiment one above, wherein the compound is selected from the group consisting of any one of compounds 1-95 in Table 1 , or a pharmaceutically acceptable salt thereof.
• the invention in another embodiment (embodiment twentytwo), relates to a pharmaceutical composition
• a pharmaceutical composition comprising any one of the compounds according to embodiments one to twentyone above, or a pharmaceutically acceptable salt thereof, and optionally a pharmaceutically acceptable excipient.
• the invention in another embodiment (embodiment twentythree), relates to a method of treating a disease or disorder that can be alleviated TRPC6 inhibition comprising administering a therapeutically effective amount of any one of the compounds according to any one of embodiments one to twentyone above, or a pharmaceutically acceptable salt thereof, to a patient in need thereof.
• the invention relates to a method according to embodiment twentythree, wherein the disease or disorder is selected from the group consisting of cardiac hypertrophy, ischemia, ischemic reperfusion injury, hypertension, pulmonary arterial hypertension, idiopathic pulmonary arterial hypertension , restenosis, chronic obstructive pulmonary disease, cystic fibrosis, Alzheimer's disease, Parkinson's disease, Huntington's disease, amyotrophic lateral sclerosis (ALS), trauma induced brain disorders, asthma, chronic obstructive pulmonary disease, rheumatoid arthritis, osteoarthritis, inflammatory bowel disease, multiple sclerosis, muscular dystrophy, Duchenne muscular dystrophy, preeclampsia and pregnancy-induced hypertension, non-alcoholic steatohepatitis, minimal change disease, focal segmental glomerulosclerosis (FSGS), nephrotic syndrome, diabetic nephropathy or diabetic kidney disease (DKD), renal ins
• FSGS focal segmental glomerul
• Table 1 shows the compounds of the invention which can be made by the synthetic schemes and the examples shown in the Synthetic Examples section below, and known methods in the art.
• the invention relates to any of the compounds 1 to 95 depicted in Table 1 above, and the pharmaceutically acceptable salts thereof.
• the invention relates to any one of compounds 6, 16, 17, 33, 34, 40, 41 , 44, 54, 57, 80, 83 and 88 depicted in Table 1 ; and the pharmaceutically acceptable salts thereof.
• the invention relates to any one of compounds 29, 31 , 49, 56, 66, 85, 87, and 90 depicted in Table 1 ; and the pharmaceutically acceptable salts thereof.
• Ci -6 -alkyl means an alkyl group or radical having 1 to 6 carbon atoms.
• groups like HO, H 2 N, (O)S, (0) 2 S, NC (cyano), HOOC, F 3 C or the like the skilled artisan can see the radical attachment point(s) to the molecule from the free valences of the group itself.
• aryl-Ci -3 -alkyl means an aryl group which is bound to a Ci -3 -alkyl-group, the latter of which is bound to the core or to the group to which the substituent is attached.
• substituted means that any one or more hydrogens on the designated atom is replaced with a selection from the indicated group, provided that the designated atom's normal valence is not exceeded, and that the substitution results in a stable compound.
• a given chemical formula or name shall encompass tautomers and all stereo, optical and geometrical isomers (e.g. enantiomers, diastereomers, E/Z isomers etc.) and racemates thereof as well as mixtures in different proportions of the separate enantiomers, mixtures of diastereomers, or mixtures of any of the foregoing forms where such isomers and enantiomers exist, as well as salts, including pharmaceutically acceptable salts thereof and solvates thereof such as for instance hydrates including solvates of the free compounds or solvates of a salt of the compound.
• Enantiomerically pure compounds of this invention or intermediates may be prepared via asymmetric synthesis, for example by preparation and subsequent separation of appropriate diastereomeric compounds or intermediates which can be separated by known methods (e.g. by chromatographic separation or crystallization) and/or by using chiral reagents, such as chiral starting materials, chiral catalysts or chiral auxiliaries.
• pharmaceutically acceptable refers to those compounds, materials, compositions, and/or dosage forms which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of human beings and animals without excessive toxicity, irritation, allergic response, or other problem or complication, and commensurate with a reasonable benefit/risk ratio.
• pharmaceutically acceptable salt refers to derivatives of the disclosed compounds wherein the parent compound is modified by making acid or base salts thereof. Examples of pharmaceutically acceptable salts include, but are not limited to, mineral or organic acid salts of basic residues such as amines; alkali or organic salts of acidic residues such as carboxylic acids; and the like.
• such salts include salts from benzenesulfonic acid, benzoic acid, citric acid, ethanesulfonic acid, formic acid, fumaric acid, gentisic acid, hydrobromic acid, hydrochloric acid, maleic acid, malic acid, malonic acid, mandelic acid, methanesulfonic acid, 4-methyl- benzenesulfonic acid, phosphoric acid, salicylic acid, succinic acid, sulfuric acid tartaric acid, and trifluoroacetic acid.
• Further pharmaceutically acceptable salts can be formed with cations from ammonia, L- arginine, calcium, 2,2'-iminobisethanol, L-lysine, magnesium, /V-methyl-D-glucamine , potassium, sodium and tris(hydroxymethyl)-aminomethane.
• the pharmaceutically acceptable salts of the present invention can be synthesized from the parent compound which contains a basic or acidic moiety by conventional chemical methods. Generally, such salts can be prepared by reacting the free acid or base forms of these compounds with a sufficient amount of the appropriate base or acid in water or in an organic diluent like ether, ethyl acetate, ethanol, isopropanol, or acetonitrile, or a mixture thereof.
• Salts of other acids than those mentioned above which for example are useful for purifying or isolating the compounds of the present invention e.g. trifluoro acetate salts, formates
• Salts of other acids than those mentioned above which for example are useful for purifying or isolating the compounds of the present invention also comprise a part of the invention.
• halogen generally denotes fluorine, chlorine, bromine and iodine
• n is an integer selected from the group consisting of 2, 3, 4, 5 or 6, preferably 4 or 6, either alone or in combination with another radical denotes an acyclic, saturated, branched or linear hydrocarbon radical with 1 to n C atoms.
• d-s-alkyl embraces the radicals H 3 C-, H 3 C-CH 2 -, H3C-CH2-CH2-, H 3 C-CH(CH 3 )-,
• C 3 - n -cycloalkyl wherein n is an integer from 4 to n, either alone or in combination with another radical denotes a cyclic, saturated, unbranched hydrocarbon radical with 3 to n C atoms.
• C 3- 7-cycloalkyl includes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and cycloheptyl.
• halo added to an "alkyl”, “alkylene” or “cycloalkyl” group (saturated or unsaturated) is such an alkyl or cycloalkyl group wherein one or more hydrogen atoms are replaced by a halogen atom selected from among fluorine, chlorine or bromine, preferably fluorine and chlorine, particularly preferred is fluorine.
• a halogen atom selected from among fluorine, chlorine or bromine, preferably fluorine and chlorine, particularly preferred is fluorine.
• aryl group e.g., phenyl
• Carbocyclyl as used either alone or in combination with another radical, means a mono- bi- or tricyclic ring structure consisting of 3 to 9 carbon atoms and optionally a heteroatom selected from the group consisting of N, O, and S.
• the term “carbocyclyl” refers to fully saturated ring systems and encompasses fused, bridged and spirocyclic systems.
• the present application provides compounds that can modulate TRPC6 function. Methods employing these compounds are also provided. Certain embodiments provide a method of modulating a TRPC6 function in a cell or animal comprising administering an effective amount of a compound that inhibits a TRPC6 function, wherein the compound inhibits a TRPC6-mediated ion flux. Certain embodiments provide a method of modulating a TRPC6 function in a cell or animal comprising administering an effective amount of a compound that inhibits a TRPC6 function, wherein the compound inhibits a TRPC6-mediated calcium influx.
• Certain embodiments provide a method of modulating a TRPC6 function in a cell or animal comprising administering an effective amount of a compound that inhibits a TRPC6 function, wherein the compound inhibits a TRPC6-mediated cytoskeletal reorganization or alteration in cell morphology. Certain embodiments provide a method of modulating a TRPC6 function in a cell comprising administering to the cell an effective amount of a compound that inhibits TRPC6 function, wherein the compound inhibits outward current mediated by TRPC6.
• Certain embodiments provide a method of modulating a TRPC6 function in a cell comprising administering to the cell an effective amount of a compound that inhibits TRPC6 function, wherein the compound inhibits inward current mediated by TRPC6. Certain embodiments provide a method of modulating a TRPC6 function in a cell comprising administering to the cell an effective amount of a compound that inhibits TRPC6 function, wherein the compound inhibits both the inward and outward currents mediated by TRPC6. Certain embodiments provide a method of modulating a TRPC6 function in a cell comprising administering to the cell an effective amount of a compound that inhibits TRPC6 function, wherein the compound inhibits TRPC6 mediated increases in intracellular calcium concentration.
• Certain embodiments provide a method of modulating a TRPC6 function in a cell comprising administering to the cell an effective amount of a compound that inhibits TRPC6 function, wherein the compound inhibits alterations in cell morphology. Certain embodiments also provide a method of preventing or treating a disease or condition related to TRPC6 function in a subject comprising administering to the subject a therapeutically effective amount of a compound that inhibits TRPC6 function, wherein the compound inhibits the inward current mediated by TRPC6.
• Certain embodiments provide a method of preventing or treating a disease or condition related to TRPC6 function in a subject comprising administering to the subject a therapeutically effective amount of a compound that inhibits TRPC6 function, wherein the compound inhibits the outward current mediated by TRPC6.
• embodiments also provide a method of preventing or treating a disease or condition related to TRPC6 function in a subject comprising administering to the subject a therapeutically effective amount of a compound that inhibits TRPC6 function, wherein the compound inhibits both the inward and outward current mediated by TRPC6.
• Certain embodiments provide a method of preventing or treating a disease or condition related to TRPC6 function in a subject comprising administering to the subject a therapeutically effective amount of a compound that inhibits TRPC6 function, wherein the compound inhibits the ion flux mediated by TRPC6.
• inhibition of a particular current refers to the ability of a compound to inhibit that current (e.g., inward and/or outward) in either an in vitro or an in vivo assay. Inhibition of a particular current in either an in vivo or an in vitro assay serves as a proxy for the particular functional activity of the particular compound.
• the present invention provides methods of treating a TRPC6 mediated disorder in a subject, the method comprising administering an effective amount of a compound of the invention wherein each of the variables above are described herein, for example, in the detailed description below.
• the present invention further provides a method for treating a TRPC6 mediated disorder in a subject, wherein the method comprises administering a composition comprising a compound of the invention and a pharmaceutically acceptable excipient, diluent or carrier.
• the present invention further provides a method for treating a TRPC6 mediated disorder in a subject, wherein the method comprises administering a composition comprising a compound of the invention and a pharmaceutically acceptable excipient, diluent or carrier, and the TRPC6 mediated disorder is selected from the group consisting of cardiac hypertrophy, ischemia, ischemic reperfusion injury, hypertension, pulmonary arterial hypertension, idiopathic pulmonary arterial hypertension , restenosis, chronic obstructive pulmonary disease, cystic fibrosis, Alzheimer's disease, Parkinson's disease, Huntington's disease, amyotrophic lateral sclerosis (ALS), trauma induced brain disorders, asthma, chronic obstructive pulmonary disease, rheumatoid arthritis, osteoarth
• a given chemical formula or name shall encompass tautomers and all stereo, optical and geometrical isomers (e.g. enantiomers, diastereomers, E/Z isomers ,etc.) and racemates thereof as well as mixtures in different proportions of the separate enantiomers, mixtures of diastereomers, or mixtures of any of the foregoing forms where such isomers and enantiomers exist, as well as salts, including pharmaceutically acceptable salts thereof and solvates thereof such as for instance hydrates including solvates of the free compounds or solvates of a salt of the compound.
• Some of the compounds in Table 1 can exist in more than one tautomeric form.
• the invention includes methods for using all such tautomers.
• the invention includes pharmaceutically acceptable derivatives of compounds of the invention.
• a "pharmaceutically acceptable derivative” refers to any pharmaceutically acceptable salt or ester, or any other compound which, upon administration to a patient, is capable of providing (directly or indirectly) a compound useful for the invention, or a pharmacologically active metabolite or pharmacologically active residue thereof.
• a pharmacologically active metabolite shall be understood to mean any compound of the invention capable of being metabolized enzymatically or chemically. This includes, for example, hydroxylated or oxidized derivative compounds of the invention.
• pharmaceutically acceptable salts refer to derivatives of the disclosed compounds wherein the parent compound is modified by making acid or base salts thereof.
• salts examples include, but are not limited to, mineral or organic acid salts of basic residues such as amines; alkali or organic salts of acidic residues such as carboxylic acids; and the like.
• such salts include acetates, ascorbates, benzenesulfonates, benzoates, besylates, bicarbonates, bitartrates,
• gluceptates gluconates, glutamates, glycolates, glycollylarsnilates, hexylresorcinates, hydrabamines, hydroxymaleates, hydroxynaphthoates, iodides, isothionates, lactates, lactobionates, malates, maleates, mandelates, methanesulfonates, methylbromides, methylnitrates, methylsulfates, mucates, napsylates, nitrates, oxalates, pamoates, pantothenates, phenylacetates, phosphates/diphosphates, polygalacturonates, propionates, salicylates, stearates, subacetates, succinates, sulfamides, sulfates, tannates, tartrates, teoclates, toluenesulfonates, triethiodides, triflu
• the pharmaceutically acceptable salts of the present invention can be synthesized from the parent compound which contains a basic or acidic moiety by conventional chemical methods. Generally, such salts can be prepared by reacting the free acid or base forms of these compounds with a sufficient amount of the appropriate base or acid in water or in an organic diluent like ether, ethyl acetate, ethanol, isopropanol, or acetonitrile, or a mixture thereof.
• Salts of other acids than those mentioned above which for example are useful for purifying or isolating the compounds of the present invention e.g. trifluoro acetate salts
• Salts of other acids than those mentioned above which for example are useful for purifying or isolating the compounds of the present invention also comprise a part of the invention.
• prodrugs of compounds of the invention include those compounds that, upon simple chemical transformation, are modified to produce compounds of the invention. Simple chemical transformations include hydrolysis, oxidation and reduction. Specifically, when a prodrug is administered to a patient, the prodrug may be transformed into a compound disclosed hereinabove, thereby imparting the desired pharmacological effect.
• Compounds of the invention also include their isotopically-labelled forms.
• An isotopically- labelled form of an active agent of a combination of the present invention is identical to said active agent but for the fact that one or more atoms of said active agent have been replaced by an atom or atoms having an atomic mass or mass number different from the atomic mass or mass number of said atom which is usually found in nature.
• isotopes which are readily available commercially and which can be incorporated into an active agent of a combination of the present invention in accordance with well established procedures, include isotopes of hydrogen, carbon, nitrogen, oxygen, phosphorous, fluorine and chlorine, e.g., 2 H, 3 H, 13 C, 14 C, 15 N, 18 0, 17 0, 31 P, 32 P, 35 S, 18 F, and 36 CI, respectively.
• An active agent of a combination of the present invention, a prodrug thereof, or a pharmaceutically acceptable salt of either which contains one or more of the above-mentioned isotopes and/or other isotopes of other atoms is contemplated to be within the scope of the present invention.
• the compounds of the invention are only those which are contemplated to be “chemically stable” as will be appreciated by those skilled in the art.
• a compound which would have a "dangling valency", or a “carbanion” are not compounds contemplated by the inventive methods disclosed herein.
• reaction progress is monitored by thin layer chromatography (TLC) or HPLC-MS.
• TLC thin layer chromatography
• HPLC-MS HPLC-MS
• the compounds of the invention may be prepared by the general methods and examples presented below and methods known to those of ordinary skill in the art. Optimum reaction conditions and reaction times may vary depending on the particular reactants used. Unless otherwise specified, solvents, temperatures, pressures, and other reaction conditions may be readily selected by one of ordinary skill in the art. Specific procedures are provided in the Synthetic Examples section. Intermediates used in the syntheses below are either commercially available or easily prepared by methods known to those skilled in the art. Reaction progress may be monitored by conventional methods such as thin layer chromatography (TLC) or high pressure liquid chromatography-mass spec (HPLC-MS). Intermediates and products may be purified by methods known in the art, including column chromatography, HPLC, preparative TLC or recrystallization.
• TLC thin layer chromatography
• HPLC-MS high pressure liquid chromatography-mass spec
• the compounds of the invention are generally prepared by reacting a carboxylic acid intermediate of formula INT-1 with an amine intermediate of formula INT-2 under appropriate conditions as depicted below in Scheme 1 .
• the title compound is synthesized from 6-Amino-4-methyl-3',4',5',6'-tetrahydro-2'H- [3,4']bipyridinyl-1 '-carboxylic acid fe/t-butyl ester (51 1 mg, 1.75 mmol) according to the procedure described for the synthesis of the intermediate 4-methoxy-5-piperazin-1-yl-pyridin- 2-ylamine dihydrochloride.
• the title compound is synthesized from 6-amino-4-methoxy-3',6'-dihydro-2'H-[3,4']bipyridinyl- 1 '-carboxylic acid fe/t-butyl ester (750 mg, 2.46 mmol) according to the procedure described for the synthesis of the intermediate 6-amino-4-methyl-3',4',5',6'-tetrahydro-2'H- [3,4']bipyridinyl-1 '-carboxylic acid fe/t-butyl ester
• the title compound is synthesized from 6-amino-4-methoxy-3',4',5',6'-tetrahydro-2'H- [3,4']bipyridinyl-1 '-carboxylic acid fe/t-butyl ester (715 mg, 2.33 mmol) according to the procedure described for the synthesis of the intermediate 4-methoxy-5-piperazin-1-yl-pyridin- 2-ylamine dihydrochloride.
• the title compound is synthesized from 4-(4,4,5,5-tetramethyl-[1 ,3,2]dioxaborolan-2-yl)-3,6- dihydro-2H-pyridine-1 -carboxylic acid ie f-butyl ester (977 mg, 3.16 mmol) and 6-chloro- pyridazin-3-ylamine (500 mg, 2.87 mmol) according to the procedure described for the synthesis of the intermediate 6-amino-4-methoxy-3',6'-dihydro-2'H-[3,4']bipyridinyl-1 '- carboxylic acid ie f-butyl ester.
• the title compound is synthesized from 4-(6-amino-pyridazin-3-yl)-3,6-dihydro-2H-pyridine-1- carboxylic acid ie f-butyl ester (5.40 g, 19.5 mmol) according to the procedure described for the synthesis of the intermediate 6-amino-4-methyl-3',4',5',6'-tetrahydro-2'H-[3,4']bipyridinyl- 1 '-carboxylic acid ie/f-butyl ester.
• the title compound is synthesized from (R)-4-(6-amino-4-methyl-pyridin-3-yl)-2- hydroxymethyl-piperazine-1-carboxylic acid fe/t-butyl ester (450 mg, 1 .40 mmol) according to the procedure described for the synthesis of the intermediate 4-methoxy-5-piperazin-1-yl- pyridin-2-ylamine dihydrochloride.
• the title compound is synthesized from 5-bromo-4-methoxy-pyridin-2-ylamine (2.00 g, 9.85 mmol) according to the procedure described for the synthesis of the intermediate 5-bromo-2- (2,5-dimethyl-pyrrol-1 -yl)-4-methyl-pyridine.
• the title compound is synthesized from 7-[6-(2,5-dimethyl-pyrrol-1 -yl)-4-methoxy-pyridin-3- yl]-4,7-diaza-spiro[2.5]octane-4-carboxylic acid ie f-butyl ester (1 .51 g, 3.66 mmol) according to the procedure described for the synthesis of the intermediate (R)-4-(6-amino-4-methyl- pyridin-3-yl)-2-hydroxymethyl-piperazine-1-carboxylic acid fe/t-butyl ester
• the title compound is synthesized from 7-(6-amino-4-methoxy-pyridin-3-yl)-4,7-diaza- spiro[2.5]octane-4-carboxylic acid fe/t-butyl ester (1 .07 g, 3.19 mmol) according to the procedure described for the synthesis of the intermediate 4-methoxy-5-piperazin-1-yl-pyridin- 2-ylamine dihydrochloride.
• the title compound is synthesized from 4-(4,4,5,5-tetramethyl-[1 ,3,2]dioxaborolan-2-yl)-3,6- dihydro-2H-pyridine-1 -carboxylic acid ie f-butyl ester (1 .74 g, 5.64 mmol) and 6-chloro-4- methoxy-pyridazin-3-ylamine (900 mg, 5.64 mmol) according to the procedure described for the synthesis of the intermediate 6-amino-4-methoxy-3',6'-dihydro-2'H-[3,4']bipyridinyl-1 '- carboxylic acid ie/f-butyl ester
• the title compound is synthesized from fe/f-butyl 4-(4,4,5,5-tetramethyl-1 ,3,2-dioxaborolan-2- yl)-1 ,2,3,6-tetrahydropyridine-1 -carboxylate (4.76 g, 20 mmol) and fe/f-butyl N-(6-chloro-5- methoxypyridazin-3-yl)carbamate (4.00 g, 20 mmol) according to the procedure described for the synthesis of the intermediate 6-amino-4-methoxy-3',6'-dihydro-2'H-[3,4']bipyridinyl-1 '- carboxylic acid ie f-butyl ester.
• the title compound is synthesized from tert-butyl 4-(6- ⁇ [(tert-butoxy)carbonyl]amino ⁇ -4- methoxypyridazin-3-yl)piperidine-1 -carboxylate (1 .42 g, 3.48 mmol) according to the procedure described for the synthesis of 4-methoxy-5-piperazin-1 -yl-pyridin-2-ylamine dihydrochloride.
• the title compound is synthesized from (R)-4-(6-amino-4-methyl-pyridin-3-yl)-2- methoxymethyl-piperazine-1 -carboxylic acid ie f-butyl ester (440 mg, 1.25 mmol) according to the procedure described for the synthesis of the intermediate 4-methoxy-5-piperazin-1-yl- pyridin-2-ylamine dihydrochloride.
• the title compound is synthesized from 4-(4,4,5,5-tetramethyl-[1 ,3,2]dioxaborolan-2-yl)-3,6- dihydro-2H-pyridine-1 -carboxylic acid ie/f-butyl ester (538 mg, 1.74 mmol) and 6-chloro-5- methyl-pyridazin-3-ylamine (250 mg, 1 .74 mmol) according to the procedure described for the synthesis of the intermediate 6-Amino-4-methyl-3',6'-dihydro-2'H-[3,4']bipyridinyl-1 '- carboxylic acid ie f-butyl ester.
• the title compound is synthesized from 4-(6-amino-4-methyl-pyridazin-3-yl)-3,6-dihydro-2H- pyridine-1 -carboxylic acid fe/f-butyl ester (326 mg, 1 .12 mmol) according to the procedure described for the synthesis of the intermediate 6-amino-4-methyl-3',4',5',6'-tetrahydro-2'H- [3, 4']bipyridinyl-1 '-carboxylic acid fe/f-butyl ester.
• the title compound is synthesized from 4-(6-amino-4-methyl-pyridazin-3-yl)-piperidine-1 - carboxylic acid ie f-butyl ester (175 mg, 0.60 mmol) according to the procedure described for the synthesis of the intermediate 5-piperazin-1-yl-pyridin-2-ylamine dihydrochloride.
• the title compound is synthesized from 5-bromo-4-methoxy-pyridin-2-ylamine (10.6 g, 52.1 mmol) according to the procedure described for the synthesis of the intermediate 5-bromo-2- (2,5-dimethyl-pyrrol-1 -yl)-4-methyl-pyridine.
• the mixture is degassed with nitrogen for 5 min, and stirred for 4 h at 100°C.
• the reaction mixture is filtered through a pad of silica gel and eluted with EtOAc. The filtrate is concentrated under reduced pressure and the residue is purified by reverse phase column chromatography to give the title compound.
• the title compound is synthesized from (R)-4-(6-amino-4-methoxy-pyridin-3-yl)-2- hydroxymethyl-piperazine-1-carboxylic acid fe/t-butyl ester (620 mg, 1 .83 mmol) according to the procedure described for the synthesis of the intermediate 4-methoxy-5-piperazin-1-yl- pyridin-2-ylamine dihydrochloride.
• the title compound is synthesized from 3-[6-(2,5-dimethyl-pyrrol-1 -yl)-4-methoxy-pyridin-3- yl]-3,8-diaza-bicyclo[3.2.1 ]octane-8-carboxylic acid ie f-butyl ester (760 mg, 1.84 mmol) according to the procedure described for the synthesis of the intermediate 4-(6-amino-4- methoxy-pyridin-3-yl)-piperazine-1 -carboxylic acid fe/t-butyl ester.
• the title compound is synthesized from 3-(6-amino-4-methoxy-pyridin-3-yl)-3,8-diaza- bicyclo[3.2.1]octane-8-carboxylic acid fe/t-butyl ester (330 mg, 0.99 mmol) according to the procedure described for the synthesis of the intermediate 4-methoxy-5-piperazin-1-yl-pyridin- 2-ylamine dihydrochloride.
• tert-Butyl(chloro)dimethylsilane (1.30 g, 8.64 mmol) is added to 4-benzyl 1 -ferf-butyl (2R)-2- (1 -hydroxyethyl)piperazine-1 ,4-dicarboxylate (2.10 g, 5.76 mmol) and imidazole (1 .18 g, 17.29 mmol) in dichloromethane (15 mL). The reaction mixture is stirred overnight. After adding water (10 mL), the aqueous layer is extracted with dichloromethane (2 x 25 mL). The combined organic layers are washed with brine. The organic layer is dried, filtered and concentrated under reduced pressure. The residue is purified by silica chromatography.
• the title compound is synthesized from 5-bromo-4-methoxy-pyridin-2-ylamine (202 mg, 1 .00 mmol) and 7-(4,4,5,5-tetramethyl-[1 ,3,2]dioxaborolan-2-yl)-3-oxa-9-aza-bicyclo[3.3.1]non-6- ene-9-carboxylic acid fe/t-butyl ester (350 mg, 1 .00 mmol) according to the procedure described for the synthesis of the intermediate 6-amino-4-methyl-3',6'-dihydro-2'H- [3,4']bipyridinyl-1 '-carboxylic acid fe/t-butyl ester.
• the title compound is synthesized from 7-(6-amino-4-methoxy-pyridin-3-yl)-3-oxa-9-aza- bicyclo[3.3.1]nonane-9-carboxylic acid fe/t-butyl ester (145 mg, 0.41 mmol) according to the procedure described for the synthesis of the intermediate 4-methoxy-5-piperazin-1-yl-pyridin- 2-ylamine dihydrochloride.
• the title compound is synthesized from 5-bromo-2-(2,5-dimethyl-pyrrol-1 -yl)-4-methoxy- pyridine (3.25 g, 1 1 .6 mmol) and (S)-2-(fe/f-butyl-dimethyl-silanyloxymethyl)-piperazine-1- carboxylic acid ie f-butyl (3.82 g, 1 1.6 mmol) ester according to the procedure described for the synthesis of the intermediate 3-[6-(2,5-dimethyl-pyrrol-1 -yl)-4-methoxy-pyridin-3-yl]-3,8- diaza-bicyclo[3.2.1 ]octane-8-carboxylic acid ie f-butyl ester.
• the title compound is synthesized from (S)-4-(6-amino-4-methoxy-pyridin-3-yl)-2- hydroxymethyl-piperazine-1-carboxylic acid fe/t-butyl ester (264 mg, 0.58 mmol) according to the procedure described for the synthesis of the intermediate 4-methoxy-5-piperazin-1-yl- pyridin-2-ylamine dihydrochloride.
• the title compound is synthesized from (RJ-4-(6-amino-4-methoxy-pyridin-3-yl)-2- methoxymethyl-piperazine-1 -carboxylic acid ie f-butyl ester (440 mg, 1.25 mmol) according to the procedure described for the synthesis of the intermediate [(R)-4-(6-amino-4-methoxy- pyridin-3-yl)-piperazin-2-yl]-methanol hydrochloride.
• the title compound is synthesized from 4-methoxy-5-phenoxy-pyridine-2-carbonitrile (1 1 .5 g, 50.8 mmol) according to the procedure described for the synthesis of the intermediate 5-(4- fluoro-phenoxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-(4-isopropoxy-phenoxy)-4-methoxy-pyridine-2- carbonitrile (200 mg, 0.70 mmol) according to the procedure described for the synthesis of the intermediate 5-(4-fluoro-phenoxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-fluoro-4-methoxy-pyridine-2-carbonitrile (500 mg, 3.29 mmol) and 4-methoxyphenol (490 mg, 3.94 mmol) according to the procedure described for the synthesis of the intermediate 4-methoxy-5-phenoxy-pyridine-2-carbonitrile.
• the title compound is synthesized from 4-methoxy-5-(4-methoxy-phenoxy)-pyridine-2- carbonitrile (740 mg, 2.89 mmol) according to the procedure described for the synthesis of the intermediate 5-(4-fluoro-phenoxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 4-methoxy-5-(4-trifluoromethyl-phenoxy)-pyridine-2- carbonitrile (151 mg, 0.51 mmol) according to the procedure described for the synthesis of the intermediate 5-(4-fluoro-phenoxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-fluoro-4-methoxy-pyridine-2-carbonitrile (500 mg, 3.29 mmol) and 4-chlorophenol (507 mg, 3.94 mmol) according to the procedure described for the synthesis of the intermediate 4-methoxy-5-phenoxy-pyridine-2-carbonitrile.
• the title compound is synthesized from 5-(4-chloro-phenoxy)-4-methoxy-pyridine-2- carbonitrile (645 mg, 2.47 mmol) according to the procedure described for the synthesis of the intermediate 5-(4-fluoro-phenoxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-(4-difluoromethoxy-phenoxy)-4-methoxy-pyridine- 2-carbonitrile (98.0 mg, 0.34 mmol) according to the procedure described for the synthesis of the intermediate 5-(4-fluoro-phenoxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-(4-cyclopropoxy-phenoxy)-4-methoxy-pyridine-2- carbonitrile (100 mg, 0.35 mmol) according to the procedure described for the synthesis of the intermediate 5-(4-fluoro-phenoxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 4-methoxy-5-(4-trifluoromethoxy-phenoxy)-pyridine- 2-carbonitrile (150 mg, 0.48 mmol) according to the procedure described for the synthesis of the intermediate 5-(4-Fluoro-phenoxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carb-oxylic acid methyl ester (130 mg, 0.71 mmol) and cyclobutyl-methanol (91.7 mg, 1 .07 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4- methoxy-pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (130 mg, 0.71 mmol) and (l-methyl-cyclopropyl)-methanol (103 mg, 1 .07 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro- benzyloxy)-4-methoxy-pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (130 mg, 0.71 mmol) and cyclohexanol (1 1 1 ⁇ _, 1.07 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy- pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (130 mg, 0.71 mmol) and (4-fluoro-phenyl)-methanol (1 15 ⁇ _, 1.07 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro- benzyloxy)-4-methoxy-pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 5-(4-fluoro-benzyloxy)-4-methoxy-pyridine-2- carboxylic acid methyl ester (150 mg, 0.44 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (130 mg, 0.71 mmol) and cyclopentanol (96.7 ⁇ _, 1.07 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy- pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (1 18 mg, 0.64 mmol) and isobutylalcohol (71 .6 mg, 0.97 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy- pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 5-isobutoxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (141 mg, 0.59 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (130 mg, 0.71 mmol) and cyclopropylmethanol (84.2 ⁇ _, 1 .07 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4- methoxy-pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 5-cyclopropylmethoxy-4-methoxy-pyridine-2- carboxylic acid methyl ester (325 mg, 1.37 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (1 18 mg, 0.64 mmol) and benzylalcohol (100 ⁇ _, 0.97 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy- pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 5-benzyloxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (140 mg, 0.51 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (1 18 mg, 0.64 mmol) and (3,3-difluoro-cyclobutyl)-methanol (150 mg, 0.82 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro- benzyloxy)-4-methoxy-pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 5-(3,3-difluoro-cyclobutylmethoxy)-4-methoxy- pyridine-2-carboxylic acid methyl ester (1 10 mg, 0.38 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy-pyridine-2- carboxylic acid.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (130 mg, 0.71 mmol) and 1 -propanol (80.0 ⁇ _, 1 .07 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy- pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 4-methoxy-5-propoxy-pyridine-2-carboxylic acid methyl ester (1 14 mg, 0.51 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (130 mg, 0.71 mmol) and 2-cyclopropylethanol (91 .7 mg, 1.07 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4- methoxy-pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 5-(2-cyclopropyl-ethoxy)-4-methoxy-pyridine-2- carboxylic acid methyl ester (130 mg, 0.52 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (130 mg, 0.71 mmol) and 2-phenylethanol (128 ⁇ _, 1 .07 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy- pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 4-methoxy-5-phenethyloxy-pyridine-2-carboxylic acid methyl ester (177 mg, 0.62 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (130 mg, 0.71 mmol) and 2,2-dimethyl-propan-1 -ol (93.8 mg, 1 .07 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro- benzyloxy)-4-methoxy-pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 5-(2,2-dimethyl-propoxy)-4-methoxy-pyridine-2- carboxylic acid methyl ester (160 mg, 0.63 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (1 18 mg, 0.64 mmol) and (l-fluoromethyl-cyclopropyl)-methanol (101 mg, 0.97 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro- benzyloxy)-4-methoxy-pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 5-(1-fluoromethyl-cyclopropylmethoxy)-4-methoxy- pyridine-2-carboxylic acid methyl ester (159 mg, 0.59 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy-pyridine-2- carboxylic acid.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (130 mg, 0.71 mmol) and ethanol (62.1 ⁇ _, 1.07 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy- pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 5-ethoxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (151 mg, 0.71 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (1 18 mg, 0.64 mmol) and (R)-l-cyclopropyl-ethanol (83.2 mg, 0.97 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro- benzyloxy)-4-methoxy-pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 5-((S)-1-cyclopropyl-ethoxy)-4-methoxy-pyridine-2- carboxylic acid methyl ester (102 mg, 0.41 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy-pyridine-2-carboxylic acid. Yield: 96.0 mg (100%) R t (HPLC): 0.51 min (Method 1 ) 5-lsopropoxy-4-methoxy-pyridine-2-carboxylic acid methyl ester
• the title compound is synthesized from 5-hydroxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (130 mg, 0.71 mmol) and propan-2-ol (81 .5 ⁇ _, 0.97 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy- pyridine-2-carboxylic acid methyl ester.
• the title compound is synthesized from 5-isopropoxy-4-methoxy-pyridine-2-carboxylic acid methyl ester (154 mg, 0.68 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from 5-((R)-1-cyclopropyl-ethoxy)-4-methoxy-pyridine-2- carboxylic acid methyl ester (101 mg, 0.40 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro-benzyloxy)-4-methoxy-pyridine-2-carboxylic acid.
• the title compound is synthesized from methyl 5-hydroxy-4-methoxypyridine-2-carboxylate (53 mg, 0.29 mmol) and [3-(trifluoromethyl)cyclobutyl]methanol (45 mg, 0.29 mmol) according to the procedure described for the synthesis of the intermediate 5-(2-fluoro- benzyloxy)-4-methoxy-pyridine-2-carboxylic acid methyl ester.
• Aqueous 4M NaOH solution (0.52 mL, 2.08 mmol) is added to methyl 4-methoxy-5-(3,3,3- trifluoro-2-methylpropoxy)pyridine-2-carboxylate (160 mg, 0.55 mmol) in methanol.
• the reaction mixture is stirred 2h at RT.
• the reaction mixture is neutralized with aqueous 4M HCI solution and evaporated under reduced pressure. The residue is used without further purification.
• the title compound is synthesized from [(/?)-4-(6-nitro-pyridin-3-yl)-piperazin-2-yl]-methanol hydrochloride (60.0 mg, 0.22 mmol) and 4-methoxy-5-(4-methoxy-phenoxy)-pyridine-2- carboxylic acid (48.1 mg, 0.18 mmol) according to the procedure described for the synthesis of the intermediate [(/?)-2-hydroxymethyl-4-(6-nitro-pyridin-3-yl)-piperazin-1 -yl]-(4-methoxy-5- phenoxy-pyridin-2-yl)-methanone.
• the resulting mixture is stirred at 90 °C for 4 h.
• the reaction mixture is then poured into ice water and extracted with DCM (50 mL x 3).
• the combined organic phases are washed with brine, dried over anhydrous Na 2 S0 4 , filtered and concentrated.
• the residue is purified by column chromatography on silica gel to give the desired product.
• reaction mixture is stirred at 100°C for 24h.
• the reaction mixture is diluted with EtOAc (10 mL) and filtered through a pad of SuperCell filtration agent. The filtrate is concentrated and purified by column chromatography on silica gel to afford the desired product.
• 4-Ethoxy-5-(piperidin-4-yl)pyridin-2-amine dihydrochloride can be synthesized analogous to the protocol for the synthesis of 5-(piperidin-4-yl)-4-propoxypyridin-2-amine dihydrochloride.
• Alkylation of 2-aminopyridin-4-ol with ethylbromide and subsequent Boc protection leads to the formation of ie f-butyl N-(4-ethoxypyridin-2-yl)carbamate.
• reaction mixture is cooled to 0 °C and acetic acid (6.5 mL) is added.
• the reaction mixture is stirred at 0 °C for 30 min.
• Hydrogen peroxide 11 .5 mL, 30% solution
• the reaction mixture is stirred at RT overnight.
• the reaction mixture is quenched with saturated aqueous NaS 2 0 4 . 5N HCI is added to the reaction mixture.
• EtOAc 50 mL x 3
• the combined organic phases are washed with water and brine, dried over anhydrous Na 2 S0 4 , filtered and concentrated under reduced pressure.
• the residue is purified by silica gel chromatography to give the desired product.
• 4- yl ⁇ pyridin-2-amine (292 mg, 0.62 mmol) is further separated by chiral supercritical fluid chromatography (SFC, supercritical carbondioxide/20 mM NH 3 in EtOH, Chiral ART,® Amylose-SC 20x250 mm, 5 ⁇ ) to obtain both enantiomers 94a (first eluting fraction) and 94b (second eluting fraction).
• SFC supercritical carbondioxide/20 mM NH 3 in EtOH, Chiral ART,® Amylose-SC 20x250 mm, 5 ⁇
• reaction mixture is stirred at 60°C for 1 h. If the reaction shows complete conversion, the reaction mixture is purified by RP column chromatography (ACN/water + TFA). If reaction does not show completion, additional TPP (2.7 eq.) and DTAD (2.5 eq.) are added until conversion occurs. After each addition the reaction mixture is stirred at 60°C for 1 h. The reaction mixture is purified by RP column chromatography (ACN/water + TFA).

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