Patent Application
20210107920
The present invention relates to organic compounds useful for therapy or prophylaxis in a mammal, and in particular to monoacylglycerol lipase (MAGL) inhibitors for the treatment or prophylaxis of neuroinflammation, neurodegenerative diseases, pain, cancer, mental disorders, multiple sclerosis, Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, traumatic brain injury, neurotoxicity, stroke, epilepsy, anxiety, migraine and/or depression in a mammal.
Endocannabinoids (ECs) are signaling lipids that exert their biological actions by interacting with cannabinoid receptors (CBRs), CB1 and CB2. They modulate multiple physiological processes including neuroinflammation, neurodegeneration and tissue regeneration (Iannotti, F. A., et al., Progress in lipid research 2016, 62, 107-28.). In the brain, the main endocannabinoid, 2-arachidonoylglycerol (2-AG), is produced by diacyglycerol lipases (DAGL) and hydrolyzed by the monoacylglycerol lipase, MAGL. MAGL hydrolyses 85% of 2-AG; the remaining 15% being hydrolysed by ABHD6 and ABDH12 (Nomura, D. K., et al., Science 2011, 334, 809.). MAGL is expressed throughout the brain and in most brain cell types, including neurons, astrocytes, oligodendrocytes and microglia cells (Chanda, P. K., et al., Molecular pharmacology 2010, 78, 996; Viader, A., et al., Cell reports 2015, 12, 798.). 2-AG hydrolysis results in the formation of arachidonic acid (AA), the precursor of prostaglandins (PGs) and leukotrienes (LTs). Oxidative metabolism of AA is increased in inflamed tissues. There are two principal enzyme pathways of arachidonic acid oxygenation involved in inflammatory processes, the cyclo-oxygenase which produces PGs and the 5-lipoxygenase which produces LTs. Of the various cyclooxygenase products formed during inflammation, PGE2 is one of the most important. These products have been detected at sites of inflammation, e.g. in the cerebrospinal fluid of patients suffering from neurodegenerative disorders and are believed to contribute to inflammatory response and disease progression. Mice lacking MAGL (Mgll−/−) exhibit dramatically reduced 2-AG hydrolase activity and elevated 2-AG levels in the nervous system while other arachidonoyl-containing phospho- and neutral lipid species including anandamide (AEA), as well as other free fatty acids, are unaltered. Conversely, levels of AA and AA-derived prostaglandins and other eicosanoids, including prostaglandin E2 (PGE2), D2 (PGD2), F2 (PGF2), and thromboxane B2 (TXB2), are strongly decreased. Phospholipase A2 (PLA2) enzymes have been viewed as the principal source of AA, but cPLA2-deficient mice have unaltered AA levels in their brain, reinforcing the key role of MAGL in the brain for AA production and regulation of the brain inflammatory process.
Neuroinflammation is a common pathological change characteristic of diseases of the brain including, but not restricted to, neurodegenerative diseases (e.g. multiple sclerosis, Alzheimer's disease, Parkinson disease, amyotrophic lateral sclerosis, traumatic brain injury, neurotoxicity, stroke, epilepsy and mental disorders such as anxiety and migraine). In the brain, production of eicosanoids and prostaglandins controls the neuroinflammation process. The pro-inflammatory agent lipopolysaccharide (LPS) produces a robust, time-dependent increase in brain eicosanoids that is markedly blunted in Mgll−/− mice. LPS treatment also induces a widespread elevation in pro-inflammatory cytokines including interleukin-1-a (IL-1-a), IL-1b, IL-6, and tumor necrosis factor-a (TNF-a) that is prevented in Mgll−/− mice.
Neuroinflammation is characterized by the activation of the innate immune cells of the central nervous system, the microglia and the astrocytes. It has been reported that anti-inflammatory drugs can suppress in preclinical models the activation of glia cells and the progression of disease including Alzheimer's disease and multiple sclerosis (Lleo A., Cell Mol Life Sci. 2007, 64, 1403.). Importantly, genetic and/or pharmacological disruption of MAGL activity also blocks LPS-induced activation of microglial cells in the brain (Nomura, D. K., et al., Science 2011, 334, 809.).
In addition, genetic and/or pharmacological disruption of MAGL activity was shown to be protective in several animal models of neurodegeneration including, but not restricted to, Alzheimer's disease, Parkinson's disease and multiple sclerosis. For example, an irreversible MAGL inhibitor has been widely used in preclinical models of neuroinflammation and neurodegeneration (Long, J. Z., et al., Nature chemical biology 2009, 5, 37.). Systemic injection of such inhibitor recapitulates the Mgll−/− mice phenotype in the brain, including an increase in 2-AG levels, a reduction in AA levels and related eicosanoids production, as well as the prevention of cytokines production and microglia activation following LPS-induced neuroinflammation (Nomura, D. K., et al., Science 2011, 334, 809.), altogether confirming that MAGL is a druggable target.
Consecutive to the genetic and/or pharmacological disruption of MAGL activity, the endogenous levels of the MAGL natural substrate in the brain, 2-AG, are increased. 2-AG has been reported to show beneficial effects on pain with, for example, anti-nociceptive effects in mice (Ignatowska-Jankowska B. et al., J Pharmacol. Exp. Ther. 2015, 353, 424.) and on mental disorders, such as depression in chronic stress models (Zhong P. et al., Neuropsychopharmacology 2014, 39, 1763.).
Furthermore, oligodendrocytes (OLs), the myelinating cells of the central nervous system, and their precursors (OPCs) express the cannabinoid receptor 2 (CB2) on their membrane. 2-AG is the endogenous ligand of CB1 and CB2 receptors. It has been reported that both cannabinoids and pharmacological inhibition of MAGL attenuate OLs's and OPCs's vulnerability to excitotoxic insults and therefore may be neuroprotective (Bemal-Chico, A., et al., Glia 2015, 63, 163.). Additionally, pharmacological inhibition of MAGL increases the number of myelinating OLs in the brain of mice, suggesting that MAGL inhibition may promote differentiation of OPCs in myelinating OLs in vivo (Alpar, A., et al., Nature communications 2014, 5, 4421.). Inhibition of MAGL was also shown to promote remyelination and functional recovery in a mouse model of progressive multiple sclerosis (Feliu A. et al., Journal of Neuroscience 2017, 37 (35), 8385.).
Finally, in recent years, metabolism is talked highly important in cancer research, especially the lipid metabolism. Researchers believe that the de novo fatty acid synthesis plays an important role in tumor development. Many studies illustrated that endocannabinoids have anti-tumorigenic actions, including anti-proliferation, apoptosis induction and anti-metastatic effects. MAGL as an important decomposing enzyme for both lipid metabolism and the endocannabinoids system, additionally as a part of a gene expression signature, contributes to different aspects of tumourigenesis (Qin, H., et al., Cell Biochem. Biophys. 2014, 70, 33; Nomura D K et al., Cell 2009, 140(1), 49-61; Nomura D K et al., Chem. Biol. 2011, 18(7), 846-856).
In conclusion, suppressing the action and/or the activation of MAGL is a promising new therapeutic strategy for the treatment or prevention of neuroinflammation, neurodegenerative diseases, pain, cancer and mental disorders. Furthermore, suppressing the action and/or the activation of MAGL is a promising new therapeutic strategy for providing neuroprotection and myelin regeneration. Accordingly, there is a high unmet medical need for new MAGL inhibitors.
In a first aspect, the present invention provides compounds of Formula (Ic)
In a further aspect, the present invention provides a process of manufacturing the compounds of formula (Ic) as described herein, comprising:
In a further aspect, the present invention provides a compound of formula (Ic) as described herein, when manufactured according to the processes described herein.
In a further aspect, the present invention provides a compound of formula (Ic) as described herein, for use as therapeutically active substance.
In a further aspect, the present invention provides a pharmaceutical composition comprising a compound of formula (Ic) as described herein and a therapeutically inert carrier.
In a further aspect, the present invention provides the use of a compound of formula (Ic) as described herein for inhibiting monoacylglycerol lipase (MAGL) in a mammal.
In a further aspect, the present invention provides the use of a compound of formula (Ic) as described herein for the treatment or prophylaxis of neuroinflammation, neurodegenerative diseases, pain, cancer and/or mental disorders in a mammal.
In a further aspect, the present invention provides the use of a compound of formula (Ic) as described herein for the treatment or prophylaxis of multiple sclerosis, Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, traumatic brain injury, neurotoxicity, stroke, epilepsy, anxiety, migraine, depression, hepatocellular carcinoma, colon carcinogenesis, ovarian cancer, neuropathic pain, chemotherapy induced neuropathy, acute pain, chronic pain and/or spasticity associated with pain in a mammal.
In a further aspect, the present invention provides a compound of formula (Ic) as described herein for use in a method of inhibiting monoacylglycerol lipase in a mammal.
In a further aspect, the present invention provides a compound of formula (Ic) as described herein for use in the treatment or prophylaxis of neuroinflammation, neurodegenerative diseases, pain, cancer and/or mental disorders in a mammal.
In a further aspect, the present invention provides a compound of formula (Ic) as described herein, for use in the treatment or prophylaxis of multiple sclerosis, Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, traumatic brain injury, neurotoxicity, stroke, epilepsy, anxiety, migraine, depression, hepatocellular carcinoma, colon carcinogenesis, ovarian cancer, neuropathic pain, chemotherapy induced neuropathy, acute pain, chronic pain and/or spasticity associated with pain in a mammal.
In a further aspect, the present invention provides the use of a compound of formula (Ic) as described herein for the preparation of a medicament for inhibiting monoacylglycerol lipase in a mammal.
In a further aspect, the present invention provides the use of a compound of formula (Ic) as described herein for the preparation of a medicament for the treatment or prophylaxis of neuroinflammation, neurodegenerative diseases, pain, cancer and/or mental disorders in a mammal.
In a further aspect, the present invention provides the use of a compound of formula (Ic) as described herein for the preparation of a medicament for the treatment or prophylaxis of multiple sclerosis, Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, traumatic brain injury, neurotoxicity, stroke, epilepsy, anxiety, migraine, depression, hepatocellular carcinoma, colon carcinogenesis, ovarian cancer, neuropathic pain, chemotherapy induced neuropathy, acute pain, chronic pain and/or spasticity associated with pain in a mammal.
In a further aspect, the present invention provides a method for inhibiting monoacylglycerol lipase in a mammal, which method comprises administering an effective amount of a compound of formula (Ic) as described herein to the mammal.
In a further aspect, the present invention provides a method for the treatment or prophylaxis of neuroinflammation, neurodegenerative diseases, pain, cancer and/or mental disorders in a mammal, which method comprises administering an effective amount of a compound of formula (Ic as described herein to the mammal.
In a further aspect, the present invention provides a method for the treatment or prophylaxis of multiple sclerosis, Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, traumatic brain injury, neurotoxicity, stroke, epilepsy, anxiety, migraine, depression, hepatocellular carcinoma, colon carcinogenesis, ovarian cancer, neuropathic pain, chemotherapy induced neuropathy, acute pain, chronic pain and/or spasticity associated with pain in a mammal, which method comprises administering an effective amount of a compound of formula (Ic) as described herein to the mammal.
Features, integers, characteristics, compounds, chemical moieties or groups described in conjunction with a particular aspect, embodiment or example of the invention are to be understood to be applicable to any other aspect, embodiment or example described herein, unless incompatible therewith. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive. The invention is not restricted to the details of any foregoing embodiments. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.
The term “alkyl” refers to a mono- or multivalent, e.g., a mono- or bivalent, linear or branched saturated hydrocarbon group of 1 to 12 carbon atoms. In some preferred embodiments, the alkyl group contains 1 to 6 carbon atoms, e.g., 1, 2, 3, 4, 5, or 6 carbon atoms. In other embodiments, the alkyl group contains 1 to 3 carbon atoms, e.g., 1, 2 or 3 carbon atoms. Some non-limiting examples of alkyl include methyl, ethyl, propyl, 2-propyl (isopropyl), n-butyl, iso-butyl, sec-butyl, tert-butyl, and 2,2-dimethylpropyl. A particularly preferred, yet non-limiting example of alkyl is methyl. An alkyl group may be substituted. Thus, the term “substituted alkyl” refers to an alkyl group wherein at least one of the hydrogen atoms of the alkyl group has been replaced by a substituent as described herein, preferably by a substituent selected from halogen, hydroxy, alkoxy, arylalkoxy, trialkylsilyloxy, substituted or unsubstituted cycloalkyl and substituted or unsubstituted heterocyclyl. Most preferably, “substituted alkyl” refers to an alkyl group wherein 1, 2 or 3 of the hydrogen atoms of the alkyl group have been replaced by a substituent selected from halogen, hydroxy, alkoxy, arylalkoxy, trialkylsilyloxy, substituted or unsubstituted cycloalkyl and substituted or unsubstituted heterocyclyl. Particular, yet non-limiting examples of substituted alkyl are 2-hydroxyethyl, 2-methoxyethyl, hydroxymethyl, methoxymethyl, trifluoromethyl, oxetan-3-yl-methyl, (1-tert-butoxycarbonylazetidin-3-yl)methyl, cyclopropylmethyl, 1-(chloromethyl)-2-hydroxy-ethyl, 2-[tert-butyl(dimethyl)silyl]oxyethyl and benzyloxymethyl.
The term “alkoxy” refers to an alkyl group, as previously defined, attached to the parent molecular moiety via an oxygen atom. Unless otherwise specified, the alkoxy group contains 1 to 12 carbon atoms. In some preferred embodiments, the alkoxy group contains 1 to 6 carbon atoms. In other embodiments, the alkoxy group contains 1 to 4 carbon atoms. In still other embodiments, the alkoxy group contains 1 to 3 carbon atoms. Some non-limiting examples of alkoxy groups include methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy and tert-butoxy. A particularly preferred, yet non-limiting example of alkoxy is methoxy.
The term “halogen” or “halo” refers to fluoro (F), chloro (Cl), bromo (Br), or iodo (I). Preferably, the term “halogen” or “halo” refers to fluoro (F), chloro (Cl) or bromo (Br). Particularly preferred, yet non-limiting examples of “halogen” or “halo” are fluoro (F) and chloro (Cl).
The term “cycloalkyl” as used herein refers to a saturated or partly unsaturated monocyclic or bicyclic hydrocarbon group of 3 to 10 ring carbon atoms. In some preferred embodiments, the cycloalkyl group is a saturated monocyclic hydrocarbon group of 3 to 8 ring carbon atoms. “Bicyclic cycloalkyl” refers to cycloalkyl moieties consisting of two saturated carbocycles having two carbon atoms in common, i.e., the bridge separating the two rings is either a single bond or a chain of one or two ring atoms, and to spirocyclic moieties, i.e., the two rings are connected via one common ring atom. Preferably, the cycloalkyl group is a saturated monocyclic hydrocarbon group of 3 to 6 ring carbon atoms, e.g., of 3, 4, 5 or 6 carbon atoms. Some non-limiting examples of cycloalkyl include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and cycloheptyl.
The term “cycloalkyloxy” refers to a group cycloalkyl-O—, i.e. a cycloalkyl group substituted with an oxy group and attached to the parent molecular moiety via said oxy group.
The term “heterocyclyl” as used herein refers to a saturated or partly unsaturated mono- or bicyclic, preferably monocyclic ring system of 3 to 10 ring atoms, preferably 3 to 8 ring atoms, wherein 1, 2, or 3 of said ring atoms are heteroatoms selected from N, O and S, the remaining ring atoms being carbon. Preferably, 1 to 2 of said ring atoms are selected from N and O, the remaining ring atoms being carbon. “Bicyclic heterocyclyl” refers to heterocyclic moieties consisting of two cycles having two ring atoms in common, i.e., the bridge separating the two rings is either a single bond or a chain of one or two ring atoms, and to spirocyclic moieties, i.e., the two rings are connected via one common ring atom. Some non-limiting examples of monocyclic heterocyclyl groups include azetidin-3-yl, azetidin-2-yl, oxetan-3-yl, oxetan-2-yl, 2-oxopyrrolidin-1-yl, 2-oxopyrrolidin-3-yl, 5-oxopyrrolidin-2-yl, 5-oxopyrrolidin-3-yl, 2-oxo-1-piperidyl, 2-oxo-3-piperidyl, 2-oxo-4-piperidyl, 6-oxo-2-piperidyl, 6-oxo-3-piperidyl, 1-piperidinyl, 2-piperidinyl, 3-piperidinyl, 4-piperidinyl, morpholino, morpholin-2-yl and morpholin-3-yl. A heterocyclyl group may be substituted.
Thus, the term “substituted heterocyclyl” refers to a heterocyclyl group wherein at least one of the hydrogen atoms of the heterocyclyl group has been replaced by a substituent as described herein, preferably by a substituent selected from substituted or unsubstituted alkyl, halogen and alkoxy, wherein said substituted alkyl is substituted with 1-3 substituents selected from hydroxy, halogen, alkoxy, arylalkoxy and cycloalkyl. Most preferably, “substituted heterocyclyl” refers to a heterocyclyl group wherein 1-2 of the hydrogen atoms of the heterocyclyl group have been replaced by a substituent selected from substituted or unsubstituted alkyl, halogen and alkoxy, wherein said substituted alkyl is substituted with 1-3 substituents selected from hydroxy, halogen, alkoxy, arylalkoxy and cycloalkyl. Particular, yet non-limiting examples of substituted heterocyclyl are 2-methyl-5-oxo-pyrrolidin-1-yl, 4,4-difluoro-1-piperidyl, 1-tert-butoxycarbonylazetidin-3-yl and 1-tert-butoxycarbonylazetidin-2-yl.
The term “heterocyclyloxy” refers to a group heterocyclyl-O—, i.e. a heterocyclyl group substituted with an oxy group and attached to the parent molecular moiety via said oxy group. An non-limiting example of a heterocyclyloxy group is oxetanyloxy, such as oxetan-3-yloxy.
The term “aryl” refers to a monocyclic, bicyclic, or tricyclic carbocyclic ring system having a total of 6 to 14 ring members, preferably, 6 to 12 ring members, and more preferably 6 to 10 ring members, and wherein at least one ring in the system is aromatic. Some non-limiting examples of aryl include phenyl and 9H-fluorenyl (e.g. 9H-fluoren-9-yl). A particularly preferred, yet non-limiting example of aryl is phenyl. An aryl group may be substituted. Thus, the term “substituted aryl” refers to an aryl group wherein at least one of the hydrogen atoms of the aryl group has been replaced by a substituent as described herein, for example by a substituent selected from halogen, cyano, alkoxy, haloalkoxy, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted cycloalkylalkyl, substituted or unsubstituted cycloalkyloxy, substituted or unsubstituted cycloalkyloxyalkyl, substituted or unsubstituted cycloalkylalkoxy, substituted or unsubstituted heterocyclyl, substituted or unsubstituted heterocyclyloxy, substituted or unsubstituted aryl and substituted or unsubstituted aryloxy. Preferably, the term “substituted aryl” refers to an aryl group wherein at least one of the hydrogen atoms of the aryl group has been replaced by a substituent selected from halogen and haloalkyl. Most preferably, “substituted aryl” refers to an aryl group wherein 1-3 of the hydrogen atoms of the aryl group have been replaced by a substituent selected from halogen and haloalkyl. Particular, yet non-limiting examples of substituted aryl are 4-fluorophenyl, 4-chlorophenyl, 2-chloro-4-fluoro-phenyl, 4-(trifluoromethyl)phenyl and 3,4-difluorophenyl.
The term “heteroaryl” refers to a mono- or multivalent, monocyclic, bicyclic or tricyclic, preferably bicyclic ring system having a total of 5 to 14 ring members, preferably, 5 to 12 ring members, and more preferably 5 to 10 ring members, wherein at least one ring in the system is aromatic, and at least one ring in the system contains one or more heteroatoms. Preferably, “heteroaryl” refers to a 5-10 membered heteroaryl comprising 1, 2, 3 or 4 heteroatoms independently selected from O, S and N. Most preferably, “heteroaryl” refers to a 5-10 membered heteroaryl comprising 1 to 2 heteroatoms independently selected from O and N. Some non-limiting examples of heteroaryl include spiro[cyclopropane-1,3′-indoline](e.g., spiro[cyclopropane-1,3′-indoline]-1′-yl), 2-pyridyl, 3-pyridyl, 4-pyridyl, indol-1-yl, 1H-indol-2-yl, 1H-indol-3-yl, 1H-indol-4-yl, 1H-indol-5-yl, 1H-indol-6-yl, 1H-indol-7-yl, 1,2-benzoxazol-3-yl, 1,2-benzoxazol-4-yl, 1,2-benzoxazol-5-yl, 1,2-benzoxazol-6-yl, 1,2-benzoxazol-7-yl, 1H-indazol-3-yl, 1H-indazol-4-yl, 1H-indazol-5-yl, 1H-indazol-6-yl, 1H-indazol-7-yl, pyrazol-1-yl, 1H-pyrazol-3-yl, 1H-pyrazol-4-yl, 1H-pyrazol-5-yl, imidazol-1-yl, 1H-imidazol-2-yl, 1H-imidazol-4-yl, 1H-imidazol-5-yl, oxazol-2-yl, oxazol-4-yl and oxazol-5-yl. A particularly preferred, yet non-limiting example of heteroaryl is indolyl, in particular 1H-indol-3-yl. A heteroaryl group may be substituted. Thus, the term “substituted heteroaryl” refers to a heteroaryl group wherein at least one of the hydrogen atoms of the heteroaryl group has been replaced by a substituent as described herein, preferably by a substituent selected from halogen, substituted or unsubstituted alkyl, cycloalkyl, heterocyclyl and heterocyclyl substituted with alkoxycarbonyl, wherein substituted alkyl is substituted with 1-3 substituents selected from halogen, hydroxy, heterocyclyl, trialkylsilyloxy, cycloalkyl and heterocyclyl substituted with alkoxycarbonyl. Most preferably, “substituted heteroaryl” refers to a heteroaryl group wherein 1-2 of the hydrogen atoms of the heteroaryl group have been replaced by a substituent selected from halogen, substituted or unsubstituted alkyl, cycloalkyl, heterocyclyl and heterocyclyl substituted with alkoxycarbonyl, wherein substituted alkyl is substituted with 1-3 substituents selected from halogen, hydroxy, heterocyclyl, trialkylsilyloxy, cycloalkyl and heterocyclyl substituted with alkoxycarbonyl. Particular, yet non-limiting examples of substituted heteroaryl are 5-methyl-1,2,4-oxadiazol-3-yl, 5-fluoro-1-methyl-indol-3-yl, 5-chloro-1-methyl-indol-3-yl, 5-chloro-1-cyclopropyl-indol-3-yl, 5-chloro-1-oxetanyl-indol-3-yl, 5-chloro-1-(oxetan-3-ylmethyl)indol-3-yl, 5-chloro-1-(2-hydroxyethyl)indol-3-yl, 1-(1-tert-butoxycarbonylazetidin-3-yl)-5-chloro-indol-3-yl, 1-[(1-tert-butoxycarbonylazetidin-3-yl)methyl]-5-chloro-indol-3-yl, 5-(trifluoromethyl)-2-pyridyl, 5-(trifluoromethyl)-3-pyridyl, 4-(trifluoromethyl)imidazol-1-yl, 4-(trifluoromethyl)pyrazol-1-yl, 4-tert-butylpyrazol-1-yl, 4-tert-butyloxazol-2-yl, 5-chloro-1-(cyclopropylmethyl)indol-3-yl, 6-fluoro-1H-indol-3-yl, 5-fluoro-1,2-benzoxazol-3-yl, 5-chloro-1H-indol-3-yl, 1-methylindazol-5-yl, 5-chloro-1-[1-(chloromethyl)-2-hydroxy-ethyl]indol-3-yl and 1-[2-[tert-butyl(dimethyl)silyl]oxyethyl]-5-chloro-indol-3-yl.
The term “hydroxy” refers to an —OH group.
The term “cyano” refers to a —CN (nitrile) group.
The term “cycloalkylalkyl” refers to an alkyl group, wherein at least one of the hydrogen atoms of the alkyl group has been replaced by a cycloalkyl group. Preferably, “cycloalkylalkyl” refers to an alkyl group wherein 1, 2 or 3 hydrogen atoms, most preferably 1 hydrogen atom of the alkyl group have been replaced by a cycloalkyl group. A particularly preferred, yet non-limiting example of cycloalkylalkyl is cyclopropylmethyl.
The term “haloalkyl” refers to an alkyl group, wherein at least one of the hydrogen atoms of the alkyl group has been replaced by a halogen atom, preferably fluoro. Preferably, “haloalkyl” refers to an alkyl group wherein 1, 2 or 3 hydrogen atoms of the alkyl group have been replaced by a halogen atom, most preferably fluoro. Particularly preferred, yet non-limiting examples of haloalkyl are trifluoromethyl and trifluoroethyl.
The term “haloalkoxy” refers to an alkoxy group, wherein at least one of the hydrogen atoms of the alkoxy group has been replaced by a halogen atom, preferably fluoro. Preferably, “haloalkoxy” refers to an alkoxy group wherein 1, 2 or 3 hydrogen atoms of the alkoxy group have been replaced by a halogen atom, most preferably fluoro. A particularly preferred, yet non-limiting example of haloalkoxy is trifluoromethoxy (—OCF3).
The term “cycloalkylalkoxy” refers to an alkoxy group, wherein at least one of the hydrogen atoms of the alkoxy group has been replaced by a cycloalkyl group. Preferably, “cycloalkylalkoxy” refers to an alkoxy group wherein 1, 2 or 3 hydrogen atoms, most preferably 1 hydrogen atom of the alkoxy group have been replaced by a cycloalkyl group. A particularly preferred, yet non-limiting example of cycloalkylalkoxy is cyclopropylmethoxy.
The term “cycloalkyloxyalkyl” refers to an alkyl group, wherein at least one of the hydrogen atoms of the alkyl group has been replaced by a cycloalkyloxy group as defined herein. Preferably, “cycloalkyloxyalkyl” refers to an alkyl group wherein 1, 2 or 3 hydrogen atoms, most preferably 1 hydrogen atom of the alkyl group have been replaced by a cycloalkyloxy group. A particularly preferred, yet non-limiting example of cycloalkyloxyalkyl is cyclopropoxymethyl.
The term “hydroxyalkyl” refers to an alkyl group, wherein at least one of the hydrogen atoms of the alkyl group has been replaced by a hydroxy group. Preferably, “hydroxyalkyl” refers to an alkyl group wherein 1, 2 or 3 hydrogen atoms, most preferably 1 hydrogen atom of the alkyl group have been replaced by a hydroxy group. Preferred, yet non-limiting examples of hydroxyalkyl are hydroxymethyl and hydroxyethyl (e.g. 2-hydroxyethyl). A particularly preferred, yet non-limiting example of hydroxyalkyl is hydroxymethyl.
The term “arylalkoxy” refers to an alkoxy group, wherein at least one of the hydrogen atoms of the alkoxy group has been replaced by an aryl group. Preferably, “arylalkoxy” refers to an alkoxy group wherein 1, 2 or 3 hydrogen atoms, most preferably 1 hydrogen atom of the alkoxy group have been replaced by an aryl group. A particularly preferred, yet non-limiting example of arylalkoxy is benzyloxy.
The term “arylalkoxyalkyl” refers to an alkyl group, wherein at least one of the hydrogen atoms of the alkyl group has been replaced by an arylalkoxy group as defined herein. Preferably, “arylalkoxyalkyl” refers to an alkyl group wherein 1, 2 or 3 hydrogen atoms, most preferably 1 hydrogen atom of the alkyl group have been replaced by an arylalkoxy group. A particularly preferred, yet non-limiting example of arylalkoxyalkyl is benzyloxymethyl.
The term “alkoxyalkyl” refers to an alkyl group, wherein at least one of the hydrogen atoms of the alkyl group has been replaced by an alkoxy group. Preferably, “alkoxyalkyl” refers to an alkyl group wherein 1, 2 or 3 hydrogen atoms, most preferably 1 hydrogen atom of the alkyl group have been replaced by an alkoxy group. A particularly preferred, yet non-limiting example of alkoxyalkyl is 2-methoxyethyl.
The term “alkoxycarbonyl” refers to a group alkyl-O—C(O)— (i.e. an alkylester).
The term “trialkylsilyloxy” refers to a group (alkyl)3Si—O—. A particularly preferred, yet non-limiting example of trialkylsilyloxy is [tert-butyl(dimethyl)silyl]oxy.
The term “haloaryl” refers to an aryl group, wherein at least one of the hydrogen atoms of the aryl group has been replaced by a halogen atom. Preferably, “haloaryl” refers to an aryl group wherein 1, 2 or 3 hydrogen atoms, more preferably 1 or 2 hydrogen atoms, most preferably 1 hydrogen atom of the aryl group have been replaced by a halogen atom. A particularly preferred, yet non-limiting example of haloaryl is fluorophenyl, in particular 4-fluorophenyl.
The term “pharmaceutically acceptable salt” refers to those salts which retain the biological effectiveness and properties of the free bases or free acids, which are not biologically or otherwise undesirable. The salts are formed with inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid and the like, in particular hydrochloric acid, and organic acids such as acetic acid, propionic acid, glycolic acid, pyruvic acid, oxalic acid, maleic acid, malonic acid, succinic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, cinnamic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, p-toluenesulfonic acid, salicylic acid, N-acetylcystein and the like. In addition these salts may be prepared by addition of an inorganic base or an organic base to the free acid. Salts derived from an inorganic base include, but are not limited to, the sodium, potassium, lithium, ammonium, calcium, magnesium salts and the like. Salts derived from organic bases include, but are not limited to salts of primary, secondary, and tertiary amines, substituted amines including naturally occurring substituted amines, cyclic amines and basic ion exchange resins, such as isopropylamine, trimethylamine, diethylamine, triethylamine, tripropylamine, ethanolamine, lysine, arginine, N-ethylpiperidine, piperidine, polyimine resins and the like. Particular pharmaceutically acceptable salts of compounds of formula (I) are hydrochloride salts.
The term “pharmaceutically acceptable ester” refers to esters that hydrolyze in vivo and include those that break down readily in the human body to leave the parent compound or a salt thereof. Suitable ester groups include, for example, those derived from pharmaceutically acceptable aliphatic carboxylic acids, particularly alkanoic, alkenoic, cycloalkanoic and alkanedioic acids, in which each alkyl or alkenyl moiety advantageously has not more than 6 carbon atoms. Representative examples of particular esters include, but are not limited to, formates, acetates, propionates, butyrates, acrylates and ethylsuccinates. Examples of pharmaceutically acceptable prodrug types are described in Higuchi and Stella, Pro-drugs as Novel Delivery Systems, Vol. 14 of the A.C.S. Symposium Series, and in Roche, ed., Bioreversible Carriers in Drug Design, American Pharmaceutical Association and Pergamon Press, 1987.
The term “protective group” (PG) denotes the group which selectively blocks a reactive site in a multifunctional compound such that a chemical reaction can be carried out selectively at another unprotected reactive site in the meaning conventionally associated with it in synthetic chemistry. Protective groups can be removed at the appropriate point. Exemplary protective groups are amino-protective groups, carboxy-protective groups or hydroxy-protective groups. Particular protective groups are the tert-butoxycarbonyl (Boc), benzyloxycarbonyl (Cbz), fluorenylmethoxycarbonyl (Fmoc) and benzyl (Bn). Further particular protective groups are the tert-butoxycarbonyl (Boc) and the fluorenylmethoxycarbonyl (Fmoc). More particular protective group is the tert-butoxycarbonyl (Boc). Exemplary protective groups and their application in organic synthesis are described, for example, in “Protective Groups in Organic Chemistry” by T. W. Greene and P. G. M. Wutts, 5th Ed., 2014, John Wiley & Sons, N.Y.
The term “urea forming reagent” refers to a chemical compound that is able to render a first amine to a species that will react with a second amine, thereby forming an urea derivative. Non-limiting examples of a urea forming reagent include bis(trichloromethyl) carbonate, phosgene, trichloromethyl chloroformate, (4-nitrophenyl)carbonate and 1,1′-carbonyldiimidazole. The urea forming reagents described in G. Sartori et al., Green Chemistry 2000, 2, 140 are incorporated herein by reference.
The compounds of formula (I) can contain several asymmetric centers and can be present in the form of optically pure enantiomers, mixtures of enantiomers such as, for example, racemates, optically pure diastereioisomers, mixtures of diastereoisomers, diastereoisomeric racemates or mixtures of diastereoisomeric racemates.
According to the Cahn-Ingold-Prelog Convention, the asymmetric carbon atom can be of the “R” or “S” configuration.
The abbreviation “MAGL” refers to the enzyme monoacylglycerol lipase. The terms “MAGL” and “monoacylglycerol lipase” are used herein interchangeably.
The term “treatment” as used herein includes: (1) inhibiting the state, disorder or condition (e.g. arresting, reducing or delaying the development of the disease, or a relapse thereof in case of maintenance treatment, of at least one clinical or subclinical symptom thereof); and/or (2) relieving the condition (i.e., causing regression of the state, disorder or condition or at least one of its clinical or subclinical symptoms). The benefit to a patient to be treated is either statistically significant or at least perceptible to the patient or to the physician. However, it will be appreciated that when a medicament is administered to a patient to treat a disease, the outcome may not always be effective treatment.
The term “prophylaxis” as used herein includes: preventing or delaying the appearance of clinical symptoms of the state, disorder or condition developing in a mammal and especially a human that may be afflicted with or predisposed to the state, disorder or condition but does not yet experience or display clinical or subclinical symptoms of the state, disorder or condition.
The term “neuroinflammation” as used herein relates to acute and chronic inflammation of the nervous tissue, which is the main tissue component of the two parts of the nervous system; the brain and spinal cord of the central nervous system (CNS), and the branching peripheral nerves of the peripheral nervous system (PNS). Chronic neuroinflammation is associated with neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease and multiple sclerosis. Acute neuroinflammation usually follows injury to the central nervous system immediately, e.g., as a result of traumatic brain injury (TBI).
The term “traumatic brain injury” (“TBI”, also known as “intracranial injury”), relates to damage to the brain resulting from external mechanical force, such as rapid acceleration or deceleration, impact, blast waves, or penetration by a projectile.
The term “neurodegenerative diseases” relates to diseases that are related to the progressive loss of structure or function of neurons, including death of neurons. Examples of neurodegenerative diseases include, but are not limited to, multiple sclerosis, Alzheimer's disease, Parkinson's disease and amyotrophic lateral sclerosis.
The term “mental disorders” (also called mental illnesses or psychiatric disorders) relates to behavioral or mental patterns that may cause suffering or a poor ability to function in life. Such features may be persistent, relapsing and remitting, or occur as a single episode. Examples of mental disorders include, but are not limited to, anxiety and depression.
The term “pain” relates to an unpleasant sensory and emotional experience associated with actual or potential tissue damage. Examples of pain include, but are not limited to, nociceptive pain, chronic pain (including idiopathic pain), neuropathic pain including chemotherapy induced neuropathy, phantom pain and phsychogenic pain. A particular example of pain is neuropathic pain, which is caused by damage or disease affecting any part of the nervous system involved in bodily feelings (i.e., the somatosensory system). In one embodiment, “pain” is neuropathic pain resulting from amputation or thoracotomy. In one embodiment, “pain” is chemotherapy induced neuropathy.
The term “neurotoxicity” relates to toxicity in the nervous system. It occurs when exposure to natural or artificial toxic substances (neurotoxins) alter the normal activity of the nervous system in such a way as to cause damage to nervous tissue. Examples of neurotoxicity include, but are not limited to, neurotoxicity resulting from exposure to substances used in chemotherapy, radiation treatment, drug therapies, drug abuse, and organ transplants, as well as exposure to heavy metals, certain foods and food additives, pesticides, industrial and/or cleaning solvents, cosmetics, and some naturally occurring substances.
The term “cancer” refers to a disease characterized by the presence of a neoplasm or tumor resulting from abnormal uncontrolled growth of cells (such cells being “cancer cells”). As used herein, the term cancer explicitly includes, but is not limited to, hepatocellular carcinoma, colon carcinogenesis and ovarian cancer.
The term “mammal” as used herein includes both humans and non-humans and includes but is not limited to humans, non-human primates, canines, felines, murines, bovines, equines, and porcines. In a particularly preferred embodiment, the term “mammal” refers to humans.
In a first aspect, the present invention provides compounds of Formula (I)
In one embodiment, there is provided a compound of formula (I) as described herein, wherein the compound of formula (I) is a compound of formula (Ia):
In one embodiment, there is provided a compound of formula (I) as described herein, wherein the compound of formula (I) is a compound of formula (Ib):
In one embodiment, there is provided a compound of formula (I) as described herein, wherein:
In one embodiment, the present invention provides compounds of formula (I) as described herein wherein:
In one embodiment, there is provided a compound of formula (I) as described herein, wherein:
In one embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a further preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a further preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a particularly preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In one embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a further preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a further preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a particularly preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In one embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a particularly preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a further particularly preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In yet a further particularly preferred embodiment, L is —CF2—.
In one embodiment, L is —CHR1— or a covalent bond, wherein R1 is as defined herein.
In one embodiment, R1 is selected from aryl, halogen, alkoxyalkyl, alkoxy, haloaryl, alkyl, and hydroxyalkyl.
In one embodiment, R1 is selected from phenyl, fluoro, 2-methoxyethyl, methoxy, methyl, 4-fluorophenyl and 2-hydroxyethyl.
In one embodiment, R2 is hydrogen or halogen.
In one embodiment, R2 is hydrogen or fluoro.
In one embodiment, R3 is alkyl. In one embodiment, R3 is methyl.
In one embodiment, R4 is hydrogen.
In one embodiment, p is 0 or 1.
In one embodiment, p is 0.
In one embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a particularly preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a further particularly preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In yet a further particularly preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In one embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a particularly preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
In a further particularly preferred embodiment, there is provided a compound of formula (I) as described herein, wherein:
The invention also provides the following enumerated Embodiments (E):
E1: A compound of formula (I)
E2: The compound of formula (I) according to E1, wherein the compound of formula (I) is a compound of formula (Ia):
E3: The compound of formula (I) according to E1, wherein the compound of formula (I) is a compound of formula (Ib):
E4: The compound of formula (I) according to any one of E1 to E3, wherein:
E5: The compound of formula (I) according to any one of E1 to E3, wherein:
E6: The compound of formula (I) according to any one of E1 to E3, wherein:
E7: The compound of formula (I) according to any one of E1 to E6, wherein:
E8: The compound of formula (I) according to any one of E1 to E6, wherein:
E9: The compound of formula (I) according to any one of E1 to E6, wherein:
E10: The compound of formula (I) according to anyone of E1 to E9, wherein m and n are both 2 and X is CH or N.
E11: The compound of formula (I) according to any one of E1 to E3, wherein:
E12: The compound of formula (I) according to any one of E1 to E3, wherein:
E13: The compound of formula (I) according to any one of E1 to E3, wherein:
R3 is methyl.
In one aspect, the present invention provides a compound of formula (Ic)
and R2 is selected from hydrogen, halogen, and hydroxy; or
and a group
In a preferred embodiment, the compound of formula (Ic) is a compound of formula (I) as defined hereinabove:
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein the compound of formula (Ic) is a compound of formula (Id):
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein the compound of formula (Ie)
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein the compound of formula (Ic) is a compound of formula (If):
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein the compound of formula (Ic) is a compound of formula (Ig):
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein:
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein p is 0 or 1.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein p is 0.
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein:
and R2 is selected from hydrogen, halogen, and hydroxy; or R1 and R2, taken together with the carbon atom to which they are attached, form a C3-12-cycloalkyl.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R1 is selected from halogen, C1-6-alkyl, hydroxy-C1-6-alkyl, C1-6-alkoxy-C1-6-alkyl-, halo-C1-6-alkoxy, and a group
and R2 is hydrogen or halogen.
In a particularly preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R1 is selected from 2-methoxyethyl, methyl, 2,2,2-trifluoroethoxy, fluoro, 2-hydroxyethyl, and a group
and R2 is hydrogen or fluoro.
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R3 is C1-6-alkyl or halo-C1-6-alkyl; and R4 is hydrogen.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R3 is C1-6-alkyl; and R4 is hydrogen.
In a particularly preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R3 is methyl; and R4 is hydrogen.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R20 is hydrogen.
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R21 is selected from hydrogen, halogen, hydroxy, C1-6-alkoxy, halo-C1-6-alkoxy, C1-6-alkyl, halo-C1-6-alkyl, hydroxy-C1-6-alkyl, (halo-C1-6-alkyl)-hydroxy-C1-6-alkyl, C1-6-alkoxycarbonyl-C1-6-alkyl-,C1-6-alkoxycarbonyl-NH—C1-6-alkoxy-,C1-6-alkoxycarbonyl-NH—(C1-6-alkoxy)2-C1-6-alkyl-C(O)—NH—C1-6-alkoxy-,C1-6-alkoxycarbonyl-NH—C1-6-alkoxy-C1-6-alkyl-C(O)—NH—C1-6-alkoxy-, SF5, (C1-6-alkyl)3Si—O—C1-6-alkyl-, a group
and a group
wherein R27, R28, C1, C2, L3 and L3a are as defined herein.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R21 is selected from halogen, C1-6-alkoxy, halo-C1-6-alkoxy, C1-6-alkyl, halo-C1-6-alkyl, SF5, C6-14-aryl, and a group
wherein R27, R28, C1 and L3 are as defined herein.
In a particularly preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R21 is selected from fluoro, chloro, bromo, methyl, methoxy, tert-butyl, propyl, trifluoromethoxy, 2-fluoroethoxy, 2,2,2-trifluoroethoxy, trifluoromethyl, 2,2,2-trifluoroethyl, 1,1-difluoroethyl, SF5, phenyl, and a group
wherein R27, R28, C1 and L3 are as defined herein.
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R22 is selected from hydrogen, halogen, C1-6-alkoxy, halo-C1-6-alkoxy, C1-6-alkyl, and cyano.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R22 is selected from hydrogen, halogen, C1-6-alkoxy and halo-C1-6-alkoxy.
In a particularly preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R22 is selected from hydrogen, fluoro, chloro, methoxy, methyl, and trifluoromethyl.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R23 is hydrogen or halogen.
In a particularly preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R23 is hydrogen or fluoro.
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R24 is hydrogen.
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R25 is selected from hydrogen, halogen, C1-6-alkyl, C1-6-alkoxy, halo-C1-6-alkyl, halo-C1-6-alkoxy, C1-6-alkyl-SO2—, and C3-12-cycloalkyl.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R25 is selected from hydrogen, halogen, C1-6-alkoxy, and C3-12-cycloalkyl.
In a particularly preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R25 is selected from hydrogen, methoxy, fluoro, and cyclopropyl.
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R26 is selected from hydrogen, C1-6-alkyl, and C1-6-alkoxy.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R26 is hydrogen or C1-6-alkoxy.
In a particularly preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R26 is hydrogen or methoxy.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R27 is selected from hydrogen, halo-C1-6-alkoxy, C1-6-alkyl, halo-C1-6-alkyl, and halogen.
In a particularly preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R27 is selected from methyl, trifluoromethoxy, trifluoromethyl, 2,2,2-trifluoro-1-methyl-ethoxy, 2,2,2-trifluoro-1,1-dimethyl-ethoxy, 2,2,2-trifluoroethoxy, fluoro, and chloro.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R28 is selected from hydrogen, C1-6-alkyl, and halogen.
In a particularly preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein R28 is selected from hydrogen, methyl, fluoro, and chloro.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein A is C6-14-aryl or C1-13-heteroaryl.
In a particularly preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein A is selected from phenyl, indol-3-yl, 2-pyridyl, and 3-pyridyl.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein B is C6-14-aryl or C1-13-heteroaryl.
In a particularly preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein B is phenyl or 1,2,4-oxadiazol-5-yl.
In one embodiment, the present invention provides a compound of formula (I) as described herein, or a pharmaceutically acceptable salt thereof, wherein C1 is selected from azetidin-1-yl, pyrrolidin-1-yl, cyclopropyl, and oxetan-3-yl.
In one embodiment, the present invention provides a compound of formula (I) as described herein, or a pharmaceutically acceptable salt thereof, wherein C2 is phenyl.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein L is selected from —CR1R2—(CH2)p—, —OCR3R4—, —CR3R4O— and a covalent bond; wherein R1 to R4 and p are as defined herein.
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein L2 is selected from a covalent bond, —O—, and —CH2—.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein L2 is a covalent bond.
In one embodiment, the present invention provides a compound of formula (I) as described herein, or a pharmaceutically acceptable salt thereof, wherein L3 is selected from a covalent bond, —CH2O—, and —CH2—.
In a preferred embodiment, the present invention provides a compound of formula (I) as described herein, or a pharmaceutically acceptable salt thereof, wherein L3 is a covalent bond or —CH2—.
In one embodiment, the present invention provides a compound of formula (I) as described herein, or a pharmaceutically acceptable salt thereof, wherein L3a is a covalent bond or —CH2—.
In a preferred embodiment, the present invention provides a compound of formula (I) as described herein, or a pharmaceutically acceptable salt thereof, wherein L3a is a covalent bond.
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein:
and R2 is selected from hydrogen, halogen, and hydroxy; or
and a group
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein:
In a particularly preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein:
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein:
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein:
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein:
and R2 is selected from hydrogen, halogen and hydroxy; or
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein:
In a particularly preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein:
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein:
and a group
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein:
In a particularly preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein:
In one embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, selected from the compounds presented in Table 1 and Table 3.
In a preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, selected from the compounds presented in Table 1.
In a particularly preferred embodiment, the present invention provides a compound of formula (Ic) as described herein, or a pharmaceutically acceptable salt thereof, wherein the compound of formula (Ic) is selected from:
In one embodiment, the present invention provides pharmaceutically acceptable salts or esters of the compounds of formula (I) as described herein. In a particular embodiment, the present invention provides pharmaceutically acceptable salts of the compounds according to formula (I) as described herein, especially hydrochloride salts. In a further particular embodiment, the present invention provides pharmaceutically acceptable esters of the compounds according to formula (I) as described herein. In yet a further particular embodiment, the present invention provides compounds according to formula (I) as described herein.
The preparation of compounds of formula (I) of the present invention may be carried out in sequential or convergent synthetic routes. Syntheses of the invention are shown in the following general schemes. The skills required for carrying out the reaction and purification of the resulting products are known to those persons skilled in the art. The substituents and indices used in the following description of the processes have the significance given herein, unless indicated to the contrary.
If one of the starting materials, intermediates or compounds of formula (I) contain one or more functional groups which are not stable or are reactive under the reaction conditions of one or more reaction steps, appropriate protective groups (as described e.g., in “Protective Groups in Organic Chemistry” by T. W. Greene and P. G. M. Wutts, 5th Ed., 2014, John Wiley & Sons, N.Y.) can be introduced before the critical step applying methods well known in the art. Such protective groups can be removed at a later stage of the synthesis using standard methods described in the literature.
If starting materials or intermediates contain stereogenic centers, compounds of formula (I) can be obtained as mixtures of diastereomers or enantiomers, which can be separated by methods well known in the art e.g., chiral HPLC, chiral SFC or chiral crystallization. Racemic compounds can e.g., be separated into their antipodes via diastereomeric salts by crystallization with optically pure acids or by separation of the antipodes by specific chromatographic methods using either a chiral adsorbent or a chiral eluent. It is equally possible to separate starting materials and intermediates containing stereogenic centers to afford diastereomerically/enantiomerically enriched starting materials and intermediates. Using such diastereomerically/enantiomerically enriched starting materials and intermediates in the synthesis of compounds of formula (I) will typically lead to the respective diastereomerically/enantiomerically enriched compounds of formula (I).
A person skilled in the art will acknowledge that in the synthesis of compounds of formula (I)—insofar not desired otherwise—an “orthogonal protection group strategy” will be applied, allowing the cleavage of several protective groups one at a time each without affecting other protective groups in the molecule. The principle of orthogonal protection is well known in the art and has also been described in literature (e.g. Barany and R. B. Merrifield, J. Am. Chem. Soc. 1977, 99, 7363; H. Waldmann et al., Angew. Chem. Int. Ed. Engl. 1996, 35, 2056).
A person skilled in the art will acknowledge that the sequence of reactions may be varied depending on reactivity and nature of the intermediates.
In more detail, the compounds of formula (I) can be manufactured by the methods given below, by the methods given in the examples or by analogous methods. Appropriate reaction conditions for the individual reaction steps are known to a person skilled in the art. Also, for reaction conditions described in literature affecting the described reactions see for example: Comprehensive Organic Transformations: A Guide to Functional Group Preparations, 2nd Edition, Richard C. Larock. John Wiley & Sons, New York, N.Y. 1999). It was found convenient to carry out the reactions in the presence or absence of a solvent. There is no particular restriction on the nature of the solvent to be employed, provided that it has no adverse effect on the reaction or the reagents involved and that it can dissolve the reagents, at least to some extent. The described reactions can take place over a wide range of temperatures, and the precise reaction temperature is not critical to the invention. It is convenient to carry out the described reactions in a temperature range between −78° C. to reflux. The time required for the reaction may also vary widely, depending on many factors, notably the reaction temperature and the nature of the reagents. However, a period of from 0.5 hours to several days will usually suffice to yield the described intermediates and compounds. The reaction sequence is not limited to the one displayed in the schemes, however, depending on the starting materials and their respective reactivity, the sequence of reaction steps can be freely altered.
If starting materials or intermediates are not commercially available or their synthesis not described in literature, they can be prepared in analogy to existing procedures for close analogues or as outlined in the experimental section.
The following abbreviations are used in the present text:
AcOH=acetic acid, ACN=acetonitrile, Boc=tert-butyloxycarbonyl, CAS RN=chemical abstracts registration number, Cbz=benzyloxycarbonyl, Cs2CO3=cesium carbonate, CO=carbon monoxide, CuCl=copper(I) chloride, CuCN=copper(I) cyanide, CuI=copper(I) iodide, DMAP=4-dimethylaminopyridine, DME=dimethoxyethane, DMEDA=N,N′-dimethylethylenediamine, DMF=N,N-dimethylformamide, DIPEA=N,N-diisopropylethylamine, dppf=1,1 bis(diphenyl phosphino)ferrocene, EDC.HCl=N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride, EI=electron impact, ESI=electrospray ionization, EtOAc=ethyl acetate, EtOH=ethanol, h=hour(s), FA=formic acid, H2O=water, H2SO4=sulfuric acid, Hal=halogen, HATU=1-[bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium-3-oxide hexafluorophosphate, HBTU=O-benzotriazole-N,N,N′,N′-tetramethyl-uronium-hexafluorophosphate, HCl=hydrogen chloride, HOBt=1-hydroxy-H-benzotriazole; HPLC=high performance liquid chromatography, iPrMgCl=isopropylmagnesium chloride, I2=iodine, IPA=2-propanol, (Ir[dF(CF3)ppy]2(dtbpy))PF6=[4,4′-bis(1,1-dimethylethyl)-2,2′-bipyridine-N1,N1′]bis[3,5-difluoro-2-[5-(trifluoromethyl)-2-pyridinyl-N]phenyl-C]Iridium(III) hexafluorophosphate, ISP=ion spray positive (mode), ISN=ion spray negative (mode), K2CO3=potassium carbonate, KHCO3=potassium bicarbonate, KI=potassium iodide, KOH=potassium hydroxide, K3PO4=potassium phosphate tribasic, LiAlH4 or LAH=lithium aluminium hydride, LiHMDS=lithium bis(trimethylsilyl)amide, LiOH=lithium hydroxide, MgSO4=magnesium sulfate, min=minute(s), mL=milliliter, MPLC=medium pressure liquid chromatography, MS=mass spectrum, NaH=sodium hydride, NaHCO3=sodium hydrogen carbonate, NaNO2=sodium nitrite, NaOH=sodium hydroxide, Na2CO3=sodium carbonate, Na2SO4=sodium sulfate, Na2S2O3=sodium thiosulfate, NBS=N-bromosuccinimide, nBuLi=n-butyllithium, NEt3=triethylamine (TEA), NH4Cl=ammonium chloride, NiCl2 glyme=Nickel(II) chloride ethylene glycol dimethyl ether complex, NMP=N-methyl-2-pyrrolidone, OAc=Acetoxy, T3P=propylphosphonic anhydride, P2O5=phosphorus pentoxide, PE=petroleum ether, PG=protective group, Pd—C=palladium on activated carbon, PdCl2(dppf)-CH2Cl2=1,1′-bis(diphenylphosphino)ferrocene-palladium(II)dichloride dichloromethane complex, Pd2(dba)3=tris(dibenzylideneacetone)dipalladium(0), Pd(OAc)2=palladium(II) acetate, Pd(OH)2=palladium hydroxide, Pd(PPh3)4=tetrakis(triphenylphosphine)palladium(0), PTSA=p-toluenesulfonic acid, R=any group, RT=room temperature, SFC=Supercritical Fluid Chromatography, S-PHOS=2-dicyclohexylphosphino-2′,6′-dimethoxybiphenyl, T3P=propylphosphonic anhydride, TBAI=tetra butyl ammonium iodine, TEA=triethylamine, TFA=trifluroacetic acid, THF=tetrahydrofuran, TMEDA=N,N,N′,N′-tetramethylethylenediamine, ZnCl2=zinc chloride, Xantphos=4,5-Bis(diphenylphosphino)-9,9-dimethylxanthene.
Compounds of formula I wherein A, L, X, n and m are as described herein can be synthesized in analogy to literature procedures and/or as depicted for example in Scheme 1.
Accordingly, 4a,5,6,7,8,8a-Hexahydro-4H-pyrido[4,3-b][1,4]oxazin-3-ones 1 are reacted with intermediates 2 in the presence of a urea forming reagent such as bis(trichloromethyl) carbonate using a suitable base and solvent such as, e.g. sodium bicarbonate in DCM, to give compounds of formula I (step a). Further urea forming reagents include but are not limited to phosgene, trichloromethyl chloroformate, (4-nitrophenyl)carbonate or 1,1′-carbonyldiimidazole. Reactions of this type and the use of these reagents are widely described in literature (e.g. G. Sartori et al., Green Chemistry 2000, 2, 140). A person skilled in the art will acknowledge that the order of the addition of the reagents can be important in this type of reactions due to the reactivity and stability of the intermediary formed carbamoyl chlorides, as well as for avoiding formation of undesired symmetrical urea by-products.
The compounds of formula (Ic) described herein may be prepared in analogy to the compounds of formula (I), as described herein in Schemes 1 to 18. For example, in analogy to the procedure described in Scheme 1 above, 4a,5,6,7,8,8a-Hexahydro-4H-pyrido[4,3-b][1,4]oxazin-3-ones 1 are reacted with intermediates 2a to yield compounds of formula (Ic) (Scheme 1A, step a).
Intermediates 1 may be synthesized as depicted for example in Scheme 2 and/or in analogy to methods described in literature.
Thus, 3-aminopiperidin-4-ol derivatives 3 in which “PG” signifies a suitable protective group such as a Cbz or Boc protective group can be acylated for example with chloro- or bromoacetyl chloride 4, in which “LG” signifies a suitable leaving group (e.g., Cl or Br), using a suitable base such as sodium or potassium carbonate, sodium hydroxide or sodium acetate in an appropriate solvent such as THF, water, acetone or mixtures thereof, to provide intermediates 5 (step a).
Intermediates 5 can be cyclized to intermediates 6 using methods well known in the art, for example by treatment of 5 with sodium hydride in THF or potassium tert-butoxide in IPA and water (step b). Reactions of that type are described in literature (e.g. Z. Rafinski et al., J. Org. Chem. 2015, 80, 7468; S. Dugar et al., Synthesis 2015, 47(5),712; WO2005/066187).
Removal of the protective group in intermediates 6, applying methods known in the art (e.g., a Boc group using TFA in DCM at temperatures between 0° C. and room temperature, a Cbz group using hydrogen in the presence of a suitable catalyst such as Pd or Pd(OH)2 on charcoal in a suitable solvent such as MeOH, EtOH, EtOAc or mixtures therefore and as described for example in “Protective Groups in Organic Chemistry” by T. W. Greene and P. G. M. Wuts, 4th Ed., 2006, Wiley N.Y.), furnishes intermediates 1 (step c).
Intermediates 1 can be obtained as mixtures of diastereomers and enantiomers, respectively, or as single stereoisomers depending on whether racemic mixtures or enantiomerically pure forms of cis- or trans-3-aminopiperidin-4-ol derivatives 3 are employed in their syntheses. Intermediates 3 are commercially available and their synthesis has also been described in literature (e.g. WO2005/066187; WO2011/0059118; WO2016/185279).
Optically pure cis-configured intermediates 1B and 1C can be obtained for example according to Scheme 3 by chiral separation of commercially available (cis-rac)-4a,5,6,7,8,8a-hexahydro-4H-pyrido[4,3-b][1,4]oxazin-3-one (1A) (optionally in form of a salt such as, e.g. a hydrochloride salt) using methods known in the art, e.g. by diastereomeric salt crystallization or by chiral chromatography (step a).
In some embodiment, intermediates 2 are intermediates of type B, C, D or E. Intermediates of type B, C, D or E can be prepared for example by the synthetic procedures outlined in Schemes 4, 5, 6 and 7.
Intermediates of type B in which R1 is as defined herein, can be prepared by a variety of conditions, which may be exemplified by the general synthetic procedure outlined in Scheme 4.
Starting from aryl or heteroaryl halides 7, wherein X1 is selected from Cl, Br or I and A is as defined herein, a lithium halogen exchange reaction can be performed using a solution of LiHMDS or n-BuLi, preferably n-BuLi in a solvent like THF, diethyl ether, n-pentane, n-hexane or mixtures thereof, preferably THF and in a temperature range between −20° C. and −78° C., preferably at −78° C., to generate the corresponding lithiated aryl or heteroaryl intermediate. Nucleophilic addition of the in situ prepared lithiated aryl or heteroaryl intermediate to ketones of type 8, wherein R1, m and n are as defined herein, in a solvent such as THF and preferably at a temperature of −78° C. gives the corresponding tertiary alcohols 9 (step a).
Subsequent elimination of the tertiary hydroxy group with concomitant removal of the Boc protective group using acidic conditions such as 4M HCl in dioxane in a solvent like MeOH, or, preferably, TFA in DCM yields the corresponding olefins 10 (step b).
Heterogeneous catalytic hydrogenation of olefins 10 using a catalyst such as Pd(OH)2 or Pd/C in a solvent like THF, MeOH, EtOH, EtOAc or a mixture thereof, preferably Pd/C in THF under e.g., atmospheric pressure of hydrogen, affords intermediates of type B (step c).
Intermediates 8 are commercially available and/or can be prepared in analogy to methods described in literature, e.g. Bioorg. Med. Chem. Lett. 2011, 21(18), 5191, WO2012/155199, WO2016/180536, Bioorg. Med. Chem. Lett. 2008, 18(18), 5087, WO2007/117557, J. Am. Chem. Soc. 2017, 139(33), 11353, J. Med. Chem. 2017, 60(13), 5507.
Intermediates of type C, wherein A is as defined herein and n=1, 2 or 3 can be prepared by a variety of conditions, which may be exemplified by the general synthetic procedures outlined in Scheme 5.
Treatment of a mixture of aryl or heteroaryl compounds 11, wherein A is as defined herein, preferably wherein A is substituted heteroaryl as defined herein, most preferably substituted indolyl as defined herein, and ketones 12, wherein n is as defined herein, with a base such as NaOH or KOH in a solvent like EtOH or MeOH and in a temperature range between room temperature and 80° C., preferably around the reflux temperature of the mixture, gives olefins 13 (step a).
Subsequent heterogeneous catalytic hydrogenation using a transition metal catalyst, such as PtO2 in a polar solvent like MeOH, EtOH, AcOEt, AcOH or a mixture thereof, preferably a mixture of EtOH/AcOH at around room temperature from low to high pressure, preferably around 5 bar pressure of hydrogen gas, yields intermediates 14 (step b).
Removal of the Boc protective group using acidic conditions such as treatment with TFA in DCM or preferably with 4M HCl in dioxane in a solvent like MeOH gives the corresponding intermediates of type C (step c).
In some embodiments, intermediate 14 is an intermediate of formula 14a, wherein ring A is heteroaryl comprising a secondary amino group (i.e., “—NH—”, such as in indolyl) and m and n are as defined herein. Intermediates 14a may be transformed to intermediates of type D, wherein A is heteroaryl comprising at least one nitrogen atom, m and n are as defined herein and R14 is selected from alkyl, cycloalkyl, hydroxyalkyl, cycloalkylalkyl, heterocyclyl and heterocyclylalkyl, preferably from methyl, cyclopropyl, cyclopropylmethyl, hydroxyethyl, oxetan-3-yl and oxetan-3-ylmethyl, for example as outlined in Scheme 6.
Thus, intermediates 14a can be N-functionalized by treatment with an appropriate base, such as NaH, KH, NaHMDS, LiHMDS, LDA, preferably with NaH in a suitable solvent like DMF, THF, dioxane, or a mixture thereof, preferably DMF and in a temperature range between −78° C. and room temperature, preferably at 0° C., followed by addition of compounds R14-LG in which LG signifies an appropriate leaving group such as chlorine, bromine, iodine, OSO2alkyl (e.g. mesylate (methanesulfonate), OSO2fluoroalkyl (e.g. triflate (trifluoromethanesulfonate) or OSO2aryl (e.g. tosylate (p-toluenesulfonate)) to give the corresponding N-functionalized compounds 15, wherein R14 is as defined above for intermediate D. A person skilled in the art will acknowledge that depending on the nature of R14 additional or different reagents may be applied such as using cyclopropylboronic acid in the presence of copper(II)acetate and a base such as DMAP with NaHMDS in a solvent such as toluene at temperatures up to the boiling point of the solvent in case R14 signifies a cyclopropyl group (step a).
Deprotection of compounds 15 using the same conditions as described above for compounds 14 (see Scheme 5, step c) affords intermediates of type D (step b).
In one embodiment, intermediate D is an indazole derivative of type E, wherein m, n, and R14 are as defined herein. In addition to the procedure outlined in Scheme 6, intermediates of type E can be prepared by a variety of conditions, in particular by the general synthetic procedure outlined in Scheme 7.
Accordingly, condensation of intermediates 16, wherein PG is a protective group such as Boc, Cbz or Bn and m and n are as described herein, with a hydrazine derivative of type R14NHNH2 in which R14 is as described as herein in a solvent like n-BuOH, DMA, DMF, DMSO, or a mixture thereof, preferably in n-BuOH, in a sealed reaction vessel at elevated temperature, e.g. 120° C., yields indazole compounds 17 (step a).
Subsequent, removal of the protective group, in case of a Boc group using for example acidic conditions, such as treatment with HCl in dioxane or TFA in DCM, preferably with 4M HCl in dioxane in a solvent like MeOH, preferably at around room temperature affords intermediates of type E (step b).
In some embodiments, intermediates 2 are intermediates of type F, G, H, J, K, L and M. Intermediates of type F, G, H, J, K, L and M in which A, m and n are as described herein, R15 and R16 are each independently selected from alkyl, cycloalkyl, hydroxyalkyl, cycloalkylalkyl, heterocyclyl and heterocyclylalkyl, preferably from methyl, cyclopropyl, cyclopropylmethyl, hydroxyethyl, oxetan-3-yl and oxetan-3-ylmethyl; and R17 is selected from substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl and substituted or unsubstituted alkyl, can be prepared by methods well known by a person skilled in the art and as exemplified by the general synthetic procedures outlined in Scheme 8.
The carbonyl group in intermediates 18, wherein A, m and n are as described herein and PG is a suitable protective group such as a Boc, Cbz or Bn group, either commercially available or prepared according to methods described in literature (e.g. J. Am. Chem. Soc. 2017, 139(33), 11353, J. Med. Chem. 2017, 60(13), 5507, RSC Advances 2015, 5(61), 40964), can be reduced by methods well known in the art, e.g. using NaBH4 in MeOH, to give intermediates 19 (step a).
Removal of the protective group from intermediates 19 applying methods known in the art (e.g., a Boc group using TFA in DCM or 4M HCl in dioxane at temperatures between 0° C. and room temperature, a Cbz group using hydrogen in the presence of a suitable catalyst such as Pd or Pd(OH)2 on charcoal in a suitable solvent such as MeOH, EtOH, EtOAc or mixtures therefore and as described for example in “Protective Groups in Organic Chemistry” by T. W. Greene and P. G. M. Wuts, 4th Ed., 2006, Wiley N.Y.), furnishes intermediates G (step b).
Alkylation of the hydroxy group of intermediates 19 with an alkylating agent of type R15LG in which LG is a suitable leaving group such as chlorine, bromine, iodine, OSO2alkyl (e.g. mesylate (methanesulfonate), OSO2fluoroalkyl (e.g. triflate (trifluoromethanesulfonate) or OSO2aryl (e.g. tosylate (p-toluenesulfonate)) and R15 is as described herein, using a suitable base in an appropriate solvent (e.g. sodium hydride in DMF) at temperatures between 0° C. and the boiling temperature of the solvent gives intermediates 20 (step c).
Removal of the protective group from intermediates 20 applying methods well known in the art and as described above (step b) yields intermediates F (step d).
Intermediates 18 can be converted into intermediates 21 in which Ra is alkyl, preferably methyl or ethyl by using an olefination reaction such as the widely described Wittig or Homer Emmons reaction, e.g. using ethyl 2-(diethoxyphosphoryl)acetate and LiHMDS in dioxane at temperatures ranging from 0° C. to the boiling point of the solvent (step e).
The double bond in intermediates 21 can be reduced for example by hydrogenation in the presence of a suitable catalyst such as Pd—C in a suitable solvent such as MeOH, EtOH or EtOAc or mixtures thereof to yield intermediates 22 (step f).
Reduction of the ester functionality in intermediates 22 using for example LiBH4 in THF at temperatures ranging from 0° C. to the boiling point of the solvent provides intermediates 23 (step g).
Removal of the protective group from intermediates 23 applying methods well known in the art and as described above (step b) yields intermediates G (step h).
Alkylation of the hydroxy group of intermediates 23 with an alkylating agent of type R16LG in which LG is a suitable leaving group and R16 as described herein, using conditions as described above (step c), gives intermediates 24 (step i).
Removal of the protective group from intermediates 24 applying methods well known in the art and as described above (step b) yields intermediates H (step i).
Addition of an organometallic compound of type R17M in which M is for example MgCl, MgCl or Li and R17 as described herein to intermediates 18 provides intermediates 25 (step k). Reactions of this type are well known in the art and described in literature (J. Med. Chem. 1989, 32(1), 105, J. Med. Chem. 2014, 57(4), 1543, Bioorg. Med. Chem Lett. 2015, 25(13), 2720).
Removal of the protective group from intermediates 25 applying methods well known in the art and as described above (step b) furnishes intermediates J (step 1).
Alkylation of the hydroxy group of intermediates 25 with an alkylating agent of type R15LG in which LG is a suitable leaving group and R15 as described herein, using conditions as described above (step c), gives intermediates 26 (step m).
Removal of the protective group from intermediates 26 applying methods well known in the art and as described above (step b) furnishes intermediates K (step n).
Intermediates 18 can be converted into intermediates 27 applying methods known in the art and described in literature (e.g. J. Med. Chem. 2003, 46(25), 5445; WO2016/205590), for example by Wittig olefination using, e.g. methyl triphenylphosphonium bromide and potassium tert-butoxide in toluene or LiHMDS in THF (step o).
Reduction of the double bond of intermediates 27 applying for example hydrogenation conditions (e.g. hydrogen in the presence of a suitable catalyst such as Pd—C or PtO2) or using 9-borabicyclo(3.3.1)nonan in THF (in analogy to literature methods, e.g. WO2007/002057) gives intermediates 28 (step p).
Removal of the protective group from intermediates 28 applying methods well known in the art and as described above (step b) furnishes intermediates L (step q).
Conversion of the ketone of intermediates 18 applying for example fluorination conditions using aminosulfurans such as DAST, gives intermediates 29 (step r).
Removal of the protective group from intermediates 29 applying methods well known in the art and as described above (step b) furnishes intermediates M (step s).
In some embodiment, intermediates 2 are intermediates of type N and O in which A, m, n and R15 are as described herein can be prepared by methods well known by a person skilled in the art and as exemplified by the general synthetic procedures outlined in Scheme 9.
Accordingly, intermediates 30a in which A, m and are as defined herein, PG signifies a suitable protective group such as a Boc, Cbz or Bn and Y is a formyl group (commercially available or prepared by literature methods, e.g. Bioorg. Med. Chem. Lett. 2006, 16(14), 3668; WO2013/179024) can be treated with a reducing agent such as NaBH4 in MeOH to yield intermediates 31. Reactions of this type are also described in literature (e.g. WO2013/179024) (step a).
Alternatively, intermediates 31 can be prepared from intermediates 30b in which Y is a carboxyl group (commercially available or prepared in analogy to methods described in literature, e.g. Bioorg. Med. Chem. 2013, 21(15), 4600; WO2016/109501) by using an appropriate reducing agent such as borane tetrahydrofuran complex in a solvent such as THF. Reactions of this type are also widely described in literature, e.g. Bioorg. Med. Chem. 2013, 21(15), 4600) (step a).
Removal of the protective group from intermediates 31 applying methods well known in the art and as described above furnishes intermediates N (step b).
Alkylation of the hydroxy group of intermediates 31 with an alkylating agent of type R15LG in which LG is a suitable leaving group and R15 as described herein, using conditions as described above, gives intermediates 32 (step c).
Removal of the protective group from intermediates 32 applying methods well known in the art and as described under Scheme 8, step b, furnishes intermediates O (step d).
In another embodiment, intermediates 2 are intermediates of type P, in which A is as defined herein, m is 1 or 2, Ar signifies an aryl group and HET signifies an heterocyclyl or heteroaryl group. Intermediates of that type can be prepared in analogy to literature methods (e.g. Bioorg. Med. Chem. 2013, 21(7), 1756) or as exemplified by the synthetic procedure outlined in Scheme 10.
The carbonyl group in intermediates 33, wherein Ar is aryl and HET is heteroaryl or heterocyclyl can be reduced by methods well known in the art, e.g. using NaBH4 in MeOH, to give intermediates 34 (step a).
The hydroxyl group of intermediates 34 can be converted into a suitable leaving group such as chlorine, bromine, OSO2alkyl (e.g. mesylate (methanesulfonate), OSO2fluoroalkyl (e.g. triflate (trifluoromethanesulfonate) or OSO2aryl (e.g. tosylate (p-toluenesulfonate)), e.g. a chlorine group by reaction with thionyl chloride in toluene, to give intermediates 34 (step b).
Intermediates 35 can be reacted with commercially available monoprotected piperazines (m=1) or homopiperazines (m=2) 36, wherein PG is a protective group, such as Boc, Cbz or Bn, optionally in the presence of KI, using a suitable base and solvent such as TEA or Huenig's base in AcCN to yield intermediates 37 (step c).
Removal of the protective group from intermediates 37 applying methods well known in the art and as described above furnishes intermediates P (step d).
In another embodiment, intermediates 2 are intermediates of type Q in which A is as defined herein, m is 1 or 2, Ar signifies an aryl group and HET signifies a heteroaryl group. Intermediates of that type can be prepared in analogy to literature methods (e.g. Bioorg. Med. Chem. Lett. 2006, 16(16), 4349; Bioorg. Med. Chem. Lett. 2010, 20(12), 3788) and as exemplified by the synthetic procedure outlined in Scheme 11.
Condensation of aryl or heteroaryl aldehydes 38 with monoprotected piperazines (m=1) or homopiperazines (m=2) 36 in which PG is a suitable protective group such as a Boc group and benzotriazole for example in refluxing toluene under azeotropic removal of H2O gives intermediates 39 (step a).
Intermediates 39 are reacted in situ with benzylic Grignard or zinc reagents 40 of the type Ar/HETCH2MX with MX being a group such as MgCl, MgBr, ZnCl or ZnBr to afford intermediates 41 (step b).
Removal of the protective group from intermediates 41 applying methods well known in the art and as described above furnishes intermediates Q (step c).
In another embodiment, intermediates 2 in which X=N are intermediates of type R and S wherein m and R14 are as defined herein and R18 and R19 are each independently selected from hydrogen, substituted or unsubstituted alkyl, cyano, alkoxy and halogen, wherein substituted alkyl is as defined herein. Intermediates of that type can be prepared in analogy to literature methods (e.g. WO2007/098418) and as exemplified by the synthetic procedure outlined in Scheme 12.
Indole intermediates 42 can be reacted with monoprotected piperazines (m=1) or homopiperazines (m=2) 36 in which PG is a suitable protective group such as a Boc, Cbz or Bn group and LG is an appropriate leaving group such as —OAc or iodine, to yield intermediates 43 (step a). Reactions of this type are described in literature (e.g. WO2007/098418).
Concomitant or sequential removal of the protective groups from intermediates 43 applying methods well known in the art and as described above furnishes intermediates R (step b).
Selective removal of the indole protective group from intermediates 43 by methods well-known in the art gives intermediates 44 (step c). Intermediates 44 can be converted into intermediates 45 using compounds of the type R14LG by methods know in the art and as described under Scheme 6, step a (step d). Removal of the protective group from intermediates 45 applying methods well known in the art and as described above furnishes intermediates S (step e).
In another embodiment, intermediates 2 are intermediates of type T, in which A is as defined herein, m is 1 or 2 and R1 is selected from substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted aryl and substituted or unsubstituted heteroaryl. Intermediates of that type can be prepared in analogy to literature methods (e.g. Tetrahedron Letters 1990, 31(39), 5547) or as exemplified by the synthetic procedure outlined in Scheme 13.
The carbonyl group in intermediates 46 be reacted by reductive amination with an amine 36 by methods well known in the art, for example catalyzed by an acid, such as TiCl4, leading to the imine, which is then directly reduced in situ to the corresponding amine intermediate 47 with a reducing agent such as sodium cyanoborohydride (step a).
Removal of the protective group from intermediates 47 applying methods well known in the art and as described before furnishes intermediates T (step b).
In another embodiment, intermediates 2 are intermediates of type U, in which A is an aryl-substituted pyrazole and m is as described herein. Intermediates of that type can be prepared in analogy to literature methods (e.g. J. Med. Chem. 2018, 61(7), 3008) or as exemplified by the synthetic procedure outlined in Scheme 14.
The ketone in intermediates 48 is reacted with N,N-dimethylformamide dimethyl acetal and hydrazine dihydrochloride to yield the pyrazole intermediate 49 (step a).
An aryl-boronic acid is then reacted, using the reagents copper(II)acetate and pyridine to facilitate the reaction, to form intermediate 50 (step b). Removal of the protective group from intermediates 50 applying methods well known in the art and as described above furnishes intermediates U (step c).
In some embodiments, intermediates 2 are intermediates of type V in which m, n are as described herein, A is an optionally further substituted aryl or heteroaryl ring and R21 to R23 are each independently selected from hydrogen, substituted or unsubstituted (cyclo)alkyl, (cyclo)alkoxy, substituted or unsubstituted aryl, RbRcN, cyano, heterocycle, methylsulfonyl and halogen, wherein substituted alkyl, aryl and heteroaryl is as defined herein. Intermediates of that type can be prepared by methods well known in the art and as exemplified by the general synthetic procedures outlined in Scheme 15.
Commercially available intermediates 51 in which PG signifies a suitable protecting group and X is bromide or iodide can be subjected to cross-coupling reactions such as Negishi, Heck, Stille, Suzuki, Sonogashira or Buchwald-Hartwig coupling reactions with compounds 52, either commercially available or prepared by methods known in the art, in which FG signifies a suitable functional group such as, e.g. chloro, bromo, iodo, —OSO2alkyl (e.g. mesylate (methanesulfonate), —OSO2fluoroalkyl (e.g. triflate (trifluoromethanesulfonate) or —OSO2aryl (e.g. tosylate (p-toluenesulfonate) (step a). Reactions of this type are broadly described in literature and well known to persons skilled in the art.
For example, intermediates 51 can be reacted with aryl or heteroaryl boronic acids 52a (FG=B(OH)2) or boronic esters 52b (FG=e.g. 4,4,5,5-tetramethyl-2-phenyl-1,3,2-dioxaborolane (pinacol) ester) either commercially available or prepared using literature procedures as described for example in “Boronic Acids—Preparation and Applications in Organic Synthesis and Medicine” by Dennis G. Hall (ed.) 1st Ed., 2005, John Wiley & Sons, New York) using a suitable catalyst (e.g. dichloro[1,1′-bis(diphenylphosphino)-ferrocene]palladium(II) dichloromethane adduct, tetrakis(triphenylphosphine)palladium(0) or palladium(II)acetate with triphenylphosphine) in an appropriate solvent (e.g. dioxane, dimethoxyethane, water, toluene, DMF or mixtures thereof) and a suitable base (e.g. Na2CO3, NaHCO3, KF, K2CO3 or TEA) at temperatures between room temperature and the boiling point of the solvent or solvent mixture, to yield intermediates 53 (step a). Suzuki reactions of this type are broadly described in literature (e.g. A. Suzuki, Pure Appl. Chem. 1991, 63, 419-422; A. Suzuki, N. Miyaura, Chem. Rev. 1995, 95, 2457-2483; A. Suzuki, J. Organomet. Chem. 1999, 576, 147-168; V. Polshettiwar et al., Chem. Sus. Chem. 2010, 3, 502-522) and are well known to those skilled in the art. Alternatively, aryl- or heteroaryl-trifluoroborates 52c (FG=BF3) can be used in the cross-coupling reaction applying a palladium catalyst such as, e.g. tetrakis(triphenylphosphine)-palladium(0), palladium(II) acetate or dichloro[1,1′-bis(diphenylphosphino)ferrocene]-palladium(II) dichloromethane adduct in the presence of a suitable base such as cesium carbonate or potassium phosphate in solvents such as toluene, THF, dioxane, water or mixtures thereof, at temperatures between room temperature and the boiling point of the solvent or solvent mixture.
Alternatively, intermediates 51 can be reacted with aryl or heteroaryl stannanes 52d in which FG is Sn(alkyl)3 and alkyl is preferable n-butyl or methyl, using a suitable catalyst and solvent such as, e.g. tetrakis(triphenylphosphine)-palladium(0) in DMF at temperatures between room temperature and the boiling point of the solvent or solvent mixture to provide intermediates 53 (step a). Stille reactions of that type are well known in the art and described in literature, e.g. Org. React. 1997, 50, 1-652, ACS Catal. 2015, 5, 3040-3053.
Furthermore, intermediates 51 can be reacted with aryl or heteroarylzinc halides 52e in which FG is ZnHal and Hal preferably bromide or iodide, either commercially available or prepared by literature methods, using an appropriate catalyst and solvent system such as, e.g. [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) and copper(I)iodide in DMA, or tetrakis(triphenylphosphine)palladium(0) in THF or DMF at temperatures between room temperature and the boiling point of the solvent to provide intermediates 53. (step a). Negishi reactions of that type are well known in the art and also described in literature, e.g. Org. Lett., 2005, 7, 4871, ACS Catal. 2016, 6 (3), 1540-1552. Acc. Chem. Res. 1982, 15 (11), pp 340-348. Alternatively, intermediates 53 may be prepared by converting intermediates 51 in which X is for example iodide into the corresponding zinc species by applying literature methods (e.g. reaction of 51 with Zn powder in the presence of chlorotrimethylsilane and 1,2-dibromoethane in a suitable solvent such as DMA) and coupling of the zinc species with aryl- or heteroarylbromides- or iodides under the conditions mentioned before.
Alternatively, intermediates 51 in which X is preferably bromide can be subjected to a cross-electrophile coupling with aryl- or heteroarylbromides 52f in which FG signifies bromide under irradiation with a 420 nm blue light lamp using an appropriate photo catalyst such as [Ir{dF(CF3)ppy}2(dtbpy)]PF6 ([4,4′-bis(1,1-dimethylethyl)-2,2′-bipyridine-N1,N1′]bis[3,5-difluoro-2-[5-(trifluoromethyl)-2-pyridinyl-N]phenyl-C]Iridium(III) hexafluorophosphate), a Nickel catalyst like NiCl2 glyme (dichloro(dimethoxyethane)nickel), 4,4′-di-tert-butyl-2,2′-dipyridyl and tris(trimethylsilyl)silane, in the presence of a suitable base such as anhydrous sodium carbonate in a solvent like DME. Reactions of this type are described in literature, e.g. J. Am. Chem. Soc. 2016, 138, 8084. (step a).
Removal of the protective group from intermediates 53 applying methods well known in the art and as described for example under Scheme 2, step c, furnishes intermediates V (step b).
Intermediates 53 may alternatively be prepared from intermediates 51 and aryl or heteroaryl bromides 54, either commercially available or prepared by methods known in the art, applying the transformations described before under step a to furnish intermediates 55 (step c).
Intermediates 55 can be further reacted with compounds 56 applying the same synthetic strategies as described before under step a to provide intermediates 53 (step d).
Intermediates 53 in which R23 signifies an amine group of type RbRcN in which Rb is hydrogen, alkyl or aryl and Rc is alkyl or aryl or in which Rb and Rc, taken together with the nitrogen atom to which they are attached, form an optionally further substituted 4-11-membered, mono- or bicyclic heterocyclic ring, can be synthesized for example from reaction of 55 with primary or secondary amines RbRcNH and using for example a suitable catalyst (e.g. Pd(OAc)2, Pd2(dba)3), ligand (e.g. BINAP, Xphos, BrettPhos, RuPhos), base (e.g. Cs2CO3, K2CO3, KOt-Bu, LiHMDS, K3PO4) and solvent (e.g. toluene, THF, dioxane). Buchwald-Hartwig reactions of that type are known in the art and described in literature (e.g. Angew. Chem. Int. Ed. 2008, 47, 6338; Chem. Rev. 2008, 108, 3054, J. Organomet. Chem. 2018, 861, 17) (step d).
In some embodiment, compounds for Formula (I) are compounds Id and Ie in which m and n are as described herein, R21 and R22 are each independently selected from hydrogen, substituted or unsubstituted (cyclo)alkyl, haloalkyl, (cyclo)alkoxy, substituted or unsubstituted aryl, RbRcN, cyano, heterocycle, methylsulfonyl and halogen, X is Hal, A is optionally substituted aryl or optionally substituted heteroaryl, C is optionally substituted aryl or a 4-7-membered heterocyle containing at least one nitrogen atom to which it is linked to ring A. Intermediates of that type can be prepared by methods well known in the art and as exemplified by the general synthetic procedures outlined in Scheme 16.
The protective group of intermediates 55 can be removed applying methods well known in the art and as described for example under Scheme 2, step c, to give intermediates 57 (step a).
Intermediates 50 can be coupled with intermediates 1 under the conditions described under Scheme 1, step a, to provide compounds d (step b).
The bromo or iodo substituent in compounds Id can be converted into a boronic acid or boronic ester (e.g. pinacol ester) according to methods described in literature or as outlined under Scheme 15, step a, to yield intermediates 58 (step c).
Intermediates 58 can be reacted with compounds 59, either commercially available or prepared by literature methods and in which FG is an appropriate functional group such as chloride, bromide, OSO2alkyl (e.g. mesylate (methanesulfonate), —OSO2fluoroalkyl (e.g. triflate (trifluoromethanesulfonate) or —OSO2aryl (e.g. tosylate (p-toluenesulfonate) in a Suzuki coupling using for example the reaction conditions described under Scheme 15, step a, to provide compounds 1e (step d).
Compounds 1e in which ring C is a 4-7-membered heterocyle linked via its nitrogen to ring A can be prepared for example by Buchwald-Hartwig coupling reaction of compounds 1d with compounds 60 applying for example the conditions described under Scheme 15, step d (step e).
In some embodiment, intermediates 2 are intermediates of type W, X and Y in which m, n are as described herein, L is a covalent bond and A is a 5-membered heteroaryl ring further substituted by an optionally further substituted aryl ring. Compounds of that type can be prepared by methods well known in the art or by the methods exemplified in Schemes 17, 18 and 19 below.
Intermediates of type W, wherein each Y is independently CH or a heteroatom, e.g. a heteroatom selected from N, O and S, can be prepared by a variety of conditions, which may be exemplified by the general synthetic procedure outlined in Scheme 17. For example, if the 5-membered heteroaryl ring in compounds 62 is a bromo-substituted 1H-pyrrole, 1H-imidazole, 1H-pyrazole or 1H-triazole, it can be subjected to a Suzuki coupling reaction with optionally substituted phenyl-boronic acids 61a (B(ORa)2=B(OH)2) or boronic esters 61b (e.g. B(ORa)2=4,4,5,5-tetramethyl-2-phenyl-1,3,2-dioxaborolane (pinacol) ester)) in which R27 and R28 are each independently selected from hydrogen, substituted or unsubstituted (cyclo)alkyl, haloalkyl, (cyclo)alkoxy, substituted or unsubstituted aryl, RbRcN, cyano, substituted or unsubstituted heteroaryl, heterocycle, methylsulfonyl and halogen applying methods known in the art and as described under Scheme 15, s a, to provide intermediates 63 (step a).
Intermediates 63 can be reacted with compounds 64, either commercially available or prepared in analogy to literature methods, for example applying photoredox conditions as described under Scheme 15, step a, to give intermediates 65 (step b).
Removal of the protective group from intermediates 65 applying methods well known in the art and as described for example under Scheme 2, step c, furnishes intermediates W (step c).
Intermediates of type X in which the 5-membered heteroaryl ring is an 1,2,4-oxadiazole further substituted at position-3 with an optionally further substituted phenyl ring can be prepared for example by the general synthetic procedure outlined in Scheme 18.
Benzonitriles 66, commercially available or synthesized by methods known in the art, can be reacted with hydroxylamine, for example using hydroxylamine hydrochloride, and K2CO3 in EtOH at temperatures ranging from RT to the boiling point of the solvent to provide the amidoximes 67 (step a).
Coupling of intermediates 67 with activated carboxylic acids 68a (X=H) or carboxylic acid chlorides 68b (X=Cl), in which PG signifies a suitable protecting group, with subsequent cyclodehydration provides intermediates 69 (step b). Amide couplings of this type are widely described in the literature and can be accomplished by the usage of coupling reagents such as CDI, DCC, HATU, HBTU, HOBT, TBTU, T3P or Mukaiyama reagent (Mukaiyama T. Angew. Chem., Int. Ed. Engl. 1979, 18, 707) in a suitable solvent e.g., DMF, DMA, DCM or dioxane, optionally in the presence of a base (e.g., NEt3, DIPEA (Huenig's base) or DMAP). Alternatively, the carboxylic acids 68a can be converted into their acid chlorides 68b by treatment with, e.g. thionyl chloride or oxalyl chloride, neat or optionally in a solvent such as DCM. Reaction of the acid chloride with intermediates 68 in an appropriate solvent such as DCM or DMF and a base, e.g. NEt3, Huenig's base, pyridine, DMAP or lithium bis(trimethylsilyl)amide at temperatures ranging from 0° C. to the reflux temperature of the solvent or solvent mixture yields the acylated form of intermediates 67 that can be dehydrated for example under elevated temperatures to provide intermediates 69 (step b).
Removal of the protective group from intermediates 69 applying methods well known in the art and as described for example under Scheme 2, step c, furnishes intermediates X (step c).
Intermediates of type Y in which the 5-membered heteroaryl ring is an 1,3,4-oxadiazole further substituted at position-5 with an optionally further substituted phenyl ring can be prepared by methods described in literature or for example by the general synthetic procedure outlined in Scheme 19.
Acylation of acylhydrazides 70, either commercially available or prepared my methods well known in the art, with activated carboxylic acids 68a (X=H) or carboxylic acid chlorides 68b (X=Cl) applying the conditions described under Scheme 18, step b, provides intermediates 71 (step a).
Subsequent cyclodehydration of intermediates 71, for example by heating, yields intermediates 72 (step b).
Removal of the protective group from intermediates 72 applying methods well known in the art and as described for example under Scheme 2, step c, furnishes intermediates Y (step c).
In one aspect, the present invention provides a process of manufacturing the compounds of formula (I) as described herein, comprising:
In a further aspect, the present invention provides a process of manufacturing the compounds of formula (Ic) as described herein, comprising:
In one embodiment, there is provided a process according to the invention, wherein said base is sodium bicarbonate.
In one embodiment, there is provided a process according to the invention, wherein said urea forming reagent is selected from bis(trichloromethyl) carbonate, phosgene, trichloromethyl chloroformate, (4-nitrophenyl)carbonate and 1,1′-carbonyldiimidazole, preferably wherein said urea forming reagent is bis(trichloromethyl) carbonate.
In one aspect, the present invention provides a compound of formula (I) as described herein, when manufactured according to any one of the processes described herein.
Compounds of the present invention are MAGL inhibitors. Thus, in one aspect, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for inhibiting MAGL in a mammal.
In a further aspect, the present invention provides compounds of formula (I) and (Ic) as described herein for use in a method of inhibiting MAGL in a mammal.
In a further aspect, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for the preparation of a medicament for inhibiting MAGL in a mammal.
In a further aspect, the present invention provides a method for inhibiting MAGL in a mammal, which method comprises administering an effective amount of a compound of formula (I) and (Ic) as described herein to the mammal.
Compounds were profiled for MAGL inhibitory activity by measuring the enzymatic activity of MAGL by following the hydrolysis of 4-nitrophenylacetate resulting in 4-nitrophenol, which absorbs at 405-412 nm (G.G. Muccioli, G. Labar, D.M. Lambert, Chem. Bio. Chem. 2008, 9, 2704-2710). This assay is hereinafter abbreviated “4-NPA assay”.
The assay was carried out in 384 well assay plates (black with clear bottom, non-binding surface treated, Corning Ref. 3655) in a total volume of 40 μL. Compound dilutions were made in 100% DMSO (VWR Chemicals 23500.297) in a polypropylene plate in 3-fold dilution steps to give a final concentration range in the assay from 25 μM to 1.7 nM. 1 μL compound dilutions (100% DMSO) were added to 19 μL MAGL (recombinant wild-type) in assay buffer (50 mM TRIS (GIBCO, 15567-027), 1 mM EDTA (Fluka, 03690-100 mL)). The plate was shaked for 1 min at 2000 rpm (Variomag Teleshake) and then incubated for 15 min at RT. To start the reaction, 20 μL 4-Nitrophenlyacetate (Sigma N-8130) in assay buffer with 6% EtOH was added. The final concentrations in the assay were 1 nM MAGL and 300 μM 4-Nitrophenylacetate. After shaking (1 min, 2000 rpm) and 5 min incubation at RT, the absorbance at 405 nm was measured for a first time (Molecular Devices, SpectraMax Paradigm). A second measurement was then done after incubation for 80 min at RT. From the two measurements, the slope was calculated by subtracting the first from the second measurement.
Alternatively, compounds were profiled for MAGL inhibitory activity by determining the enzymatic activity by following the hydrolysis of the natural substrate 2-arachidonoylglycerol (2-AG) resulting in arachidonic acid, which can be followed by mass spectrometry. This assay is hereinafter abbreviated “2-AG assay”.
The 2-AG assay was carried out in 384 well assay plates (PP, Greiner Cat #784201) in a total volume of 20 μL. Compound dilutions were made in 100% DMSO (VWR Chemicals 23500.297) in a polypropylene plate in 3-fold dilution steps to give a final concentration range in the assay from 12.5 μM to 0.8 pM. 0.25 μL compound dilutions (100% DMSO) were added to 9 μL MAGL in assay buffer (50 mM TRIS (GIBCO, 15567-027), 1 mM EDTA (Fluka, 03690-100 mL), 0.01% (v/v) Tween. After shaking, the plate was incubated for 15 min at RT. To start the reaction, 10 μL 2-arachidonoylglycerol in assay buffer was added. The final concentrations in the assay was 50 pM MAGL and 8 μM 2-arachidonoylglyerol. After shaking and 30 min incubation at RT, the reaction was quenched by the addition of 40 μL of ACN containing 4 μM of d8-arachidonic acid. The amount of arachidonic acid was traced by an online SPE system (Agilent Rapidfire) coupled to a triple quadrupole mass spectrometer (Agilent 6460). A C18 SPE cartridge (G9205A) was used in an ACN/water liquid setup. The mass spectrometer was operated in negative electrospray mode following the mass transitions 303.1→259.1 for arachidonic acid and 311.1→267.0 for d8-arachidonic acid. The activity of the compounds was calculated based on the ratio of intensities [arachidonic acid/d8-arachidonic acid].
[a]if not indicated otherwise (see [b]), the activity was measured in 4-NPA assay;
[b]measured in 2-AG assay.
In one aspect, the present invention provides compounds of formula (I) and (Ic) and their pharmaceutically acceptable salts or esters as described herein, wherein said compounds of formula (I) and (Ic) and their pharmaceutically acceptable salts or esters have IC50's for MAGL inhibition below 25 μM, preferably below 10 μM, more preferably below 5 μM as measured in the MAGL assay described herein.
In one embodiment, compounds of formula (I) and (c) and their pharmaceutically acceptable salts or esters as described herein have IC50 (MAGL inhibition) values between 0.000001 μM and 25 μM, particular compounds have IC50 values between 0.000005 μM and 10 μM, further particular compounds have IC50 values between 0.00005 μM and 5 μM, as measured in the MAGL assay described herein.
In one embodiment, the present invention provides compounds of formula (I) and (Ic) and their pharmaceutically acceptable salts or esters as described herein, wherein said compounds of formula (I) and (Ic) and their pharmaceutically acceptable salts or esters have an IC50 for MAGL below 25 μM, preferably below 10 μM, more preferably below 5 μM as measured in an assay comprising the steps of:
Using the Compounds of the Invention
In one aspect, the present invention provides compounds of formula (I) and (Ic) as described herein for use as therapeutically active substance.
In a further aspect, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for the treatment or prophylaxis of neuroinflammation, neurodegenerative diseases, pain, cancer and/or mental disorders in a mammal.
In one embodiment, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for the treatment or prophylaxis of neuroinflammation and/or neurodegenerative diseases in a mammal.
In one embodiment, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for the treatment or prophylaxis of neurodegenerative diseases in a mammal.
In one embodiment, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for the treatment or prophylaxis of cancer in a mammal.
In one aspect, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for the treatment or prophylaxis of multiple sclerosis, Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, traumatic brain injury, neurotoxicity, stroke, epilepsy, anxiety, migraine, depression, hepatocellular carcinoma, colon carcinogenesis, ovarian cancer, neuropathic pain, chemotherapy induced neuropathy, acute pain, chronic pain and/or spasticity associated with pain in a mammal.
In a preferred embodiment, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for the treatment or prophylaxis of multiple sclerosis, Alzheimer's disease and/or Parkinson's disease in a mammal.
In a particularly preferred embodiment, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for the treatment or prophylaxis of multiple sclerosis in a mammal.
In one aspect, the present invention provides compounds of formula (I) and (Ic) as described herein for use in the treatment or prophylaxis of neuroinflammation, neurodegenerative diseases, pain, cancer and/or mental disorders in a mammal.
In one embodiment, the present invention provides compounds of formula (I) and (Ic) as described herein for use in the treatment or prophylaxis of neuroinflammation and/or neurodegenerative diseases in a mammal.
In one embodiment, the present invention provides compounds of formula (I) and (Ic) as described herein for use in the treatment or prophylaxis of cancer in a mammal.
In one embodiment, the present invention provides compounds of formula (I) and (Ic) as described herein for use in the treatment or prophylaxis of neurodegenerative diseases in a mammal.
In one aspect, the present invention provides compounds of formula (I) and (Ic) as described herein for use in the treatment or prophylaxis of multiple sclerosis, Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, traumatic brain injury, neurotoxicity, stroke, epilepsy, anxiety, migraine, depression, hepatocellular carcinoma, colon carcinogenesis, ovarian cancer, neuropathic pain, chemotherapy induced neuropathy, acute pain, chronic pain and/or spasticity associated with pain in a mammal.
In a preferred embodiment, the present invention provides compounds of formula (I) and (Ic) as described herein for use in the treatment or prophylaxis of multiple sclerosis, Alzheimer's disease and/or Parkinson's disease in a mammal.
In a particularly preferred embodiment, the present invention provides compounds of formula (I) and (Ic) as described herein for use in the treatment or prophylaxis of multiple sclerosis in a mammal.
In one aspect, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for the preparation of a medicament for the treatment or prophylaxis of neuroinflammation, neurodegenerative diseases, pain, cancer and/or mental disorders in a mammal.
In one embodiment, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for the preparation of a medicament for the treatment or prophylaxis of neuroinflammation and/or neurodegenerative diseases in a mammal.
In one embodiment, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for the preparation of a medicament for the treatment or prophylaxis of neurodegenerative diseases in a mammal.
In one embodiment, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for the preparation of a medicament for the treatment or prophylaxis of cancer in a mammal.
In a further aspect, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for the preparation of a medicament for the treatment or prophylaxis of multiple sclerosis, Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, traumatic brain injury, neurotoxicity, stroke, epilepsy, anxiety, migraine, depression, hepatocellular carcinoma, colon carcinogenesis, ovarian cancer, neuropathic pain, chemotherapy induced neuropathy, acute pain, chronic pain and/or spasticity associated with pain in a mammal.
In a preferred embodiment, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for the preparation of a medicament for the treatment or prophylaxis of multiple sclerosis, Alzheimer's disease and/or Parkinson's disease in a mammal.
In a particularly preferred embodiment, the present invention provides the use of compounds of formula (I) and (Ic) as described herein for the preparation of a medicament for the treatment or prophylaxis of multiple sclerosis in a mammal.
In one aspect, the present invention provides a method for the treatment or prophylaxis of neuroinflammation, neurodegenerative diseases, pain, cancer and/or mental disorders in a mammal, which method comprises administering an effective amount of a compound of formula (I) or (Ic) as described herein to the mammal.
In one embodiment, the present invention provides a method for the treatment or prophylaxis of neuroinflammation and/or neurodegenerative diseases in a mammal, which method comprises administering an effective amount of a compound of formula (I) or (Ic) as described herein to the mammal.
In one embodiment, the present invention provides a method for the treatment or prophylaxis of neurodegenerative diseases in a mammal, which method comprises administering an effective amount of a compound of formula (I) or (Ic) as described herein to the mammal.
In one aspect, the present invention provides a method for the treatment or prophylaxis of multiple sclerosis, Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, traumatic brain injury, neurotoxicity, stroke, epilepsy, anxiety, migraine, depression and/or pain in a mammal, which method comprises administering an effective amount of a compound of formula (I) or (Ic) as described herein to the mammal.
In a preferred embodiment, the present invention provides a method for the treatment or prophylaxis of multiple sclerosis, Alzheimer's disease and/or Parkinson's disease in a mammal, which method comprises administering an effective amount of a compound of formula (I) or (Ic) as described herein to the mammal.
In a particularly preferred embodiment, the present invention provides a method for the treatment or prophylaxis of multiple sclerosis in a mammal, which method comprises administering an effective amount of a compound of formula (I) or (Ic) as described herein to the mammal.
In one aspect, the present invention provides a pharmaceutical composition comprising a compound of formula (I) as described herein and a therapeutically inert carrier.
The compounds of formula (I) and their pharmaceutically acceptable salts and esters can be used as medicaments (e.g. in the form of pharmaceutical preparations). The pharmaceutical preparations can be administered internally, such as orally (e.g. in the form of tablets, coated tablets, dragées, hard and soft gelatin capsules, solutions, emulsions or suspensions), nasally (e.g. in the form of nasal sprays) or rectally (e.g. in the form of suppositories). However, the administration can also be effected parentally, such as intramuscularly or intravenously (e.g. in the form of injection solutions).
The compounds of formula (I) and their pharmaceutically acceptable salts and esters can be processed with pharmaceutically inert, inorganic or organic adjuvants for the production of tablets, coated tablets, dragées and hard gelatin capsules. Lactose, corn starch or derivatives thereof, talc, stearic acid or its salts etc. can be used, for example, as such adjuvants for tablets, dragées and hard gelatin capsules.
Suitable adjuvants for soft gelatin capsules are, for example, vegetable oils, waxes, fats, semi-solid substances and liquid polyols, etc.
Suitable adjuvants for the production of solutions and syrups are, for example, water, polyols, saccharose, invert sugar, glucose, etc.
Suitable adjuvants for injection solutions are, for example, water, alcohols, polyols, glycerol, vegetable oils, etc.
Suitable adjuvants for suppositories are, for example, natural or hardened oils, waxes, fats, semi-solid or liquid polyols, etc.
Moreover, the pharmaceutical preparations can contain preservatives, solubilizers, viscosity-increasing substances, stabilizers, wetting agents, emulsifiers, sweeteners, colorants, flavorants, salts for varying the osmotic pressure, buffers, masking agents or antioxidants. They can also contain still other therapeutically valuable substances.
The dosage can vary in wide limits and will, of course, be fitted to the individual requirements in each particular case. In general, in the case of oral administration a daily dosage of about 0.1 mg to 20 mg per kg body weight, preferably about 0.5 mg to 4 mg per kg body weight (e.g. about 300 mg per person), divided into preferably 1-3 individual doses, which can consist, for example, of the same amounts, should be appropriate. It will, however, be clear that the upper limit given herein can be exceeded when this is shown to be indicated.
In accordance with the invention, the compounds of formula (I) or their pharmaceutically acceptable salts and esters can be used for the treatment or prophylaxis of type 2 diabetes related microvascular complications (such as, but not limited to diabetic retinopathy, diabetic neuropathy and diabetic nephropathy), coronary artery disease, obesity and underlying inflammatory diseases, chronic inflammatory and autoimmune/inflammatory diseases.
The invention will be more fully understood by reference to the following examples. The claims should not, however, be construed as limited to the scope of the examples.
In case the preparative examples are obtained as a mixture of enantiomers, the pure enantiomers can be separated by methods described herein or by methods known to the man skilled in the art, such as e.g., chiral chromatography (e.g., chiral SFC) or crystallization.
All reaction examples and intermediates were prepared under an argon atmosphere if not specified otherwise.
To a solution of 4-nitrophenyl 4-benzhydrylpiperidine-1-carboxylate (40 mg, 96 μmol, BB1) in DMF (1 mL), TEA (19.4 mg, 26.8 μL, 192 μmol), rac-cis-hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (15 mg, 96 μmol, ChemBridge Corporation) was added and the resultant reaction mixture was heated at 80° C. for 18 hours resulting in reaction completion. The reaction mixture was diluted with H2O and NaHCO3 and extracted three times with EtOAc. The combined organic layers were washed with brine, dried over Na2SO4, filtered and evaporated. The product was purified by preparative HPLC (Gemini NX column) using a gradient of ACN:H2O (containing 0.1% FA) (20:80 to 98:2) to yield the desired compound as a colorless solid (0.015 g; 36.5%). MS (ESI): m/z=434.2 [M+H]+.
To an ice-cold suspension of bis(trichloromethyl) carbonate (45.3 mg, 153 μmol, CAS RN 32315-10-9) and NaHCO3 (73.3 mg, 873 μmol) in DCM (1 mL) was added 5-chloro-1-(cyclopropylmethyl)-3-(piperidin-4-yl)-1H-indole acetate formate (76.1 mg, 218 μmol, BB2) in one portion and the mixture was stirred at RT overnight. After cooling down in an-ice bath rac-cis-hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one dihydrochloride (50 mg, 218 μmol, ChemBridge Corporation) and DIPEA (112 mg, 152 μL, 870 μmol) were added. The suspension was stirred at RT for 6 hours. The reaction mixture was poured on H2O and DCM and the layers were separated. The aqueous layer was extracted twice with DCM. The organic layers were dried over MgSO4, filtered, reacted with silica gel and evaporated. The compound was purified by silica gel chromatography on a 4 g column using an MPLC system eluting with a gradient of DCM:MeOH (100:0 to 90:10) to get the desired compound as a colorless gum (0.070 g; 68.1%). MS (ESI): m/z=471.2 [M+H]+.
To an ice-cold solution of bis(trichloromethyl) carbonate (26.6 mg, 89.6 μmol) in DCM (1 mL) were added NaHCO3(32.3 mg, 384 μmol) and rac-cis-hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (20 mg, 128 μmol, ChemBridge Corporation) and the mixture was stirred at RT overnight. The suspension was cooled down to 0° C. before 5-chloro-1-(oxetan-3-yl)-3-(piperidin-4-yl)-1H-indole (37.2 mg, 128 μmol, BB10) and DIPEA (49.7 mg, 67.1 μL, 384 μmol) were added. The mixture was stirred at RT for 1 hour. The reaction mixture was poured on water and DCM and the layers were separated. The aqueous layer was extracted twice with DCM. The organic layers were dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 4 g column using an MPLC system eluting with a gradient of DCM:MeOH (100:0 to 90:10) to get the desired compound as a colorless solid (0.025 g; 41.3%). MS (ESI): m/z=473.2 [M+H]+.
To a suspension of 4-nitrophenyl (4aR,8aS)-3-oxohexahydro-2H-pyrido[4,3-b][1,4]oxazine-6(5H)-carboxylate (50 mg, 156 μmol, BB15a) and DIPEA (50.3 mg, 68 μL, 389 μmol) in ACN (0.7 mL) was added a solution of 3-cyclopropyl-5-((4-fluorophenyl)(piperidin-4-yl)methyl)-1,2,4-oxadiazole hydrochloride (55.2 mg, 163 μmol, BB39) in ACN (0.7 mL) and the solution was stirred at RT overnight. The light yellow solution was stirred at reflux for 23 h and then evaporated. The residue was dissolved in 2M aqueous Na2CO3 solution and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The organic layers were washed once with water, dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 4 g column using an MPLC system eluting with a gradient of n-heptane:EtOAc/EtOH 3/1 (70:30 to 90:10) to get the desired compound as a light brown solid (0.022 g; 29.2%). MS (ESI): m/z=484.2 [M+H]+.
A suspension of (4-chlorophenyl)boronic acid (15.9 mg, 101 μmol, CAS RN 1679-18-1), (4aR,8aS)-6-(3-(4-bromophenyl)azetidine-1-carbonyl)hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (40 mg, 101 μmol, example 110), potassium carbonate (70.1 mg, 507 μmol), water (100 μL) and tetrakis(triphenylphosphine)palladium (0) (5.86 mg, 5.07 μmol, CAS RN 14221-01-3) in THF (1 mL) was stirred at 80° C. for 3 h. The reaction mixture was poured on water and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The organic layers were dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 4 g column using an MPLC system eluting with a gradient of n-heptane:EtOAc/EtOH (3/1 v/v) (70:30 to 10:90) to yield the desired compound as a colorless solid (0.020 g; 46.3%). MS (ESI): m/z=426.16 [M+H]+.
To a solution of (4aR,8aS)-6-(3-(4-bromophenyl)azetidine-1-carbonyl)hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (50 mg, 127 μmol, example 110) in tert-butanol (1 mL) under argon were added XPhos (5.44 mg, 11.4 μmol, CAS RN 564483-18-7), tris(dibenzylideneacetone)dipalladium (0) chloroform adduct (3.94 mg, 3.8 μmol, CAS RN 52522-40-4), 3-methoxyazetidine hydrochloride (23.5 mg, 190 μmol, CAS RN 148644-09-1) and cesium carbonate (165 mg, 507 μmol) and the mixture was heated to 85° C. for 21 h. The mixture was filtered and the filtrate was evaporated. The product was purified on a preparative HPLC (Gemini NX column) using a gradient of ACN:water (containing 0.1% formic acid) (20:80 to 98:2) to get the desired compound as a colorless solid (0.006 g; 11.8%). MS (ESI): m/z=401.2 [M+H]+. Alternatively, the reaction can also be carried out in a microwave oven at 100° C.
To a 5 mL vial equipped with a stirring bar was added (Ir[dF(CF3)ppy]2(dtbpy))PF6 (1.42 mg, 1.27 μmol, CAS RN 870987-63-6), 3-bromooxetane (17.4 mg, 127 μmol, CAS RN 39267-79-3), (4aR,8aS)-6-(3-(4-bromophenyl)azetidine-1-carbonyl)hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (50 mg, 127 μmol, example 110), tris(trimethylsilyl)silane (31.5 mg, 39.1 μL, 127 μmol, CAS RN 1873-77-4) and anhydrous sodium carbonate (26.9 mg, 254 μmol). The vial was sealed and placed under argon before DME (1 mL) was added. To a separate vial was added nickel(II) chloride ethylene glycol dimethyl ether complex (2.79 mg, 12.7 μmol, CAS RN 29046-78-4) and 4,4′-di-tert-butyl-2,2′-bipyridine (3.4 mg, 12.7 μmol, CAS RN 72914-19-3). The precatalyst vial was sealed, purged with argon and then DME (0.4 mL) was added. The precatalyst vial was sonicated for 5 min, after which, 0.4 mL (0.5 mol % catalyst, 0.01 eq) of it was syringed into the reaction vessel. The reaction mixture was degassed with argon. The reaction was stirred and irradiated with a 420 nm lamp for 4 h. The reaction was quenched by exposure to air, filtered and washed with a small volume of EtOAc. The filtrate was treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 4 g column using an MPLC (ISCO) system eluting with a gradient of n-heptane:EtOAc/EtOH 3/1 (v/v) (70:30 to 10:90) to furnish the desired compound as a light yellow solid (0.010 g; 21.2%). MS (ESI): m/z=372.3 [M+H]+.
To a solution of [4-[1-[(4aR,8aS)-3-oxo-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazine-6-carbonyl]azetidin-3-yl]phenyl]boronic acid (100.0 mg, 0.280 mmol, BB38) and 2-bromo-5-chlorobenzonitrile (120.5 mg, 0.560 mmol, CAS RN 57381-37-0) and CsF (127 mg, 0.840 mmol) in DMF (5 mL) was added Pd(dppf)Cl2 (40.8 mg, 0.060 mmol), the mixture was stirred at 90° C. under N2 atmosphere for 12 h. The mixture was filtered and the filtrate was diluted with water (20 mL) and extracted with EtOAc (10 mL three times), the combined organic phase was washed with brine, dried over Na2SO4 and concentrated, the residue was purified by prep-HPLC (FA) and lyophilized to get the desired compound as white solid (38.8 mg, 30.7%). MS (ESI): m/z=451.1 [M+H]+.
To a solution of 3-(1-(2-chloro-4-(trifluoromethyl)phenoxy)ethyl)azetidine 2,2,2-trifluoroacetate (BB94) (133.5 mg, 207 μmol) in a mixture of CH3CN (517 μL) and 2-propanol (517 μL) was added DIPEA (66.8 mg, 90.3 μL, 517 μmol) and 4-nitrophenyl (4aR,8aS)-3-oxohexahydro-2H-pyrido[4,3-b][1,4]oxazine-6(5H)-carboxylate (66.5 mg, 207 μmol, BB15a). The reaction vial was stirred at 90° C. for 21 h. A further portion of 4-nitrophenyl (4aR,8aS)-3-oxohexahydro-2H-pyrido[4,3-b][1,4]oxazine-6(5H)-carboxylate (19.9 mg, 62.1 μmol, BB15a) and DIPEA (8.02 mg, 10.8 μL, 62.1 μmol) were added and the mixture was heated to 95° C. for 23 h. The crude material was submitted for reversed-phase achiral HPLC purification to yield (4aR,8aS)-6-(3-(1-(2-chloro-4-(trifluoromethyl)phenoxy)ethyl)azetidine-1-carbonyl)hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (88 mg, 92.1%) as a white solid. The epimers were separated by chiral HPLC to yield examples 75 (33.6 mg) and example 76 (43.2 mg) as yellow solids. MS (ESI): m/z=462.2 [M+H]+ for both compounds.
To a solution of 3-(1-(2-fluoro-4-(trifluoromethyl)phenoxy)ethyl)azetidine 2,2,2-trifluoroacetate, BB97 (51.4 mg, 136 μmol) in CH3CN (681 μL) was added DIPEA (52.8 mg, 71.4 μL, 409 μmol) and 4-nitrophenyl (4aR,8aS)-3-oxohexahydro-2H-pyrido[4,3-b][1,4]oxazine-6(5H)-carboxylate (43.8 mg, 136 μmol, BB15a). The reaction vial was stirred at 95° C. for 3 h. The crude material was submitted for reversed-phase HPLC purification to yield (4aR,8aS)-6-(3-(1-(2-fluoro-4-(trifluoromethyl)phenoxy)ethyl)azetidine-1-carbonyl)hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (example 91; 31 mg, 51%) as an off-white solid. MS (ESI): m/z=446.3 [M+H]+. This racemic product was submitted to chiral SFC separation to yield (4aR,8aS)-6-(3-((R or S)-1-(2-fluoro-4-(trifluoromethyl)phenoxy)ethyl)azetidine-1-carbonyl)hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (15.9 mg, example 96) and (4aR,8aS)-6-(3-((S or R)-1-(2-fluoro-4-(trifluoromethyl)phenoxy)ethyl)azetidine-1-carbonyl)hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (15.2 mg, example 97) as white solids. MS (ESI): m/z=446.2 [M+H]+ for both compounds.
To a ice-cold solution of triethylamine trihydrofluoride (31.8 mg, 32.1 μL, 197 μmol) in DCM (493 μL) under argon was added (diethylamino)difluorosulfonium tetrafluoroborate (33.9 mg, 148 μmol, CAS RN 63517-29-3) followed by (4aR,8aS)-6-(3-(bis(4-fluorophenyl)(hydroxy)methyl)azetidine-1-carbonyl)hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (example 54) (45.1 mg, 98.6 μmol) in DCM (493 μL), and the mixture was stirred for 70 min at 0° C. and at then at RT for 25 min. The reaction was quenched at 0° C. with saturated aqueous NaHCO3 solution and stored in the fridge overnight. The phases were separated and the aqueous layer was extracted twice with DCM. The combined organic layers were washed with brine, dried over Na2SO4 and concentrated to give a pale oil. The crude material was submitted for reversed-phase HPLC purification to yield the desired compound as a white solid (20 mg, 41.5%). MS (ESI): m/z=504.18 [M+HCOO]−.
To a solution of (4aR,8aS)-6-(3-(4-bromo-3-chlorophenyl)azetidine-1-carbonyl)hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (example 132, 0.020 g, 0.047 mmol) in dioxane (0.5 mL) was added Pd2(dba)3 (0.004 g, 0.0047 mmol), Xantphos (0.003 g, 0.0047 mmol) and cesium carbonate (0.030 g, 0.093 mmol). The mixture was degassed with argon, then 3-methylazetidine hydrochloride (CAS RN 1375472-05-1, 0.010 g, 0.093 mmol) was added and the reaction mixture was heated to 100° C. for 16 h. After this time, 3-methylazetidine hydrochloride (0.005 g, 0.047 mmol), Pd2(dba)3 (0.004 g, 0.0047 mmol), Xantphos (0.003 g, 0.0047 mmol) and cesium carbonate (0.015 g, 0.047 mmol) were added and the reaction mixture was heated to 100° C. for another 2 h. The mixture was diluted with EtOAc and washed with H2O and brine. The organic phase was dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by prep-HPLC to give the title compound (0.007 g, 36%) as a yellow solid. MS (ESI): m/z=419.3 [M+H]+.
The racemate (product of example 7) was separated on a preparative chiral HPLC (Reprosil Chiral NR column) using an isocratic mixture of EtOH (containing 0.05% of NH4OAc):n-heptane (60:40). The fractions were evaporated to get the desired compound as a light yellow solid (0.009 mg). MS (ESI): m/z=401.2 [M+H]+.
The enantiomers of example 12 were separated on a preparative chiral HPLC (Chiralcel OD column) using an isocratic mixture of EtOH (containing 0.05% of NH4OAc):n-heptane (80:20). The fractions were evaporated to get the desired compound as a colorless solid (0.014 g). MS (ESI): m/z=471.3 [M+H]+.
and
The enantiomers of racemic example 26 were separated by preparative chiral HPLC (Chiralpak AD column) using an isocratic mixture of EtOH (containing 0.05% of NH4OAc):n-heptane (40:60). The fractions were evaporated. The residue was taken up in EtOH, DCM and n-heptane and again evaporated to remove excess of AcOH. The compounds were purified by silica gel chromatography on a 4 g column using an MPLC (ISCO) system eluting with a gradient of DCM:MeOH (100:0 to 80:20) to provide the desired products as colorless gums. (0.004 g; 7.7% and 0.010 g, 19%). MS (ESI): m/z=420.2 [M+H]+ for each stereoisomer.
The racemate of example 68 was separated by preparative chiral SFC (IA, 12 nm, 5 μm, 250×4.6 mm column) using an isocratic mixture of MeOH:carbon dioxide (25:75). The fractions containing the were evaporated to get the desired product as a light brown solid (0.016 g, 40.0%). MS (ESI): m/z=484.2 [M+H]+.
The enantiomers of example 90 were separated by preparative chiral SFC (OZ-H, 220 nm, 250×10 mm column) using an isocratic mixture of MeOH:carbon dioxide (20:80). The fractions were evaporated to give the title products as colorless amorphous solids (0.005 g). MS (ESI): m/z=428.4 [M+H]+ for both enantiomers.
To a solution of (+)- or (−)-cis-6-(4-(1-(2-((tert-butyldimethylsilyl)oxy)ethyl)-5-chloro-1H-indol-3-yl)piperidine-1-carbonyl)hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (39 mg, 67.8 μmol, example 24) in DCM (0.5 mL) was added TFA (77.3 mg, 52.2 μL, 678 μmol) and the solution was stirred at RT for 1.5 hours. To the light yellow solution were added THF (0.1 mL) and H2O (0.1 mL) and stirring was continued at RT for 96 hours. The reaction mixture was evaporated. The residue was poured on saturated aqueous NaHCO3 solution and DCM and the layers were separated. The aqueous layer was extracted twice with DCM. The organic layers were dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 4 g column using an MPLC system eluting with a gradient of DCM:MeOH (100:0 to 90:10) to provide the desired compound as a colorless solid (0.014 g; 44.8%). MS (ESI): m/z=461.2 [M+H]+.
A solution of (4aR,8aS)-6-(3-(4′-chloro-2′-fluoro-[1,1′-biphenyl]-4-yl)azetidine-1-carbonyl)hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (27 mg, 60.8 μmol, example 133) in DMSO (0.5 mL) was treated with sodium methanethiolate (4.26 mg, 60.8 μmol) and stirred at 100° C. overnight. Another batch of sodium methanethiolate (4.26 mg, 60.8 μmol) were added and stirring was continued at 100° C. for 2 h. After cooling down, the mixture was poured on water and the layers were separated. The organic layers were extracted twice with EtOAc. The organic layers were dried over MgSO4, filtered and evaporated. The obtained crude intermediate (112 mg, light yellow oil) was dissolved in DCM (0.7 mL) and m-chloroperbenzoic acid (98.2 mg, 195 μmol) was added at RT. The mixture was stirred at RT and stirring was continued at RT for 1 h. The reaction mixture was poured on saturated aqueous NaHCO3 solution and DCM and the layers were separated. The aqueous layer was extracted twice with DCM. The organic layers were dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 4 g column using an MPLC system eluting with a gradient of DCM:MeOH (100:0 to 90:10) to get the desired intermediate sulfoxide as a colorless gum (0.014 g). It was dissolved in DCM (0.7 mL) and m-chlorperbenzoic acid (43.6 mg, 195 μmol) was added. Stirring was continued at RT for 3 h. The reaction mixture was poured on saturated aqueous NaHCO3 solution and DCM and the layers were separated. The aqueous layer was extracted twice with DCM. The organic layers were dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 4 g column using an MPLC system eluting with a gradient of DCM:MeOH (100:0 to 90:10) to get the desired compound as a colorless solid (0.004 g; 13.0%). MS (ESI): m/z=504.1 [M+H]+.
To a solution of (4aR,8aS)-6-(3-(5-chloropyridin-2-yl)azetidine-1-carbonyl)hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (63 mg, 180 μmol, example 181) in dioxane (0.5 mL) under argon were added tricyclohexylphosphine (4.03 mg, 14.4 μmol, CAS RN 2622-14-2), tris(dibenzylideneacetone)dipalladium (0) chloroform adduct (7.44 mg, 7.18 μmol), (2,4-dichlorophenyl)boronic acid (36 mg, 189 μmol, CAS RN 68716-47-2), and Cs2CO3 (70.2 mg, 216 μmol) and the mixture was stirred at 100° C. overnight. The reaction mixture was poured on water and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The combined organic layers were dried over MgSO4, filtered and evaporated. The product was purified by preparative HPLC (Gemini NX column) using a gradient of ACN:water (containing 0.1% TEA) (20:80 to 98:2) to furnish the desired compound as a light brown solid (0.0038 g; 4.6%). MS (ESI): m/z=461.1 [M+H]+.
A solution of 3-[phenyl(4-piperidyl)methyl]pyridazine (70 mg, 0.28 mmol, BB86) and (4-nitrophenyl) (4aR,8aS)-3-oxo-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazine-6-carboxylate (intermediate BB15a) (106 mg, 0.330 mmol) in pyridine (3 mL) was stirred at 80° C. for 16 h. The solution was filtered and concentrated under vacuum to give a residue, which was purified by prep-HPLC (basic conditions) to yield (4aR,8aS)-6-[4-[phenyl(pyridazin-3-yl)methyl]piperidine-1-carbonyl]-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazin-3-one (5.9 mg, 5%) as a grey solid. MS (ESI): m/z=436.2 [M+H]+.
To a stirred solution of 3-[4-(3-fluoropropyl)phenyl]azetidine (40 mg, 0.21 mmol, BB87) and DIPEA (0.07 mL, 0.41 mmol) in MeCN (0.9 mL) at 20° C. was added (4-nitrophenyl) (4aR,8aS)-3-oxo-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazine-6-carboxylate (66 mg, 0.210 mmol; BB15a). The resulting mixture was stirred at 80° C. for 16 h. The solution was concentrated under vacuum to give a residue, which was purified by prep-HPLC (TFA condition) to give (4aR,8aS)-6-[3-[4-(3-fluoropropyl)phenyl]azetidine-1-carbonyl]-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazin-3-one (16 mg, 17%, 84% purity) as white solid. This material was combined with the product obtained from a second reaction on similar scale (0.23 mmol 3-[4-(3-fluoropropyl)phenyl]azetidine), and purified a second time by prep-HPLC (TFA conditions) to give the title compound as a white solid. MS (ESI): m/z=376.3 [M+H]+.
To a solution of tert-butyl (2-(3-((1-((4aR,8aS)-3-oxooctahydro-2H-pyrido[4,3-b][1,4]oxazine-6-carbonyl)piperidin-4-yl)(phenyl)methyl)phenoxy)ethyl)carbamate (Example 237; 178 mg, 300 μmol) in DCM (2.5 mL) was added TFA (274 mg, 185 μL, 2.4 mmol) and the reaction mixture was stirred at ambient temperature for 3 hours. EtOAc and aqueous KHCO3 solution were added. The layers were separated and the aqueous phase was extracted with EtOAc. The combined organic layers were dried over Na2SO4. The solvent was removed under reduced pressure to give the title compound (148 mg, quant.) as a light yellow foam. MS (ESI): m/z=493.3 [M+H]+.
DIPEA (52.5 mg, 70.9 μL, 406 μmol) was added to a mixture of (4aR,8aS)-6-(4-((3-(2-aminoethoxy)phenyl)(phenyl)methyl)piperidine-1-carbonyl)hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (Example 252; 50 mg, 101 μmol), 3-(2-t-boc-aminoethoxy)propanoic acid (CAS RN 1260092-44-1; 23.7 mg, 101 μmol) and HATU (42.5 mg, 112 μmol) in DMF (203 μL). The mixture was stirred at ambient temperature for 18 h. Ethyl acetate and aqueous KHCO3 solution were added. The layers were separated and the organic phase was washed two times with water. The organic layer was dried over Na2SO4. The solvent was removed under reduced pressure to give the title compound (71 mg, quant.) as colorless oil, MS (ESI): m/z=708.4 [M+H]+.
DIPEA (52.5 mg, 70.9 μL, 406 μmol) was added to a mixture of (4aR,8aS)-6-(4-((3-(2-aminoethoxy)phenyl)(phenyl)methyl)piperidine-1-carbonyl)hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (Example 252; 50 mg, 101 μmol), 13,13-dimethyl-1l-oxo-4-7,12-tioxa-10-azatetradecanoic acid (CAS RN 1365655-91-9; 28.1 mg, 101 μmol) and HATU (42.5 mg, 112 μmol) in DMF (135 μL). The mixture was stirred at ambient temperature for 18 h. Ethyl acetate and aqueous KHCO3 solution were added. The layers were separated and the organic phase was washed two times with water. The organic layer was dried over Na2SO4. The solvent was removed under reduced pressure to give the title compound (76 mg, quant.) as colorless oil, MS (ESI): m/z=774.4 [M+Na]+.
To a suspension of (4aR,8aS)-6-(3-(4-hydroxyphenyl)azetidine-1-carbonyl)hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one (0.032 g, 96.6 μmol, BB145) and potassium carbonate (16 mg, 116 μmol) in DMF (0.4 mL) was added 1-iodopropane (19.7 mg, 11.3 μL, 116 μmol) and the mixture was stirred at 50° C. in a sealed tube overnight. The mixture was filtered and the filter cake was washed with a few drops of DMF. The product was purified on a preparative HPLC (YMC Triart C18 column) using a gradient of ACN:water (containing 0.1% TEA) (20:80 to 100:0) to provide the desired compound as a colorless solid (0.013 g; 36.0%). MS (ESI): m/z=374.3 [M+H]+.
To a solution of (4aR,8aS)-6-[3-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]azetidine-1-carbonyl]-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazin-3-one (100.0 mg, 0.230 mmol, BB91), Na2CO3 (48.03 mg, 0.450 mmol) and 2-bromo-N-ethyl-5-methyl-benzamide (54.86 mg, 0.230 mmol, BB92) in 1,4-dioxane (4 mL) and water (1 mL) was added Pd(dppf)Cl2 (16.58 mg, 0.020 mmol) and the mixture was stirred at 100° C. under N2 atmosphere. After stirring at this temperature for 12 h the mixture was poured into water (20 mL) and extracted three times with EtOAc (10 mL). The combined organic layers were washed with brine and dried over Na2SO4, concentrated, the residue was purified by reverse flash chromatography (0.1% v/v FA) followed by prep-HPLC (0.225% v/v FA) to give the desired product (13.8 mg, 12.5%) as a white solid. MS (ESI): m/z=477.3 [M+H]+.
If not indicated otherwise the following examples of Table 2 were synthesized from the suitable building blocks in analogy to the reaction methods described herein.
To a solution of 4-benzhydrylpiperidine (50 mg, 199 μmol, CAS RN 19841-73-7) in DCM (1.2 mL), TEA (40.3 mg, 55.4 μL, 398 μmol) was added. On cooling to 0° C., 4-nitrophenyl carbonochloridate (44.1 mg, 219 μmol, CAS RN 7693-46-1) was added, the reaction mixture was allowed to warm to RT and stirred for 18 hours. The reaction mixture was diluted with DCM and subsequently washed with H2O and sat. aqueous NaHCO3 solution, the combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The crude material was purified by flash chromatography (silica gel 10 g, eluting with EtOAc/n-heptane 0-50%), to afford the title compound as a light yellow solid (75 mg, 90.5%). MS (ESI): m/z=417.4 [M+H]+.
A mixture of tert-butyl 4-[5-chloro-1-(cyclopropylmethyl)indol-3-yl]piperidine-1-carboxylate (400.0 mg, 1.03 mmol) in HCl/EtOAc (4M, 15.0 mL) was stirred at 20° C. for 15 hours. The mixture was concentrated in vacuum and the residue was suspended in H2O (5 mL). The pH was adjusted to pH=7 with ammonia, then purified by prep-HPLC (0.1% FA in H2O and ACN) to afford the title compound as a white solid (215.9 mg, 62.6%). MS (ESI): m/z=289.1 [M+H]+.
A mixture of (bromomethyl)cyclopropane (0.17 mL, 1.79 mmol; CAS RN 7051-34-5), tert-butyl 4-(5-chloro-1H-indol-3-yl)piperidine-1-carboxylate (500.0 mg, 1.49 mmol, BB9, intermediate step b), 15-crown-5 (0.06 mL, 0.300 mmol; CAS RN 33100-27-5) and sodium tert-butoxide (287.01 mg, 2.99 mmol; CAS RN 865-48-5) in anhydrous EtOH (5 mL) was stirred at 25° C. for 12 hours. The mixture was diluted with H2O (20 mL), extracted three times with EtOAc (40 mL each) and concentrated under vacuum. The residue was purified by flash silica gel column chromatography (100-200 mesh) using a gradient of PE:EtOAc (50:1 to 20:1) to afford the title compound as a light yellow solid (400 mg, 68.8%). MS (ESI): m/z=411.1 [M+Na]+.
A mixture of tert-butyl 4-(5-chloro-1-methyl-indol-3-yl)piperidine-1-carboxylate (480.0 mg, 1.38 mmol) in HCl/EtOAc (20.0 mL, 6M) was stirred at 20° C. for 15 hours. The mixture was concentrated under vacuum, adjusted to pH-7 using aqueous ammonia, and then concentrated to give a residue which was purified by prep-HPLC to afford the title compound as a colorless powder (172.3 mg, 49.3%). MS (ESI): m/z=249.2 [M+H]+.
To a mixture of NaH 60% in mineral oil (119.46 mg, 2.99 mmol) in THF (20 mL) was added a solution of tert-butyl 4-(5-chloro-1H-indol-3-yl)piperidine-1-carboxylate (500.0 mg, 1.49 mmol, BB9, intermediate step b) in THF (5 mL) at 0° C. The mixture was stirred at 0° C. for 0.5 hours, then Mel (211.95 mg, 1.49 mmol) were added. The mixture was stirred at 0° C. for 1 hour, poured into H2O (5 mL) and extracted with EtOAc (20 mL×3). The combined organic layers were washed with brine (10 mL), dried over Na2SO4, filtered and concentrated to afford the title compound as light yellow solid (480 mg, 92.1%). MS (ESI): m/z=349.1 [M-Boc+H]+.
To a solution of 4-(9H-fluoren-9-yl)pyridine (70 mg, 288 μmol) in AcOH (1 mL) was added platinum(IV) oxide (10 mg, 44 μmol). The reaction mixture was stirred overnight under a hydrogen atmosphere of 20 bar at 40° C. The reaction mixture was filtered, and the filtrate was washed with AcOH. The thus obtained solution was concentrated in vacuo. The residue was dissolved in DCM, and the DCM was washed three times with aqueous saturated NaHCO3 solution. The organic layer was dried over MgSO4, filtered, and concentrated to give the desired product. (0.060 g; 83%). MS (ESI): m/z=250.2 [M+H]+.
To a solution of diphenyl(4-pyridyl)methanol (135 mg, 517 μmol) in FA (2 mL) was added sulfuric acid (0.8 mL) dropwise. The mixture was heated to 100° C. for 15 minutes, cooled to RT and poured into 20 mL aqueous 5N NaOH solution, which caused the product to precipitate. The product was collected by filtration, to give the product as a light yellow solid (75 mg, 60%). MS (ESI): m/z=244.2 [M+H]+.
To a solution of phenyl(pyridin-4-yl)methanone (0.52 g, 2.84 mmol, CAS RN 14548-46-0) in THF (10 mL) was added dropwise phenylmagnesium bromide 1M solution in THF (9 mL, 9 mmol, CAS RN 100-58-3) at RT for 2 hours. The reaction mixture was poured on saturated aqueous NH4Cl solution and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The organic layers were washed with brine, dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 4 g column using an MPLC system eluting with a gradient of DCM:MeOH (100:0 to 90:10) to yield the desired compound as a colorless solid (0.290 g; 39.0%). MS (ESI): m/z=262.2 [M+H]+.
To a solution of tert-butyl 4-(1-(4-fluorophenyl)-3-methoxy-propyl)piperidine-1-carboxylate (95 mg, 270 μmol) in dioxane (0.3 mL) was added HCl 4M in dioxane (338 μL, 1.35 mmol) and the mixture was stirred at RT for 2 h. The light yellow solution was completely evaporated. The residue was taken up in saturated aqueous NaHCO3 solution and DCM and the layers were separated. The aqueous layer was extracted twice with DCM. The organic layers were dried over MgSO4, filtered and evaporated to yield the desired compound as a light yellow oil (0.057 g; 83.9%). MS (ESI): m/z=252.3 [M+H]+.
To an ice-cold solution of tert-butyl 4-(1-(4-fluorophenyl)-3-hydroxy-propyl)piperidine-1-carboxylate (95 mg, 282 μmol) in THF (1 mL) was added NaH 55% in mineral oil (13.5 mg, 310 μmol) and the mixture was stirred at this temperature for 30 minutes before iodomethane (47.9 mg, 21.1 μL, 337 μmol) was added. After stirring at this temperature for 30 minutes, the turbid solution was allowed to warm up to RT. After stirring at RT for 4 hours, the reaction mixture was poured on H2O and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The organic layers were dried over MgSO4, filtered, and evaporated to get the desired compound as a light yellow oil (0.097 g; 98.0%). MS (ESI): m/z=252 [M-Boc+H]+.
To a solution of tert-butyl 4-[3-ethoxy-1-(4-fluorophenyl)-3-oxo-propyl]piperidine-1-carboxylate (148 mg, 390 μmol) in THF (1.5 mL) at 0° C. was added in one portion lithium borohydride (21.2 mg, 975 μmol) and the mixture was stirred in an ice-bath for 1.25 hours. The ice-bath was removed and stirring continued at RT for 20 hours. The reaction mixture was poured on saturated aqueous NH4Cl solution and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The organic layers were dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 4 g column using an MPLC system eluting with a gradient of n-heptane:EtOAc (100:0 to 0:100) to yield the desired compound as a colorless oil (0.097 g; 73.7%). MS (ESI): m/z=282.3 [M-C4H8+H]+.
To a solution of tert-butyl (E) and (Z)-4-(3-ethoxy-1-(4-fluorophenyl)-3-oxoprop-1-en-1-yl)piperidine-1-carboxylate (1.74 g, 4.63 mmol) in EtOAc (17.1 mL) was added. Pd/C 10% (175 mg) and the suspension was stirred at RT under an hydrogen atmosphere at 1.5 bar for 4 hours. The reaction mixture was filtered over a microfilter. The compound was purified by silica gel chromatography on a 24 g column using an MPLC system eluting with a gradient of n-heptane:EtOAc (100:0 to 50:50) to get the desired compound as a colorless liquid (1.23 g; 69.8%). MS (ESI): m/z=280 [M-Boc+H]+.
To a solution of ethyl 2-(diethoxyphosphoryl)acetate (2.1 g, 1.86 mL, 9.36 mmol, cas RN 867-13-0) in 1,4-dioxane (9.73 mL) was added dropwise LiHMDS 1.0 M in hexanes (15 mL, 15 mmol) and the solution was stirred for 15 minutes. A solution of tert-butyl 4-(4-fluorobenzoyl)piperidine-1-carboxylate (2.878 g, 9.36 mmol, CAS RN 160296-40-2) in 1,4-dioxane (9.73 mL) was added dropwise to the mixture and stirring was continued at reflux over two days. The reaction mixture was poured on saturated aqueous NH4Cl solution and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The combined organic layers were washed once with H2O, dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 40 g column using an MPLC system eluting with a gradient of n-heptane: EtOAc (100:0 to 50:50) to yield the desired compound as a colorless liquid (1.74 g; 49.4%). MS (ESI): m/z=278.2 [M-Boc+H]+.
To a solution of tert-butyl 4-[(4-fluorophenyl)-methoxy-methyl]piperidine-1-carboxylate (57 mg, 176 μmol) in dioxane (200 μL) was added HCl 4M in dioxane (220 μL, 880 μmol) and the mixture was stirred at RT for 2 hours. The light yellow solution was completely evaporated. The residue was taken up in saturated aqueous NaHCO3 solution and DCM and the layers were separated. The aqueous layer was extracted twice with DCM. The combined organic layers were dried over MgSO4, filtered and evaporated to yield the desired compound as a light yellow oil (0.036 g; 91.5%). MS (ESI): m/z=224.2 [M+H]+.
To an ice-cold solution of tert-butyl 4-((4-fluorophenyl)(hydroxy)methyl)piperidine-1-carboxylate (60 mg, 194 μmol, CAS RN160296-41-3) in THF (1 mL) was added NaH 55% in mineral oil (9.31 mg, 213 μmol) and the mixture was stirred at this temperature for 30 minutes before iodomethane (33.1 mg, 14.6 μL, 233 μmol) was added. After stirring at this temperature for 30 minutes, the turbid solution was allowed to warm up to RT. After stirring for 2 hours at RT another batch of iodomethane (33 mg, 14.6 μL, 233 μmol) was added. After 4.5 hours, the reaction mixture was poured on H2O and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The combined organic layers were dried over MgSO4, filtered and evaporated to get the desired compound as a light yellow oil (0.057 g; 90.9%). MS (ESI): m/z=268.2 [M-C4H8+H]+.
To a solution of tert-butyl 4-(1-methyl-1H-indazol-5-yl)piperidine-1-carboxylate (155 mg, 491 μmol) in dioxane (0.5 mL) was added HCl in 4M in dioxan (614 μL, 2.46 mmol). The colorless suspension was stirred at RT for 3.5 hours. Ether (4 mL) was added and the suspension was filtered. The filter cake was washed with ether to get the desired product as a light yellow solid (0.107 g; 86.5%). MS (ESI): m/z=216.2 [M+−HCl+H]+.
To a solution of tert-butyl 4-(1-methyl-1H-indazol-5-yl)-3,6-dihydropyridine-1(2H)-carboxylate (160 mg, 511 μmol) in MeOH (3 mL) and EtOAc (1 mL) was added under argon Pd—C 10% (16.3 mg, 15.3 μmol) and the suspension was stirred under a hydrogen atmosphere at 1.7 bar for 2.5 hours. The solids were filtered off and the filtrate was evaporated to give the desired compound as a colorless oil (0.156 g; 96.9%). MS (ESI): m/z=316.3 [M+H]+.
To a mixture of tert-butyl 4-(((trifluoromethyl)sulfonyl)oxy)-3,6-dihydropyridine-1(2H)-carboxylate (200 mg, 604 μmol, CAS RN 138647-49-1) in DME (3 mL) and 2M aqueous Na2CO3 (770 μL, 1.54 mmol) were added palladium (II) acetate (2.71 mg, 12.1 μmol), triphenylphosphine (7.92 mg, 30.2 μmol) and 1-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (171 mg, 664 μmol, CAS RN 1235469-00-7) and the clear two-layer mixture was heated to 90° C. for 2 hours. The reaction mixture was poured on H2O and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The combined organic layers were dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 12 g column using an MPLC system eluting with a gradient of n-heptane:EtOAc (100:0 to 00:100) to yield the desired compound as a colorless solid (0.163 g; 86.2%). MS (ESI): m/z=314.3 [M+H]+.
(E or Z)-tert-Butyl 4-[2-cyano-2-phenyl-vinyl]piperazine-1-carboxylate (300 mg, 951 μmol) was treated with a 4 M HCl solution in dioxane (3.6 g, 3 mL, 98.7 mmol). The reaction mixture was stirred at RT for 15 h, then concentrated in vacuo to give a light yellow solid (240 mg, 100%); MS (ESI): m/z=214.2 [M+H]+.
tert-Butyl piperazine-1-carboxylate (200 mg, 1.07 mmol, CAS RN 57260-71-6), 3-oxo-2-phenylpropanenitrile (156 mg, 1.07 mmol, CAS RN 5841-70-3) and sodium triacetoxyborohydride (228 mg, 1.07 mmol, CAS RN 56553-60-7) were dissolved in DCM (5 mL). The reaction mixture was stirred at RT for 48 hours. The reaction mixture was washed with H2O, NaHCO3 and brine. The organic phase was dried over Na2SO4, filtered and the filtrate concentrated in vacuo to give a brown solid (300 mg). MS (ESI); m/z=314.2 [M+H]+.
To a mixture of tert-butyl 4-(5-chloro-1-cyclopropyl-1H-indol-3-yl)piperidine-1-carboxylate (275.0 mg, 0.730 mmol) in EtOAc (5 mL) was added HCl/EtOAc (4M, 4 mL), and the mixture was stirred at 20° C. for 3 hours. The mixture was concentrated and the residue was diluted with H2O (30 mL), washed with EtOAc (10 mL×2). The aqueous layer was lyophilized to afford the title compound as light yellow solid (189.4 mg, 81.3%). 1H NMR (400 MHz, DMSO-d6) δ 9.29-8.87 (m, 2H), 7.76 (d, J=1.9 Hz, 1H), 7.53 (d, J=8.7 Hz, 1H), 7.23-7.10 (m, 2H), 3.38-3.27 (m, 3H), 3.08-2.90 (m, 3H), 2.07-1.98 (m, 2H), 1.98-1.83 (m, 2H), 1.09-1.00 (m, 2H), 0.96-0.88 (m, 2H). MS (ESI): m/z=275.1 [M+H]+.
A mixture of tert-butyl 4-(5-chloro-1H-indol-3-yl)piperidine-1-carboxylate (500 mg, 1.49 mmol), cyclopropylboronic acid (153.92 mg, 1.79 mmol; CAS RN 411235-57-9), 1M NaHMDS solution in THF (3 mL, 2.99 mmol; CAS RN 1070-89-9), DMAP (0.22 mL, 1.79 mmol) and copper(II) acetate (270.22 mg, 1.49 mmol; CAS RN 142-71-2) in toluene (25 mL) were stirred at 95° C. for 12 h (bearing an oxygen balloon). The mixture was poured into H2O (20 mL) and extracted with EtOAc (50 mL×3). The combined organic layers were washed with brine (50 mL), dried over Na2SO4, filtered and concentrated in vacuum. The residue was purified by flash silica gel column chromatography (100-200 mesh) using a gradient of PE:EtOAc (50:1 to 20:1) to afford the title compound as light yellow oil (275 mg, 0.730 mmol, 49.1%). MS (ESI): m/z=275.1 [M-Boc+H]+.
A mixture of tert-butyl 4-(5-chloro-1H-indol-3-yl)-3,6-dihydro-2H-pyridine-1-carboxylate (1.003 g, 3.01 mmol) and platinum(IV) oxide (100.0 mg, 0.350 mmol; CAS RN 1314-15-4) in AcOH (10.0 mL) and EtOH (20 mL) was stirred at 40° C. for 15 h under H2 (1520 mm Hg). The mixture was filtered and the filtrated was concentrated under vacuum. The residue was triturated with PE (50 mL) and filtered. The filter cake was collected and dried under vacuum to afford the title compound as light grey solid (780 mg, 77.3%). MS (ESI): m/z=235.1 [M-Boc+H]+.
To a mixture of 5-chloroindole (1 g, 6.6 mmol; CAS RN 17422-32-1) in MeOH (20 mL) was added tert-butyl 4-oxopiperidine-1-carboxylate (1.97 g, 9.9 mmol; CAS RN 79099-07-3). The mixture was stirred at 20° C. for 1 hours, and then potassium hydroxide (1.48 g, 26.39 mmol) was added. The mixture was stirred at 70° C. for 15 h. The mixture was concentrated under vacuum. The residue was triturated with a mixture of PE and EtOAc (5:1, 50 mL) and filtered. The filter cake was collected and dried under vacuum to afford the title compound as light yellow solid (2 g, 91.3%). MS (ESI): m/z=227.1 [M-C4H8+H]+.
To a mixture of tert-butyl 4-[5-chloro-1-(oxetan-3-yl)-1H-indol-3-yl]piperidine-1-carboxylate (1 g, 2.56 mmol) in DCM (20 mL) was added TFA (5.0 mL). The mixture was stirred at 20° C. for 12 hours. The mixture was concentrated in vacuum, purified by prep-HPLC (0.1% FA in H2O and ACN) to afford the title compound as light yellow solid (311.3 mg, 37.3%). 1H NMR (400 MHz, DMSO-d6) δ 7.76 (d, J=1.8 Hz, 1H), 7.65 (s, 1H), 7.57 (d, J=8.8 Hz, 1H), 7.17 (dd, J=1.9, 8.7 Hz, 1H), 5.73 (quin, J=7.0 Hz, 1H), 5.01 (t, J=7.2 Hz, 2H), 4.90 (t, J=6.5 Hz, 2H), 3.38 (br d, J=12.2 Hz, 2H), 3.14-3.00 (m, 3H), 2.07 (br d, J=13.2 Hz, 2H), 1.96-1.78 (m, 2H). MS (ESI): m/z=291.1 [M+H]+.
To a mixture of tert-butyl 4-(5-chloro-1H-indol-3-yl)piperidine-1-carboxylate (1 g, 2.99 mmol, BB9, intermediate step b) in DMF (20 mL) was added NaH 60% in mineral oil (143.35 mg, 3.58 mmol) at 0° C. The mixture was stirred at 20° C. for 1 hour, and then oxetan-3-yl 4-methylbenzenesulfonate (1022.55 mg, 4.48 mmol; CAS RN 26156-48-9) was added and the mixture was stirred at 85° C. for 12 hours. The mixture was poured into H2O (60 mL) and extracted with EtOAc (50 mL×3). The combined organic layers were washed with brine (50 mL), dried over Na2SO4 and concentrated over vacuum to afford the title compound as light yellow solid (1.1 g, 2.81 mmol, 94.2%). MS (ESI): m/z=291.1 [M-Boc+H]+.
To a solution of 4-[bis(4-Fluorophenyl)methylene]piperidine (700.0 mg, 1.75 mmol) in AcOH (50.0 mL) was added Pd/C (1.0 g), the reaction was purged with hydrogen for three times and stirred at 90° C. (under hydrogen balloon) for 48 hours. The reaction mixture was filtered and concentrated in vacuum. The crude product was purified by prep-HPLC (0.1% FA in water and MeCN) to afford the title compound as a light grey solid (263.5 mg, 32.1%). 1H NMR (DMSO-d6, 400 MHz,) δ 8.39 (s, 1H), 7.45-7.37 (m, 4H), 7.15-7.07 (m, 4H), 3.68 (d, J=11.2 Hz, 1H), 3.17 (br d, J=12.3 Hz, 2H), 2.80-2.68 (m, 1H), 2.46 (br d, J=11.2 Hz, 1H), 1.54-1.32 (m, 2H), 1.27-1.09 (m, 2H). MS (ESI): m/z=288.1 [M+H]+.
To a solution of bis(4-fluorophenyl)(piperidin-4-yl)methanol (900.0 mg, 2.59 mmol) in DCM (30 mL) was added TFA (10.0 mL) and the reaction mixture was stirred at 20° C. for 12 hours. The reaction mixture was concentrated in vacuum to afford the crude title compound which was used in the next step without further purification. MS (ESI): m/z=286.1 [M+H]+.
A mixture of Mg (1.4 g, 58.29 mmol) and 12 (20.0 mg, 0.080 mmol) were suspended in THF (40 mL) at 10° C. To the above yellow solution was added 1-bromo-4-fluoro benzene (1.0 g, 5.75 mmol, CAS RN 460-00-4), and the reaction mixture was heated to 45° C. until the solution became clear. Another batch of 1-bromo-4-fluoro benzene (9.14 g, 52.54 mmol, CAS RN 460-00-4) (dissolved in 10 mL of THF) was added in. The reaction mixture was stirred at 45° C. for 30 mins. Ethyl N-BOC-piperidine-4-carboxylate (1.5 g, 5.83 mmol, CAS RN 142851-03-4) was added and the reaction mixture was stirred at 80° C. for 12 hours. The mixture was poured into sat. NH4Cl aq. solution (50 mL), the mixture was extracted twice with EtOAc (50 mL each), the combined organic layer was washed with water (30 mL×2) and brine (30 mL), dried over Na2SO4 and concentrated in vacuum to afford the title compound (900 mg, 38.2%). 1H NMR (400 MHz, DMSO-d6) δ 8.70 (br s, 1H), 7.57-7.47 (m, 4H), 7.12 (t, J=8.8 Hz, 4H), 5.73 (s, 1H), 3.23 (br d, J=12.3 Hz, 2H), 2.92-2.79 (m, 3H), 1.68-1.54 (m, 2H), 1.39 (br d, J=13.6 Hz, 2H). MS (ESI): m/z=304.1 [M+H]+.
To a solution of tert-butyl 4-[5-chloro-1-(oxetan-3-ylmethyl)indol-3-yl]piperidine-1-carboxylate (700.0 mg, 1.73 mmol) in DCM (20 mL) was added TFA (3.38 mL). The mixture was stirred at 20° C. for 12 h. The mixture was concentrated under vacuum, purified by prep-HPLC (0.1% FA in H2O and ACN) to afford the title compound as light yellow solid (154.57 mg, 29.0%). 1H NMR (400 MHz, DMSO-d6) δ 8.60 (br s, 1H), 7.71 (d, J=1.7 Hz, 1H), 7.54 (d, J=8.8 Hz, 1H), 7.33 (s, 1H), 7.13 (dd, J=1.8, 8.7 Hz, 1H), 4.59 (dd, J=6.2, 7.6 Hz, 2H), 4.47-4.33 (m, 4H), 3.43-3.37 (m, 3H), 3.08-2.99 (m, 3H), 2.04 (d, J=13.0 Hz, 2H), 1.89-1.76 (m, 2H). MS (ESI): m/z=305.2 [M+H]+.
To a solution of tert-butyl 4-(5-chloro-1H-indol-3-yl)piperidine-1-carboxylate (400.0 mg, 1.19 mmol, BB9, intermediate step b) in DMF (8 mL) was added NaH 60% in mineral oil (57.34 mg, 2.39 mmol) at 0° C. The mixture was stirred at 20° C. for 1 hour. Then oxetan-3-ylmethyl 4-methylbenzenesulfonate (434.16 mg, 1.79 mmol) was added and the mixture was stirred at 85° C. for 12 hours. The mixture was poured into H2O (60 mL) and extracted with EtOAc (50 mL×3). The combined organic layers were washed with brine (50 mL), dried over Na2SO4 and concentrated in vacuum to afford the title compound as yellow oil (629 mg, crude). MS (ESI): m/z=305.0 [M-Boc+H]+.
To a solution of 3-oxetanemethanol (500.0 mg, 5.67 mmol; CAS RN 6246-06-6) in DCM (10 mL) was added TEA (1.19 mL, 8.51 mmol), DMAP (69.33 mg, 0.570 mmol) and 4-methylbenzene-1-sulfonyl chloride (1293.77 mg, 6.81 mmol; CAS RN 98-59-9). The mixture was stirred at 20° C. for 6 hours. The mixture was diluted with a mixture of EtOAc and saturated aqueous NH4Cl solution (1:1, 20 mL). The mixture was extracted with EtOAc (40 mL×3). The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated to afford the title compound as brown solid (1.25 g, 5.16 mmol, 78.7%). MS (ESI): m/z=243.1 [M+H]+.
To a solution of 2-[5-chloro-3-(4-piperidyl)indol-1-yl]ethanol (600.0 mg, 1.39 mmol) in pyridine (5 mL) was added t-butyldimethylchlorosilane (251.35 mg, 1.67 mmol; CAS RN 18162-48-6) and the mixture was stirred at 20° C. for 12 hours. The mixture was poured into H2O (10 mL) and extracted with EtOAc (20 mL×3). The combined organic layers were washed with brine (10 mL), dried over Na2SO4, filtered and concentrated. The residue was triturated with PE (10 mL) and filtered. The filter cake was washed with PE (5 mL×2 the solid collected and dried in vacuum to afford the title compound as light yellow solid (164.7 mg, 29.8%). 1H NMR (400 MHz, DMSO-d6) δ 8.97 (br s, 1H), 7.72 (d, J=2.0 Hz, 1H), 7.47 (d, J=8.7 Hz, 1H), 7.20 (s, 1H), 7.10 (dd, J=1.8, 8.7 Hz, 1H), 4.22 (br t, J=4.8 Hz, 2H), 3.84 (t, J=4.9 Hz, 2H), 3.44-3.32 (m, 2H), 3.12-2.94 (m, 3H), 2.08-1.96 (m, 2H), 1.95-1.81 (m, 2H), 0.73 (s, 9H), −0.24 (s, 6H). MS (ESI): m/z=393.1 [M+H]+.
To a mixture of tert-butyl 4-[5-chloro-1-(2-hydroxyethyl)indol-3-yl]piperidine-1-carboxylate (1.1 g, 2.9 mmol) in EtOAc (10 mL) was added HCl/ETOAC (4M, 0.73 mL). The mixture was stirred at 20° C. for 3 hours and then concentrated in vacuum. The residue was diluted with DCM (20 mL) and washed with saturated aqueous NaHCO3 solution (10 mL). The aqueous layer was extracted with DCM:MeOH (5:1 v/v; 20 mL×3). The combined organic layers were dried over Na2SO4 and filtered. The filtrate was concentrated in vacuum to afford the title compound as light yellow oil (750 mg, 59.8%). MS (ESI): m/z=279.1 [M+H]+.
A mixture of tert-butyl 4-(5-chloro-1H-indol-3-yl)piperidine-1-carboxylate (1 g, 2.99 mmol, intermediate BB9, step b), 2-bromoethanol (0.32 mL, 4.48 mmol; CAS RN 540-51-2) and potassium hydroxide (335.12 mg, 5.97 mmol) in DMF (10 mL) was stirred at 100° C. for 12 hours. The mixture was purified by prep-HPLC (0.1% ammonia in H2O and ACN) to afford the title compound as light yellow oil (1.1 g, 97.2%). MS (ESI): m/z=323.1 [M-C4H8+H]+.
and
The enantiomers of rac-(4aR,8aS)-hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one dihydrochloride (500 mg, 2.18 mmol, ChemBridge Corporation) were separated by preparative chiral HPLC (ReprosilChiral NR column) using an isocratic mixture of EtOH (containing 0.05% of NH4OAc):n-heptane (30:70).
First eluting enantiomer: (+)-cis-4a,5,6,7,8,8a-Hexahydro-4H-pyrido[4,3-b][1,4]oxazin-3-one. Yellow solid (0.150 g; 44.0%). MS (ESI): m/z=157.1 [M+H]+.
Second eluting enantiomer: (−)-cis-4a,5,6,7,8,8a-Hexahydro-4H-pyrido[4,3-b][1,4]oxazin-3-one. Yellow solid (0.152 g; 44.6%). MS (ESI): m/z=157.1 [M+H]+.
To a suspension of rac-(4aR,8aS)-hexahydro-2H-pyrido[4,3-b][1,4]oxazin-3(4H)-one; dihydrochloride salt (4.5 g, 19.6 mmol, BB1) in dry DCM (125 mL) at 0° C. was added DIPEA (6.35 g, 8.58 mL, 49.1 mmol) followed by 4-nitrophenyl carbonochloridate (4.35 g, 21.6 mmol). The reaction mixture was stirred at 0° C. for 10 min and at RT for 2 h. The crude reaction was diluted with DCM and transferred into a separating funnel for extraction with sat. aq. Na2CO3 solution. The organic phase was collected and the aqueous phase was back-extracted with DCM. The combined organic phases were dried over Na2SO4 and evaporated down to dryness to yield 6.62 g of a crude racemic product (BB7) as a yellow solid. The crude material was directly submitted for a chiral SFC separation to yield enantiomer BB15b (2.72 g, second eluting enantiomer) as a yellow solid and enantiomer BB15a (3.25 g, first eluting enantiomer) as a light beige solid but contaminated with BB15b. A further SFC chiral separation was carried out to yield 2.71 g of BB15a. MS (ESI): m/z=322.2 [M+H]+ for both enantiomers.
A solution of tert-butyl 4-(1-(4-fluorophenyl)-3-hydroxypropyl)piperidine-1-carboxylate (119 mg, 353 μmol, BB5, intermediate b) in HCl 2M in diethyl ether (1.76 mL, 3.52 mmol) was stirred at RT for 4.5 h before another batch of HCl 2M in diethyl ether (1.76 mL, 3.53 mmol) was added. Stirring was continued at RT overnight. The suspension was homogenized in an ice-cold ultrasonic and filtered. The filter cake was washed with a small volume of diethyl ether to get the desired compound as a colorless solid (0.067 g; 69.4%). MS (ESI): m/z=238.2 [M+H]+.
A solution of tert-butyl 4-[1-[4-(trifluoromethyl)phenyl]ethyl]piperidine-1-carboxylate (1.5 g, 4.2 mmol) in a mixture of HCl/dioxane (50.0 mL, 1/1 v/v) was stirred at 20° C. for 2 h. The mixture was concentrated and the residue was purified by prep-HPLC (FA) and lyophilized to get the desired compound as light yellow oil (838.4 mg, 77.1%). MS (ESI): m/z=258.1 [M+H]+.
To a solution of tert-butyl 4-[1-[4-(trifluoromethyl)phenyl]vinyl]piperidine-1-carboxylate (2.0 g, 5.63 mmol) in EtOAc (100 mL) was added Pd/C (1.0 g, 5.63 mmol), the mixture was stirred at 20° C. under H2 atmosphere (balloon) for 12 h. The mixture was filtered and the filtrate was concentrated to get the desired compound as a colorless oil (1.8 g, 89.5%). MS (ESI): m/z=302.2 [M-C4H8+H]+.
To a solution of methyltriphenylphosphonium bromide (10.0 g, 27.98 mmol, CAS RN 1779-49-3) in THF (250 mL) was added lithium bis(trimethylsilyl)amide in THF (41.97 mL, 41.97 mmol) dropwise at 0° C. and the mixture was stirred at 0° C. for h. Then tert-butyl 4-[4-(trifluoromethyl)benzoyl]piperidine-1-carboxylate (10.0 g, 27.98 mmol, CAS RN 725229-27-6) in THF (50 mL) was added dropwise and the mixture was allowed to warm to 20° C. over 2 h. The mixture was poured into aq. NH4Cl solution (500 mL) and extracted three times with EtOAc (200 mL each). The organic phase was washed with brine and dried over Na2SO4, filtered and the filtrate was purified by silica gel column (PE:EtOAc=20:1) to provide the desired compound as light yellow oil. (5.1 g, 51.3%). 1H NMR (400 MHz, CHLOROFORM-d) δ=7.61 (d, J=8.2 Hz, 2H), 7.44 (d, J=8.1 Hz, 2H), 5.25 (s, 1H), 5.13 (s, 1H), 4.27-4.14 (m, 2H), 2.77 (br t, J=12.3 Hz, 2H), 2.58 (br t, J=11.6 Hz, 1H), 1.78 (br d, J=13.0 Hz, 2H), 1.48 (s, 9H), 1.43-1.32 (m, 2H).
A mixture of 1-[4-(6-chloro-1-methyl-indazol-3-yl)-1-piperidyl]ethanone (3.95 g, 14 mmol) was refluxed in aqueous 25% HCl solution (25.75 mL) for 4 h. After cooling down to RT the mixture was basified using concentrated aqueous NaOH solution. The aqueous layer was extracted twice with DCM. The organic layers were dried over Na2SO4, filtered and evaporated to get the desired compound as a light red oil (3.6 g, 98.2%). MS (ESI): m/z=250.2 [M+H]+. The compound was used in the next step without further purification.
In a sealed tube were mixed 1-[4-(4-chloro-2-fluoro-benzoyl)-1-piperidyl]ethanone (3.9 g, 14 mmol; Novel Chemical Solutions) and methylhydrazine (0.94 mL, 18 mmol) and the mixture was heated at 120° C. for 16 h. After cooling down the mixture was basified using concentrated aqueous NaHCO3 solution. The aqueous layer was extracted twice with DCM. The organic layers were dried over Na2SO4, filtered and evaporated to provide the desired compound as a yellow oil (3.97 g, 100%). MS (ESI): m/z=292.3 [M+H]+. The compound was used in the next step without further purification.
The product was obtained in analogy to BB16 from tert-butyl 4-(cyano(4-fluorophenyl)methyl)piperidine-1-carboxylate (MFCD28112711, A Chemtek) as a light yellow solid. (0.101 g; 87.1%). MS (ESI): m/z=219.1 [M+H]+.
The product was obtained in analogy to BB16 from tert-butyl 4-((4-fluorophenyl)(2,2,2-trifluoroethoxy)methyl)piperidine-1-carboxylate as a colorless foam (0.151 g; 100.0%). MS (ESI): m/z=292.2 [M+H]+.
To a yellow solution of tri-n-butylphosphine (262 mg, 319 μL, 1.29 mmol) and azodicarboxylic dipiperidide (326 mg, 1.29 mmol) in toluene (10 mL) was added tert-butyl 4-((4-fluorophenyl)(hydroxy)methyl)piperidine-1-carboxylate (200 mg, 646 μmol, CAS RN 160296-41-3) and the mixture was stirred at RT for 10 min. Addition of 2,2,2-trifluoroethanol (711 mg, 514 μL, 7.11 mmol) gave a suspension. After heating at reflux for 20 h, the reaction mixture was cooled down to RT. Silica gel was added and the mixture was evaporated. The compound was purified by silica gel chromatography on a 12 g column using an MPLC (ISCO) system eluting with a gradient of n-heptane:EtOAc (100:0 to 50:50) to get the desired compound as a colorless oil (0.180 g; 71.1%). MS (ESI): m/z=391.1 [M+H]+.
The product was obtained in analogy to BB16 from tert-butyl 4-(1-(4-fluorophenyl)-2-(3-methyl-1,2,4-oxadiazol-5-yl)ethyl)piperidine-1-carboxylate as a colorless solid (0.051 g; 98.3%). MS (ESI): m/z=290.2 [M+H]+.
To a mixture of tert-butyl 4-(3-ethoxy-1-(4-fluorophenyl)-3-oxopropyl)piperidine-1-carboxylate (100 mg, 264 μmol) and (Z)—N′-hydroxyacetimidamide (39 mg, 527 μmol) in toluene (2.5 mL) was added K2CO3 (72.8 mg, 527 μmol) and the reaction mixture stirred at 130° C. for 14 days. Reaction was not finished so (Z)—N′-hydroxyacetimidamide (39 mg, 527 μmol) and K2CO3 (72.8 mg, 527 μmol) were added and the RM stirred over the weekend at 130° C. The reaction mixture was poured on saturated aqueous NH4Cl solution and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The organic layers were dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 4 g column using an MPLC system eluting with a gradient of n-heptane:EtOAc (100:0 to 0:100) to get the desired compound as a colorless solid. MS (ESI): m/z=290.3 [M-Boc+H]+.
In a 25 mL round-bottomed flask, tert-butyl (E)-4-(3-ethoxy-1-(4-fluorophenyl)-3-oxoprop-1-en-1-yl)piperidine-1-carboxylate (1.747 g, 4.63 mmol) was combined with EtOAc (17.1 mL) to give a colorless solution. Pd/C 10% (175 mg, 4.63 mmol) was added added under argon. The suspension was stirred under an hydrogen atmosphere at 1.5 bar for 4 h. The reaction mixture was filtered and the filtrate was concentrated in vacuo. The compound was purified by silica gel chromatography on a 24 g column using an MPLC (ISCO) system eluting with a gradient of n-heptane:EtOAc (100:0 to 50:50) to get the desired compound as a colorless oil (1.22 g; 69.8%). MS (ESI): m/z=280 [M-Boc+H]+.
To a solution of ethyl 2-(diethoxyphosphoryl)acetate (2.1 g, 1.86 mL, 9.36 mmol) in 1,4-dioxane (9.73 mL) was added dropwise LiHMDS 1.0 M in hexanes (15 mL, 15 mmol) and the solution was stirred for 15 min. tert-Butyl 4-(4-fluorobenzoyl)piperidine-1-carboxylate (2.878 g, 9.36 mmol, CAS RN 160296-40-2) dissolved in 1,4-dioxane (9.73 mL) was added dropwise to the mixture and stirring was continued at reflux over two days. The reaction mixture was poured on saturated aqueous NH4Cl solution and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The organic layers were washed once with water, dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 40 g column using an MPLC system eluting with a gradient of n-heptane:EtOAc (100:0 to 50:50) to get the desired compound as a colorless liquid (1.74 g, 49.4%). MS (ESI): m/z=278.2 [M-Boc+H]+.
To a solution of tert-butyl 4-[1-[4-(trifluoromethyl)phenyl]cyclopropyl]piperidine-1-carboxylate (250.0 mg, 0.680 mmol) in DCM (5 mL) was added TFA (1.0 mL, 0.680 mmol) and the mixture was stirred at 20° C. for 16 h. The mixture was concentrated and the residue was purified by prep-HPLC (FA) to yield the desired compound as a yellow oil (181 mg, 81.5%). MS (ESI): m/z=270.1 [M+H]+.
To a solution of tert-butyl 4-[2,2-dibromo-1-[4-(trifluoromethyl)phenyl]cyclopropyl]piperidine-1-carboxylate (800.0 mg, 1.52 mmol) and titanium(IV) isopropoxide (862.56 mg, 3.03 mmol) in THF (30 mL) was added a 3M solution of EtMgBr in THF (5.06 mL, 15.17 mmol) dropwise at 0° C. The mixture was warmed to 20° C. over 16 h. The mixture was poured into NH4Cl (aq. 100 mL) and extracted three times with EtOAc (30 mL each). The organic phase was washed with brine and dried over Na2SO4, filtered and the filtrate was concentrated. The residue was purified by reversed flash chromatography (FA) to provide the desired compound as a light yellow oil (250 mg, 44.6%). MS (ESI): m/z=314.1 [M-C4H8+H]+.
To a vigorously stirred mixture of tert-butyl 4-[1-[4-(trifluoromethyl)phenyl]vinyl]piperidine-1-carboxylate (1.2 g, 3.38 mmol, BB17, intermediate b), bromoform (2.56 g, 10.13 mmol, CAS RN 75-25-2) and cetrimide (0.37 g, 1.01 mmol, CAS RN 57-09-0) in DCM (10 mL) was added 50% of aq. NaOH (1.35 mL, 16.88 mmol) dropwise. The reaction mixture was vigorously stirred at 50° C. for 16 h, and then H2O (20 mL) was added. The organic phase was separated the aqueous phase was extracted three times with with DCM (10 mL each). The combined organic phases were washed with H2O, 2% HCl and brine, and dried (Na2SO4), filtered, and concentrated. The residue was purified by prep-TLC (PE:EtOAc=20:1) to give the desired compound as colorless oil (900 mg, 50.5%). MS (ESI): m/z=471.9 [M-C4H8+H]+.
The product was obtained in analogy to BB16 from tert-butyl 4-(1-(4-fluorophenyl)-2-(2,2,2-trifluoroethoxy)ethyl)piperidine-1-carboxylate as a colorless foam (0.173 g; 97.7%). MS (ESI): m/z=306.2 [M+H]+.
To a yellow solution of tri-n-butylphosphine (273 mg, 333 μL, 1.35 mmol) and azodicarboxylic dipiperidide (340 mg, 1.35 mmol) in Toluene (11.1 mL) was added tert-butyl 4-(1-(4-fluorophenyl)-2-hydroxyethyl)piperidine-1-carboxylate (218 mg, 674 μmol, BB5, intermediate b) and the mixture was stirred at RT for 10 minutes. Addition of 2,2,2-trifluoroethanol (742 mg, 536 μL, 7.42 mmol) gave a suspension. Upon heating to 65° C. again a yellow solution was formed. After heating at reflux for 17 hours, the reaction mixture was cooled down to RT. Silica gel was added and the mixture was evaporated. The compound was purified by silica gel chromatography on a 12 g column using an MPLC (ISCO) system eluting with a gradient of n-heptane:EtOAc (100:0 to 50:50) to get the desired compound as a colorless oil (0.211 g; 77.2%). MS (ESI): m/z=350.1 [M-C4H8+H]+.
The product was obtained in analogy to BB22 from tert-butyl 3-[1-[4-(trifluoromethyl)phenyl]ethyl]azetidine-1-carboxylate as light yellow oil (151.5 mg, 27.4%). MS (ESI): m/z=230.1 [M+H]+.
The product was obtained in analogy to BB17, intermediate a from tert-butyl 3-[1-[4-(trifluoromethyl)phenyl]vinyl]azetidine-1-carboxylate as colorless oil (1 g, 99.4%). MS (ESI): m/z=274.0 [M-C4H8+H]+.
To a solution of methyltriphenylphosphonium bromide (1952.56 mg, 5.47 mmol, CAS RN 1779-49-3) in THF (25 mL) was added lithium bis(trimethylsilyl)amide/THF (9.11 mL, 9.11 mmol) dropwise at 0° C., the mixture was stirred at 0° C. for 1 h, then tert-butyl 3-[4-(trifluoromethyl)benzoyl]azetidine-1-carboxylate (1500.0 mg, 4.55 mmol, MFCD24368873, FCH group) in THF (5 mL) was added dropwise, the mixture was warmed to 20° C. for 2 h. The mixture was poured into aq. NH4Cl solution (100 mL) and extracted three times with EtOAc (50 mL each), the organic phase was washed with brine and dried over Na2SO4, filtered and the filtrate was purified by silica gel column (PE:EtOAc=20:1) to give the desired compound as light yellow oil (1000 mg, 67.0%). 1H NMR (400 MHz, CHLOROFORM-d) δ=7.61 (d, J=8.1 Hz, 2H), 7.42 (d, J=8.1 Hz, 2H), 5.61 (s, 1H), 5.32 (s, 1H), 4.20 (t, J=8.4 Hz, 2H), 3.89 (br s, 2H), 3.83-3.73 (m, 1H), 1.46 (s, 9H).
The product was obtained in analogy to BB16 from tert-butyl 4-((4-fluorophenyl)(3-(trifluoromethyl)-1,2,4-oxadiazol-5-yl)methyl)piperidine-1-carboxylate as a colorless solid (0.119 g; 90.1%). MS (ESI): m/z=330.2 [M+H]+.
To a solution of 2-(1-(tert-butoxycarbonyl)piperidin-4-yl)-2-(4-fluorophenyl)acetic acid (250 mg, 741 μmol, MFCD17214722, A Chemtek) in DMF (2 mL) was added CDI (120 mg, 741 μmol) and the mixture was stirred at RT for 30 minutes. To the clear solution was added a solution of (Z)-2,2,2-trifluoro-N′-hydroxyacetimidamide (94.9 mg, 741 μmol) in DMF (0.5 mL) and stirring was continued at R for 1 hour. The reaction mixture was heated in a microwave at 120° C. for 30 minutes followed by heating at 150° C. for 30 minutes. The reaction mixture was poured on water and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The organic layers were washed twice with water, dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 12 g column using an MPLC system eluting with a gradient of n-heptane:EtOAc (100:0 to 0:100) to provide the desired compound as a colorless foam (0.155 g; 48.7%). MS (ESI): m/z=428.3 [M−H]−.
The product was obtained in analogy to method A4 using 3-[(4-fluorophenyl)-(2,2,2-trifluoroethoxy)methyl]azetidine 2,2,2-trifluoroacetate to get the desired product as white solid. MS (ESI): m/z=446.2 [M-C4H8+H]+. The product was used in the next step without further purification.
To a solution of tert-butyl 3-[(4-fluorophenyl)-(2,2,2-trifluoroethoxy)methyl]azetidine-1-carboxylate (1000.0 mg, 2.75 mmol) in DCM (20 mL) was added TFA (2.0 mL, 2.75 mmol), the mixture was stirred at 20° C. for 12 h. The mixture was concentrated, the residue was purified by prep-HPLC (TFA) to get the desired product as off-white solid (608.8 mg, 57.6%). MS (ESI): m/z=264.1 [M+H]+.
To a solution of tert-butyl 3-[(4-fluorophenyl)-hydroxy-methyl]azetidine-1-carboxylate (3000.0 mg, 10.66 mmol), 2,2,2-trifluoroethanol (1.55 mL, 21.33 mmol) and triphenylphosphine (4195.52 mg, 16 mmol) in THF (50 mL) was added diisopropyl azodicarboxylate (3.15 mL, 16 mmol) and the mixture was stirred at 80° C. for 12 h. The mixture was concentrated and the residue was purified by reversed flash (FA) to give the desired product as yellow oil (1 g, 25.8%). MS (ESI): m/z=308.1 [M-C4H8+H]+.
To a solution of tert-butyl 3-(4-fluorobenzoyl)azetidine-1-carboxylate (2 g, 7.16 mmol, MFCD24368873, FCH group) in MeOH (30 mL) was added NaBH4 (541.33 mg, 14.32 mmol) and the mixture was stirred at 20° C. for 1 h. The mixture was concentrated and dissolved in EtOAc (100 mL), washed with a.q NH4Cl and brine, dried over Na2SO4 and concentrated to give the desired product as light yellow oil (2 mg, 99.3%). The compound was used in the next step without any further purification.
The product was obtained in analogy to method A4 using 3-[1-(2-chloro-4-fluoro-phenyl)ethoxy]azetidine 2,2,2-trifluoroacetate to give the desired product as off-white solid (230 mg, 59.8%). MS (ESI): m/z=412.2 [M+H]+.
The product was obtained in analogy to BB26, intermediate a using tert-butyl 3-[1-(2-chloro-4-fluoro-phenyl)ethoxy]azetidine-1-carboxylate to give the desired product as light yellow gum (1.4 g, 67.2%). MS (ESI): m/z=230.1 [M+H]+.
A mixture of tert-butyl 3-hydroxyazetidine-1-carboxylate (5.34 g, 30.82 mmol, CAS RN 141699-55-0) in DMF (60 mL) was added sodium hydride (1.54 g, 38.53 mmol) at 0° C. The mixture was stirred at 20° C. for 1 h. Then 1-(1-bromoethyl)-2-chloro-4-fluoro-benzene (6.1 g, 25.68 mmol, CAS RN 1341821-29-1) was added and the mixture was stirred at 20° C. for 12 h. The mixture was poured into ice water (200 mL) and extracted three times with EtOAc (100 mL each). The combined organic layer was washed with brine (100 mL), dried over Na2SO4 and filtered. The filtrate was concentrated. The residue was purified by prep-HPLC (FA) and concentrated under vacuum to give the desired product as light yellow oil (2 g, 23.6%). MS (ESI): m/z=230 [M+H-Boc]+.
To an solution of tert-butyl 3-(2-chloro-[1,1′-biphenyl]-4-yl)azetidine-1-carboxylate (60 mg, 174 μmol) in EtOAc (2 mL) was added 4-methylbenzenesulfonic acid hydrate (39.8 mg, 209 μmol) and the mixture was heated at reflux for 1 hour. The clear, colorless solution was evaporated to get the desired product as a colorless solid (0.10 g; 100%). MS (ESI): m/z=244.2 [M+H]+.
The product was obtained in analogy to Method A5 from phenylboronic acid (CAS RN 98-80-6) and tert-butyl 3-(4-bromo-3-chlorophenyl)azetidine-1-carboxylate (CAS RN 2222937-56-4 as a colorless solid. MS (ESI): m/z=288.2 [M-C4H8+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(4-bromo-3-chlorophenyl)azetidine-1-carboxylate (CAS RN 2222937-56-4) as a colorless solid. MS (ESI): 248.1 [M+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(3-bromophenyl)azetidine-1-carboxylate (CAS RN 1203681-54-2) as a colorless solid. MS (ESI): 212.1 [M+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(4-(tert-butyl)phenyl)azetidine-1-carboxylate (CAS RN 1629889-13-9) as a colorless solid. MS (ESI): 190.2 [M+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(6-chloropyridin-3-yl)azetidine-1-carboxylate (CAS RN 870689-19-3) as a colorless solid. MS (ESI): 169.1 [M+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(4-(trifluoromethyl)phenyl)azetidine-1-carboxylate (CAS RN 1638255-66-9) as a colorless solid. MS (ESI): 202.2 [M+H]+.
To a solution of 1-benzhydryl-3-((1,1,1-trifluoro-2-methylpropan-2-yl)oxy)azetidine (114 mg, 326 μmol) in Ethanol (0.5 mL) and EtOAc (0.5 mL) were added HCl 1M in H2O (326 μL, 326 μmol) and Pd/C 10% (20 mg, 326 μmol) and the mixture was stirred under a hydrogen atmosphere at 1.7 bar for 5 h. The suspension was filtered over a microfilter and the filtrate was evaporated to get the desired compound as a colorless amorphous (0.105 g). MS (ESI): m/z=184.2 [M+H]+. Used without further purification in the next step.
To a solution of 1,1,1-trifluoro-2-methyl-propan-2-ol (807 mg, 690 μL, 6.3 mmol, CAS RN 507-52-8) in DMF (5 mL) under argon was added sodium hydride 60% in mineral oil (252 mg, 6.3 mmol) and the mixture was stirred at RT for 30 minutes. After addition of (1-benzhydrylazetidin-3-yl) methanesulfonate (1 g, 3.15 mmol, CAS RN 33301-41-6) the reaction mixture was heated in a microwave oven at 130° C. for 60 minutes. The reaction mixture was poured on water and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The organic layers were washed once with water, dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 12 g column using an MPLC system eluting with a gradient of n-heptane:EtOAc (100:0 to 50:50) to yield the desired compound as a yellow solid (0.324 g; 29.4%). MS (ESI): m/z=350.3 [M+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(4-(1,1-difluoroethyl)phenyl)azetidine-1-carboxylate as a colorless solid (0.050 g; 35.9%). MS (ESI): m/z=198.2 [M+H]+.
To a stirred suspension of 2-(4-(1,1-difluoroethyl)phenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (568 mg, 2.12 mmol, CAS RN 1000994-94-4) in 2-propanol (1.5 mL) was added a solution of tert-butyl 3-iodoazetidine-1-carboxylate (300 mg, 1.06 mmol, CAS RN 254454-54-1) in 2-propanol (1.5 mL) at RT, to give a solution. To the mixture was added rac-(1R,2R)-2-aminocyclohexan-1-ol (7.32 mg, 63.6 μmol, CAS RN 13374-31-7), nickel(II) iodide (19.9 mg, 63.6 μmol) and sodium bis(trimethylsilyl)amide (1.06 mL, 2.12 mmol) under argon. The mixture was heated in a microwave oven for 30 minutes at 100° C. The reaction mixture was poured on water and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The organic layers were dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 4 g column using an MPLC system eluting with a gradient of n-heptane:EtOAc (100:0 to 70:30) to furnish the desired compound as a colorless oil (0.0112 g; 35.5%). MS (ESI): m/z=242.2 [M-C4H8+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(4-(1-methyl-1H-pyrazol-5-yl)phenyl)azetidine-1-carboxylate as a light brown gum which was used in the. MS (ESI): m/z=214.1 [M+H]+. The product was used in the next step without further purification.
The product was obtained in analogy to BB35, intermediate from (4-(1-methyl-1H-pyrazol-5-yl)phenyl)boronic acid (CAS RN 1487353-57-0) as a light brown gum. MS (ESI): m/z=314.3 [M+H]+. The product was used in the next step without further purification.
The product was obtained in analogy to BB26, intermediate a, from tert-butyl 3-[4-(2,2,2-trifluoroethoxy)phenyl]azetidine-1-carboxylate as alight yellow oil. MS (ESI): m/z=232.1 [M+H]+. The product was used in the next step without further purification.
To a solution of 1-bromo-4-(2,2,2-trifluoroethoxy)benzene (0.45 g, 1.77 mmol, CAS RN 106854-77-7), 1-BOC-3-iodoazetidine (0.5 g, 1.77 mmol, CAS RN 254454-54-1), 1,10-phenanthroline (63.65 mg, 0.350 mmol, CAS RN 5144-89-8), NaBF4 (96.95 mg, 0.880 mmol, CAS RN 13755-29-8), NiCl2 glyme (38.8 mg, 0.180 mmol, CAS RN 29046-78-4) and Mn powder (194.06 mg, 3.53 mmol) in MeOH (10 mL) was added 4-ethylpyridine (94.62 mg, 0.880 mmol, CAS RN 536-75-4). The mixture was stirred at 60° C. under N2 atmosphere for 16 h. The mixture was filtered and the filtrate was concentrated, the residue was purified by reverse flash chromatography (FA) to get the desired product as light yellow foam (60 mg, 10.2%). MS (ESI): m/z=276.0 [M-C4H8+H]+.
To a solution of (4aR,8aS)-6-[3-(4-bromophenyl)azetidine-1-carbonyl]-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazin-3-one (300.0 mg, 0.760 mmol, example 110) and PdCl2(dppf).CH2Cl2 (53.34 mg, 0.080 mmol) was added potassium acetate (224.04 mg, 2.28 mmol) and bis(pinacolato)diboron (289.84 mg, 1.14 mmol, CAS RN 73183-34-3), the reaction was purged with nitrogen and stirred at 90° C. for 12 h. The reaction was diluted with water and extracted with EtOAc for three times, the combined organic layer was washed with water and brine, dried over sodium sulfate and concentrated in vacuum to get yellow residue, which was purified with reverse phase chromatograph (FA) to get the desired product as light yellow solid (230 mg, 84.1%). MS (ESI): m/z=360.5 [M+H]+.
The product was obtained in analogy to BB16 from tert-butyl 4-((3-cyclopropyl-1,2,4-oxadiazol-5-yl)(4-fluorophenyl)methyl)piperidine-1-carboxylate as a colorless foam (0.170 g; 84.7%). MS (ESI): m/z=302.3 [M+H]+.
The product was obtained in analogy to BB25, intermediate from 2-(1-(tert-butoxycarbonyl)piperidin-4-yl)-2-(4-fluorophenyl)acetic acid and N′-hydroxycyclopropanecarboxamidine as a colorless foam (0.240 g; 80.7%). MS (ESI): m/z=346.2 [M-C4H8+H]+.
To a turbid solution of 2-(4-fluorophenyl)-2-(piperidin-4-yl)acetic acid hydrobromide (535 mg, 1.55 mmol) in NaOH 1M in H2O (3.09 mL, 3.09 mmol) was added dropwise a solution of di-tert-butyl dicarbonate (368 mg, 391 μL, 1.68 mmol) in DME (5 mL) and the mixture was stirred at RT for 3 h. DME was evaporated. The residue was taken up in approx. 1.2 mL citric acid 10% in water (pH approx. 4) and EtOAc and the layers were separated. The aqueous layer was extracted once with EtOAc. The organic layers dried over MgSO4, filtered and evaporated to get the desired compound as a light brown solid (0.520 g; 99.6%). MS (ESI): m/z=336.3 [M−H]−.
A solution of tert-butyl 4-(cyano(4-fluorophenyl)methyl)piperidine-1-carboxylate (555 mg, 1.74 mmol, CAS RN 1824014-64-3) in HBr 48% in water (8.27 g, 5.55 mL, 49.1 mmol) was stirred at reflux for 4.5 hours. The mixture was evaporated. The light brown solid was suspended in 2-propanol (2 mL), homogenized and filtered. The filter cake was washed three times with 2-propanol (1 mL each). The mother liquor was completely evaporated and dried for 2 hours at high vacuum in the presence of P2O5 to yield the desired product as a light brown solid (0.535 g; 96.5%). MS (ESI): m/z=238.2 [M−HBr+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(3-(trifluoromethoxy)phenyl)azetidine-1-carboxylate (CAS RN 2222044-21-3) as a colorless solid. MS (ESI): 218.1 [M+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(4-(pentafluoro-6-sulfaneyl)phenyl)azetidine-1-carboxylate as a colorless solid. MS (ESI): 260.1 [M+H]+.
The product was obtained in analogy to BB35, intermediate from (4-(pentafluoro-16-sulfaneyl)phenyl)boronic acid (CAS RN 871507-70-9) as a colorless oil. MS (ESI): m/z=304.1 [M-C4H8+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(5-chloropyridin-2-yl)azetidine-1-carboxylate and twice the amount of p-TsOH as a colorless solid. MS (ESI): m/z=169.1 [M+H]+.
The product was obtained in analogy to BB37, intermediate from (5-chloropyridin-2-yl)boronic acid and tert-butyl 3-iodoazetidine-1-carboxylate as a colorless oil (0.045 g; 11.2%). MS (ESI): m/z=213.1 [M-C4H8+H].
The product was obtained in analogy to BB28 from tert-butyl 3-(2-fluoro-4-(trifluoromethoxy)phenyl)azetidine-1-carboxylate as a colorless solid. MS (ESI): m/z=236.1 [M+H]+.
The product was obtained in analogy to BB35, intermediate from (2-fluoro-4-(trifluoromethoxy)phenyl)boronic acid (CAS RN 503309-10-2) as a colorless oil. MS (ESI): m/z=280.1 [M-C4H8+H]+.
The product was obtained in analogy to BB26, intermediate a from tert-butyl 3-[4-(2,2,2-trifluoroethyl)phenyl]azetidine-1-carboxylate as a yellow oil. MS (ESI): m/z=216.2 [M+H]+.
The product was obtained in analogy to BB37, intermediate a from 1-bromo-4-(2,2,2-trifluoroethyl)benzene (CAS RN 155820-88-5) as a yellow oil. MS (ESI): m/z=260.0 [M-C4H8+H]+.
The product was obtained in analogy to BB26, intermediate a from tert-butyl 3-[4-[1-(trifluoromethyl)cyclopropyl]phenyl]azetidine-1-carboxylate as a yellow oil. MS (ESI): m/z=242.1 [M+H]+.
The product was obtained in analogy to BB37, intermediate from 1-bromo-4-[1-(trifluoromethyl)cyclopropyl]benzene (CAS RN 1227160-18-0) as a yellow oil. MS (ESI): m/z=286.0 [M-C4H8+H]+.
The product was obtained in analogy to BB28 a from tert-butyl 3-(3-fluoro-4-(trifluoromethoxy)phenyl)azetidine-1-carboxylate as a colorless solid. MS (ESI): m/z=236.1 [M+H]+.
The product was obtained in analogy to BB37, intermediate from 4-bromo-2-fluoro-1-(trifluoromethoxy)benzene (CAS RN 105529-58-6) as a colorless oil. MS (ESI): m/z=280.1 [M-C4H8+H]+.
The product was obtained in analogy to BB28 a from tert-butyl 3-(3-methyl-4-(trifluoromethoxy)phenyl)azetidine-1-carboxylate as a colorless solid. MS (ESI): m/z=232.1 [M+H]+.
The product was obtained in analogy to BB37, intermediate from 4-bromo-2-methyl-1-(trifluoromethoxy)benzene (CAS RN 887268-26-0) as a colorless oil. MS (ESI): m/z=276.2 [M-C4H8+H]+.
The product was obtained in analogy to BB28 a from tert-butyl 3-(3,5-difluoro-4-(trifluoromethoxy)phenyl)azetidine-1-carboxylate as a colorless solid. MS (ESI): m/z=254.1 [M+H]+.
The product was obtained in analogy to BB37, intermediate a from 5-bromo-1,3-difluoro-2-(trifluoromethoxy)benzene (CAS RN 115467-07-7) as a colorless solid. MS (ESI): m/z=298.1 [M-C4H8+H]+.
The product was obtained in analogy to BB28 a from tert-butyl 3-(2-chloro-4-(trifluoromethoxy)phenyl)azetidine-1-carboxylate as a colorless solid. MS (ESI): m/z=252.1 [M+H]+.
The product was obtained in analogy to BB37, intermediate a from 1-bromo-2-chloro-4-(trifluoromethoxy)benzene (CAS RN 892845-59-9) as a colorless oil. MS (ESI): m/z=296.1 [M-C4H8+H]+.
The product was obtained in analogy to BB28 a from tert-butyl 3-(4-(bicyclo[1.1.1]pentan-1-yl)phenyl)azetidine-1-carboxylate as a colorless solid. MS (ESI): m/z=200.2 [M+H]+.
The product was obtained in analogy to BB37, intermediate a from 1-(4-bromophenyl)bicyclo[1.1.1]pentane (CAS RN 1823935-76-7) as a colorless oil. MS (ESI): m/z=244.2 [M-C4H8+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(3-cyano-4-(trifluoromethoxy)phenyl)azetidine-1-carboxylate as a light brown gum. MS (ESI): m/z=243.1 [M+H]+. The compound was used in the next step without further purification.
The product was obtained in analogy to BB37, intermediate a from 5-bromo-2-(trifluoromethoxy)benzonitrile (CAS RN 1210906-15-2) as a light yellow oil. MS (ESI): m/z=287.1 [M-C4H8+H]+.
To a solution of tert-butyl 3-(4-(1-(hydroxymethyl)cyclopropyl)phenyl)azetidine-1-carboxylate (40 mg, 132 μmol) in DCM (0.7 mL) was added HCl in dioxane 4M (330 μL, 1.32 mmol) and the mixture was stirred at RT for 3 hours. To the light yellow suspension was added diethyl ether (2 mL) and the oily mixture was evaporated to get the desired compound as a light yellow oil. MS (ESI): m/z=204.2 [M+H]+. The compound was used in the next step without further purification.
To an ice-cold solution of tert-butyl 3-(4-(1-(methoxycarbonyl)cyclopropyl)phenyl)azetidine-1-carboxylate (238 mg, 718 μmol) in THF (2 mL) was added dropwise a solution of LAH 1M in THF (718 μL, 718 μmol). The solution was stirred at 0° C. for 1.25 hours and then poured on half-saturated aqueous NH4Cl solution and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The organic layers were dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 4 g column using an MPLC system eluting with a gradient of n-heptane:EtOAc (100:0 to 50:50) to provide the desired compound as a colorless oil (0.151 g; 69.3%). MS (ESI): m/z=248.2 [M-C4H8+H]+.
The product was obtained in analogy to Method A7 from methyl 1-(4-bromophenyl)cyclopropane-1-carboxylate (CAS RN 638220-35-6) and tert-butyl 3-bromoazetidine-1-carboxylate (CAS RN 1064194-10-0) as a colorless solid. MS (ESI): m/z=276.2 [M-C4H8+H]+.
The product was obtained in analogy to BB52 a from tert-butyl 3-(1-methyl-1H-indazol-4-yl)azetidine-1-carboxylate as a light yellow solid. MS (ESI): m/z=188.2 [M+H]+.
The product was obtained in analogy to Method A7 from 4-bromo-1-methyl-1H-indazole (CAS RN 365427-30-1) and tert-butyl 3-bromoazetidine-1-carboxylate (CAS RN 1064194-10-0) as a light brown oil. MS (ESI): m/z=232.1 [M-C4H8+H]+.
The product was obtained in analogy to BB26, intermediate a from tert-butyl 3-[4-(trifluoromethoxy)phenyl]pyrrolidine-1-carboxylate as light brown solid. MS (ESI): m/z=232.6 [M+H]+.
The product was obtained in analogy to BB17, intermediate a from tert-butyl 3-[4-(trifluoromethoxy)phenyl]-2,5-dihydropyrrole-1-carboxylate as light yellow oil (200 mg, 66.3%). MS (ESI): m/z=276.5 [M-C4H8+H]+.
To a solution of tert-butyl 3-(((trifluoromethyl)sulfonyl)oxy)-2,5-dihydro-1H-pyrrole-1-carboxylate (1 g, 3.15 mmol, CAS RN 630121-86-7) and 4-(trifluoromethoxy)phenylboronic acid (973.57 mg, 4.73 mmol, CAS RN 139301-27-2), Na2CO3 (668.1 mg, 6.3 mmol) in 1,4-Dioxane (20 mL) and water (5 mL) was added [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (461.24 mg, 0.630 mmol) and the mixture was stirred at 100° C. under N2 atmosphere for 12 h. The reaction was concentrated and purified by silica gel chromatography (PE:EtOAc=20:1) to get the desired product as light yellow oil (320 mg, 30.8%). MS (ESI): m/z=274.5 [M-C4H8+H]+.
To a solution of 2-bromo-3-chloropyridine (576.0 mg, 2.99 mmol, CAS RN 96424-68-9) in toluene (20 mL) under N2 was added dropwise n-BuLi 2.5 M in hexane (1.32 mL, 3.29 mmol) at −78° C. The reaction mixture was stirred for 2 h, followed by the addition of tributyltin chloride (1071.73 mg, 3.29 mmol, CAS RN 1461-22-9). The reaction mixture was stirred 2 h at −78° C., warmed to RT and stirred another 12 h, and then quenched with saturated NH4Cl solution (50 mL). The mixture was extracted with EtOAc (30 mL three times), and the combined organic layers were washed with brine (15 mL), dried (Na2SO4), and filtered. The filtrate was concentrated in vacuo to the desired product as a light yellow oil (1.1 g, 91.3%). MS (ESI): m/z=404.1 [M+H]+.
The product was obtained in analogy to BB52 a from tert-butyl 3-(1-methyl-1H-indazol-6-yl)azetidine-1-carboxylate as a colorless solid. MS (ESI): m/z=188.1 [M+H]+.
The product was obtained in analogy to Method A7 from 6-bromo-1-methyl-1H-indazole (CAS RN 365427-30-1) and tert-butyl 3-bromoazetidine-1-carboxylate (CAS RN 1064194-10-0) as a light yellow oil. MS (ESI): m/z=288.2 [M+H]+.
The product was obtained in analogy to Method A4 using 3-[3-(trifluoromethoxy)phenyl]pyrrolidine 2,2,2-trifluoroacetate to get the desired product as light yellow solid. MS (ESI): m/z=414.3 [M+H]+.
The product was obtained in analogy to BB26, intermediate a from tert-butyl 3-[3-(trifluoromethoxy)phenyl]pyrrolidine-1-carboxylate as light brown oil. MS (ESI): m/z=232.6 [M+H]+.
The product was obtained in analogy to BB54, intermediate a from tert-butyl 3-[3-(trifluoromethoxy)phenyl]-2,5-dihydropyrrole-1-carboxylate to get the desired product as light yellow oil. MS (ESI): m/z=276.5 [M-C4H8+H]+.
The product was obtained in analogy to BB54, intermediate b from 3-(trifluoromethoxy)phenylboronic acid (CAS RN 179113-90-7) to get the desired product as a light brown oil. MS (ESI): m/z=274.5 [M-C4H8+H]+.
The product was obtained in analogy to BB26, intermediate a from tert-butyl 2-methyl-3-(4-(trifluoromethoxy)phenyl)azetidine-1-carboxylate as a crude. MS (ESI): m/z=232.2 [M+H]+.
A microwave tube was charged with a solution of tert-butyl (Z)-3-(2-((4-methoxyphenyl)sulfonyl)hydrazineylidene)-2-methylazetidine-1-carboxylate (265.5 mg, 719 μmol) and (4-(trifluoromethoxy)phenyl)boronic acid (222 mg, 1.08 mmol, CAS RN 139301-27-2) in Dioxane (2.87 mL). To the solution cesium carbonate (351 mg, 1.08 mmol) was added. The RM was degassed with argon, the vial sealed and heated whilst stirring to 110 C for 18 h. The RM was cooled to RT before being quenched with 2 mL saturated aqueous NaHCO3 solution and extracted three times with DCM. The combined organic layers were dried over MgSO4 and concentrated in vacuo yielding desired product as a yellow oil (71.1 mg; 29.9%). MS (ESI): m/z=276.2 [M-C4H8+H]+.
A solution of 4-methoxybenzenesulfonohydrazide (180 mg, 890 μmol, CAS RN1950-68-1) and tert-butyl 2-methyl-3-oxoazetidine-1-carboxylate (165 mg, 890 μmol, CAS RN 1408076-36-7) in DMSO d6 (593 μL) was heated to 60 C whilst stirring for 1 h. The reaction mixture was cooled to RT and poured on stirring H2O, liberating a white precipitate. The precipitate was filtered and redissolved in MeOH. Solvent was removed in vacuo yielding desired product as a yellow oil (265.5 mg; 80.7%). MS (ESI): m/z=368.3 [M−H]−.
The product was obtained in analogy to BB28 from tert-butyl 3-(3,3-dimethyl-2,3-dihydrobenzofuran-6-yl)azetidine-1-carboxylate as a colorless solid. MS (ESI): m/z=204.2 [M+H]+.
The product was obtained in analogy to method A7 from 6-bromo-3,3-dimethyl-2,3-dihydrobenzofuran (CAS RN 140896-85-1) as a colorless solid. MS (ESI): m/z=248.2 [M-C4H8+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(3-chloro-5-(2,2,2-trifluoroethoxy)phenyl)pyrrolidine-1-carboxylate as a colorless oil. MS (ESI): m/z=280.1 [M+H]+.
The product was obtained in analogy to method A7 from 1-bromo-3-chloro-5-(2,2,2-trifluoroethoxy)benzene as a colorless oil. MS (ESI): m/z=324.1 [M-C4H8+H]+.
To a solution of 3-bromo-5-chlorophenol (330 mg, 1.59 mmol, CAS RN 56962-04-0) and 2,2,2-trifluoroethyl trifluoromethanesulfonate (554 mg, 2.39 mmol) in DMF (3 mL) was added potassium carbonate (440 mg, 3.18 mmol) and the mixture was stirred at 50° C. over weekend. After cooling down, the reaction mixture was poured on water and EtOAc and the layers were separated. The aqueous layer was extracted twice with EtOAc. The organic layers were washed twice with water, dried over MgSO4, filtered and evaporated to furnish the desired compound as a colorless oil (0.484 g; 100%). Compound was used in the next step without further purification.
The product was obtained in analogy to BB28 from tert-butyl 3-(4-(1-methoxy-2-methyl-1-oxopropan-2-yl)phenyl)azetidine-1-carboxylate as a colorless gum. MS (ESI): m/z=234.2 [M+H]+.
The product was obtained in analogy to method A7 from methyl 2-(4-bromophenyl)-2-methylpropanoate (CAS RN 154825-97-5) as a light yellow oil. MS (ESI): m/z=278.2 [M-C4H8+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(3,5-dichlorophenyl)pyrrolidine-1-carboxylate as a brown oil. MS (ESI): m/z=216.0 [M+H]+.
The product was obtained in analogy to method A7 from 1-bromo-3,5-dichlorobenzene (CAS RN 19752-55-7) as a colorless oil. MS (ESI): m/z=260.1 [M-C4H8+H]+.
The product was obtained in analogy to BB26, intermediate a from tert-butyl 3-[4-[5-(2,2-dimethylpropyl)-1,3,4-oxadiazol-2-yl]phenyl]azetidine-1-carboxylate as a light brown oil. MS (ESI): m/z=272.6 [M+H]+.
The product was obtained in analogy to method A7 from 2-(4-bromophenyl)-5-(2,2-dimethylpropyl)-1,3,4-oxadiazole as a light brown oil. MS (ESI): m/z=372.5 [M+H]+.
To a solution of 4-bromo-N′-(3,3-dimethylbutanoyl)benzohydrazide (5 g, 15.96 mmol) in toluene (102 mL) was added p-toluenesulfonic acid (5.5 g, 31.93 mmol),then stirred at 110° C. for 12 h. LCMS showed the reaction was complete, the mixture was concentrated and the residue was purified by silica gel chromatography eluted with PE:EtOAc=10:1 to give the desired product as a light yellow solid (1 g, 21.2%). MS (ESI): m/z=295.4 [M+H]+.
A solution of 4-bromobenzohydrazide (5.0 g, 23.25 mmol, CAS RN 5933-32-4) and DIPEA (12.39 mL, 69.75 mmol) in DCM (50 mL) was added 3,3-dimethylbutyryl chloride (3.76 g, 27.9 mmol, CAS RN 7065-46-5) under 0° C., the mixture was stirred at 20° C. for 12 h. The aqueous layer was extracted by EtOAc (200 mL, 3 times) and water (100 mL, 3 times). The separated organic layer was washed with water, dried over Na2SO4 and evaporated to give the desired product as light yellow solid (7 g, 96.1%). MS (ESI): m/z=315.4 [M+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(4-(tert-butyl)-3-methoxyphenyl)azetidine-1-carboxylate as crude. MS (ESI): m/z=220.2 [M+H]+.
The product was obtained in analogy to method A7 from 4-bromo-1-(tert-butyl)-2-methoxybenzene (CAS RN 30788-02-4) as a light yellow oil. MS (ESI): m/z=264.2 [M-C4H8+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(1-methyl-1H-indazol-5-yl)azetidine-1-carboxylate as crude. MS (ESI): m/z=188.1 [M+H]+.
The product was obtained in analogy to method A7 from 5-bromo-1-methyl-1H-indazole (CAS RN 465529-57-1) as a yellow oil. MS (ESI): m/z=288.2 [M+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(4-propylphenyl)azetidine-1-carboxylate as crude. MS (ESI): m/z=176.1 [M+H]+.
The product was obtained in analogy to method A7 from 1-bromo-4-propylbenzene (CAS RN 588-93-2) as a light yellow oil. MS (ESI): m/z=220.2 [M-C4H8+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(4-(trifluoromethoxy)-3-(trifluoromethyl)phenyl)azetidine-1-carboxylate as crude. MS (ESI): m/z=286.1 [M+H]+.
The product was obtained in analogy to method A7 from 4-bromo-1-(trifluoromethoxy)-2-(trifluoromethyl)benzene (CAS RN 933674-89-6) as a light yellow oil. MS (ESI): m/z=330.1 [M-C4H8+H]+.
The product was obtained in analogy to BB26, intermediate a from tert-butyl 3-[4-[[1-(trifluoromethyl)cyclopropyl]methoxy]phenyl]azetidine-1-carboxylate as a yellow oil. MS (ESI): m/z=272.1 [M+H]+.
The product was obtained in analogy to method A7 from 1-bromo-4-[[1-(trifluoromethyl)cyclopropyl]methoxy]benzene (CAS RN 1594130-28-5) as alight yellow oil. MS (ESI): m/z=316.1 [M-C4H8+H]+.
The product was obtained in analogy to BB26, intermediate a from tert-butyl 3-[4-(2,2,2-trifluoro-1,1-dimethyl-ethyl)phenyl]azetidine-1-carboxylate as a yellow oil. MS (ESI): m/z=244.1[M+H]+.
The product was obtained in analogy to method A7 from 1-bromo-4-(2,2,2-trifluoro-1,1-dimethyl-ethyl)benzene (CAS RN 1225380-05-1) as a light yellow oil. MS (ESI): m/z=288.1 [M-C4H8+H]+.
The product was obtained in analogy to BB26, intermediate a from tert-butyl 3-[4-[5-(2,2-dimethylpropyl)-1,2,4-oxadiazol-3-yl]phenyl]azetidine-1-carboxylate as alight yellow oil. MS (ESI): m/z=272.6 [M+H]+.
A solution of tert-butyl 3-[4-(N-hydroxycarbamimidoyl)phenyl]azetidine-1-carboxylate (770.0 mg, 2.64 mmol) and DIPEA (1.41 mL, 7.93 mmol) in toluene (6 mL) was added 3,3-dimethylbutyryl chloride (426.88 mg, 3.17 mmol, CAS RN 7065-46-5) under 0° C., the mixture was stirred at 25° C. for 10 min, then the temperature was turn up to 80° C. and stirred for 12 h. The mixture was evaporated and the residue was purified by silica gel chromatography (PE:EtOAc=10:1) to give the desired product as light brown oil (620 mg, 63.2%). MS (ESI): m/z=316.5 [M-C4H8+H]+.
A solution of hydroxylamine hydrochloride (349.71 mg, 5.03 mmol) in Ethanol (8 mL) was added sodium carbonate (266.69 mg, 2.52 mmol) in water (2 mL),and stirred at 20° C. for 25 min. Then tert-butyl 3-(4-cyanophenyl)azetidine-1-carboxylate (1000.0 mg, 3.87 mmol, CAS RN 206446-41-5) was added, the mixture was stirred at 95° C. for 12 h.
The mixture was diluted with water, concentrated under vacuum to remove the EtOH, the residue was partitioned between EtOAc (100 mL) with water (100 mL×3), then saturated sodium chloride (50 mL), dried over sodium sulfate, and evaporated to give the desired product as light yellow oil (773 mg, 68.5%). MS (ESI): m/z=292.5 [M+H]+.
The product was obtained in analogy to method A4 from 3-[4-(2,2,2-trifluoro-1-methyl-ethoxy)phenyl]azetidine 2,2,2-trifluoroacetate as a light yellow solid. MS (ESI): m/z=428.3 [M+H]+.
The product was obtained in analogy to BB26, intermediate a from tert-butyl 3-[4-(2,2,2-trifluoro-1-methyl-ethoxy)phenyl]azetidine-1-carboxylate as a light yellow oil. MS (ESI): m/z=246.1 [M+H]+.
The product was obtained in analogy to method A7 from 1-bromo-4-(2,2,2-trifluoro-1-methyl-ethoxy)benzene (CAS RN 1239611-43-8) as a colorless solid. MS (ESI): m/z=290.1 [M-C4H8+H]+.
The product was obtained in analogy to BB28 from tert-butyl 3-(3-methoxy-4-methylphenyl)azetidine-1-carboxylate as colorless solid. MS (ESI): m/z=178.1[M+H]+.
The product was obtained in analogy to method A7 from 4-bromo-2-methoxy-1-methylbenzene (CAS RN 67868-73-9) as a light brown oil. MS (ESI): m/z=222.1 [M-C4H8+H]+.
The product was obtained in analogy to BB16 from tert-butyl 4-((4-fluorophenyl)((1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl)oxy)methyl)piperidine-1-carboxylate as colorless foam (0.194 g; 98.0%). MS (ESI): m/z=358.2 [M+H]+.
To a yellow solution of tri-n-butylphosphine (327 mg, 399 μL, 1.62 mmol) and azodicarboxylic dipiperidide (408 mg, 1.62 mmol) in toluene (12.5 mL) was added tert-butyl 4-((4-fluorophenyl)(hydroxy)methyl)piperidine-1-carboxylate (250 mg, 808 μmol, CAS RN 160296-41-3) and the mixture was stirred at RT for 20 min. This led to a pale yellow solution. Addition of 1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-ol (268 mg, 1.62 mmol, CAS RN 119022-51-4) gave a suspension. After stirring at RT for 75 min. heating was installed. After stirring at 65° C. for 19 h, the reaction mixture was cooled down to RT. Silica gel was added and the mixture was evaporated. The compound was purified by silica gel chromatography on a 12 g column using an MPLC (ISCO) system eluting with a gradient of n-heptane:EtOAc (100:0 to 50:50) to get the desired compound as a colorless gum (0.230 g; 62.2%). MS (ESI): m/z=358.2 [M-Boc+H]+.
To a solution of tert-butyl 3-(1-(4-(trifluoromethyl)phenyl)ethoxy)azetidine-1-carboxylate (0.04 g, 0.116 mmol) in DCM (0.6 mL) was added TFA (0.178 mL, 2.32 mmol) and the reaction mixture was stirred at RT for 30 min. The solvent was removed under reduced pressure and the residue was taken up in EtOAc, poured into a sat. aq. Na2CO3 solution (5 mL) and the aqueous layer was extracted twice with EtOAc (10 mL each). The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated in vacuo to give the crude title compound (0.025 g, 88%) as a colorless gum; MS (ESI): m/z=246.2 [M+H]+.
To a solution of tert-butyl 3-hydroxyazetidine-1-carboxylate (0.1 g, 0.577 mmol) in DMF (5 mL) cooled to 0° C. with an ice bath, was added NaH (60% in mineral oil; 0.023 g, 0.577 mmol) and the reaction mixture was stirred at this temperature for 15 min. Then, 1-(1-bromoethyl)-4-(trifluoromethyl)benzene (0.161 g, 0.635 mmol, CAS RN 68120-42-3) was added and the mixture was allowed to warm up to RT and stirring was continued overnight. The mixture was poured into a sat. aq. solution of ammonium chloride (15 mL) and extracted twice with EtOAc (20 mL each). The organic layers were dried over Na2SO4 and concentrated in vacuo. The residue was purified by silica gel flash chromatography eluting with a gradient of EtOAc in n-heptane (0% to 70%) to give the title compound (0.045 g, 22.6%) as a colorless amorphous solid. MS (ESI): m/z=290.2 [M-C4H8+H]+.
The product was obtained in analogy to BH1, using tert-butyl 4-hydroxypiperidine-1-carboxylate (CAS RN 109384-19-2) in the intermediate step, and then a solution of 4M HCl/dioxane in MeOH instead of TFA/DCM for the deprotection step. Colorless solid; MS (ESI): 274.1 [M+H]+.
The product was obtained in analogy to BB28, using tert-butyl 3-(6-methoxypyridin-3-yl)azetidine-1-carboxylate. Colorless solid. MS (ESI)=165.1 [M+H]+.
The product was obtained in analogy to BB35, intermediate, using (6-methoxypyridin-3-yl)boronic acid (CAS RN 163105-89-3), as a colorless oil. MS (ESI)=265.2 [M+H]+.
The product was obtained in analogy to BB28, using tert-butyl 3-[3-chloro-4-(trifluoromethoxy)phenyl]azetidine-1-carboxylate, as a colorless solid; MS (ESI)=252.1 [M+H]+.
The product was obtained in analogy to BB35, intermediate, using (3-chloro-4-(trifluoromethoxy)phenyl)boronic acid (CAS RN 870822-79-0), as a colorless liquid. MS (ESI)=296.1 [M-C4H8+H]+.
The product was obtained in analogy to example 132, using 3-[3-bromo-4-(trifluoromethoxy)phenyl]azetidine 4-methylbenzenesulfonate, as a light yellow solid. MS (ESI)=480.1 [M+H]+.
The product was obtained in analogy to BB28, using tert-butyl 3-[3-bromo-4-(trifluoromethoxy)phenyl]azetidine-1-carboxylate, as a colorless solid. MS (ESI)=296.0 [M+H]+.
The product was obtained in analogy to BB35, intermediate, using (3-bromo-4-(trifluoromethoxy)phenyl)boronic acid (MFCD22580724; Apollo Scientific), as a colorless viscous oil. MS (ESI)=342.0 [M-C4H8+H]+.
The product was obtained in analogy to BB28, using tert-butyl 3-[3-fluoro-4-(trifluoromethyl)phenyl]azetidine-1-carboxylate. Colorless solid. MS (ESI): 220.1 [M+H]+.
The product was obtained in analogy to BB37, intermediate, using 4-bromo-2-fluoro-1-(trifluoromethyl)benzene, as a colorless viscous oil. MS (ESI): 264.1 [M-C4H8+H]+.
A solution of 2-[(3,4-dimethoxyphenyl)-(4-piperidyl)methyl]pyridine (101 mg, 0.320 mmol), cesium carbonate (97 mg, 0.30 mmol) and (4-nitrophenyl) (4aR,8aS)-3-oxo-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazine-6-carboxylate (intermediate BB15a) (80 mg, 0.25 mmol) in DMF (5 mL) was stirred at 25° C. for 16 h. The solution was poured into brine (10 mL) and extracted twice with EtOAc (10 mL each). The combined organic layers were concentrated under vacuum to give a residue, that was purified by Prep-HPLC (TFA condition) to give (4aR,8aS)-6-[4-[(3,4-dimethoxyphenyl)-(2-pyridyl)methyl]piperidine-1-carbonyl]-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazin-3-one (60 mg, 49%) as white solid. MS (ESI): m/z=495.3 [M+H]+.
To a solution at −78° C. of 4-bromoveratrole (12.4 g, 57.3 mmol) in THF (200 mL) was added a butyllithium solution (28.6 mL, 71.6 mmol) and the solution was stirred at −78° C. for 1 h. Then tert-butyl 4-[methoxy(methyl)carbamoyl]piperidine-1-carboxylate (CAS Nr. 139290-70-3) (13.0 g, 47.7 mmol) was added at −78° C. and stirring was continued at −78° C. for 5 h. The solution was poured into brine (20 mL) and extracted with EtOAc (2×10 mL). The combined organic layers were concentrated under vacuum to give a residue which was purified by flash column chromatography (PE:EtOAc=2:1) to give the title compound as white solid. MS (ESI): m/z=372.1 [M+Na]+.
A solution of 4-methylbenzenesulfonhydrazide (6.40 g, 34.3 mmol) and tert-butyl 4-(3,4-dimethoxybenzoyl)piperidine-1-carboxylate (10.0 g, 28.6 mmol) in 1,4-dioxane (200 mL) was stirred at 80° C. for 24 h. The reaction solution was concentrated under vacuum to give a residue that was purified by flash column chromatography (petroleum ether:EtOAc=2:1) to give the title compound (8.0 g, 54%) as light yellow solid. MS (ESI): m/z=540.2 [M+Na]+.
A mixture of 2-bromopyridine (1.11 mL, 11.6 mmol), tert-butyl 4-[C-(3,4-dimethoxyphenyl)-N-(p-tolylsulfonylamino)carbonimidoyl]piperidine-1-carboxylate (3.00 g, 5.8 mmol), lithium tert-butoxide (557 mg, 6.95 mmol) and bis(triphenylphosphine)palladium(II) chloride (407 mg, 0.580 mmol) in 1,4-dioxane (37 mL) was stirred at 90° C. for 16 h under N2. Solids were filtered off and the solution was poured into brine (30 mL) and then extracted with EtOAc (2×20 mL). The combined organic layers were concentrated under vacuum. The residue was purified by flash column chromatography (petroleum ether:EtOAc=1:1) to give the desired compound as a colorless oil (280 mg, 12%). MS (ESI): m/z=411.3 [M+H]+.
A solution of tert-butyl 4-[(3,4-dimethoxyphenyl)-(2-pyridyl)methylene]piperidine-1-carboxylate (280 mg, 0.680 mmol) and trifluoroacetic acid (0.53 mL, 6.82 mmol) in DCM (10 mL) was stirred at 25° C. for 4 h. The solution was concentrated under vacuum to give the title compound as colorless oil (200 mg, 94%). MS (ESI): m/z=311.1 [M+H]+.
A solution of 2-[(3,4-dimethoxyphenyl)-(4-piperidylidene)methyl]pyridine (200 mg, 0.640 mmol) and Pd/C (69 mg, 0.060 mmol) in DMF (5 mL) was stirred at 25° C. for 6 h under H2 (760 mmHg). The solution was concentrated under vacuum to give a residue, that was purified by prep-HPLC (TFA condition) to give the compound as colorless oil (150 mg, 71%). MS (ESI): m/z=313.3 [M+H]+.
A solution of 3-[(3,4-dimethoxyphenyl)-(4-piperidyl)methyl]pyridine (126 mg, 0.400 mmol), cesium carbonate (122 mg, 0.370 mmol) and (4-nitrophenyl) (4aR,8aS)-3-oxo-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazine-6-carboxylate (intermediate BB15a) (100 mg, 0.310 mmol) in DMF (5 mL) was stirred at 25° C. for 16 h. The solution was poured into brine (10 mL) and extracted with EtOAc (2×10 mL). The combined organic layers were concentrated under vacuum to give a residue, that was purified by prep-HPLC (TFA condition) to give the desired compound as white solid (80 mg, 52%). MS (ESI): m/z=495.3 [M+H]+.
A mixture of tert-butyl 4-[C-(3,4-dimethoxyphenyl)-N-(p-tolylsulfonylamino)carbonimidoyl]piperidine-1-carboxylate (intermediate b, examples 118/119) (2.00 g, 3.86 mmol), 3-bromopyridine (0.56 mL, 5.8 mmol), lithium tert-butoxide (464 mg, 5.8 mmol) and bis(triphenylphosphine)palladium(II) chloride (271 mg, 0.390 mmol) in DMF (30 mL) was stirred at 90° C. for 16 h under N2. The mixture was filtered and the filtrate was poured into brine (50 mL) and then extracted with EtOAc (2×40 mL). The combined organic layers were concentrated under vacuum to give a residue which was purified by flash column chromatography (petroleum ether:EtOAc=2:1). tert-Butyl 4-[(3,4-dimethoxyphenyl)-(3-pyridyl)methylene]piperidine-1-carboxylate was obtained as colorless oil (600 mg, 38%). MS (ESI): m/z=411.2 [M+H]+.
A solution of tert-butyl 4-[(3,4-dimethoxyphenyl)-(3-pyridyl)methylene]piperidine-1-carboxylate (600 mg, 1.46 mmol) and trifluoroacetic acid (1.13 mL, 15 mmol) in DCM (10 mL) was stirred at 25° C. for 4 h. The solution was concentrated under vacuum to give crude 3-[(3,4-dimethoxyphenyl)-(4-piperidylidene)methyl]pyridine (450 mg, 49%, as TFA salt) as a brown oil, which was used directly in the next step. MS (ESI): m/z=311.1 [M+H]+.
A mixture of 3-[(3,4-dimethoxyphenyl)-(4-piperidylidene)methyl]pyridine (450 mg, 0.710 mmol) and Pd/C (38 mg, 0.040 mmol) in DMF (10 mL) was stirred at 25° C. for 16 h under H2 (760 mmHg). The mixture was filtered and concentrated under vacuum to give a residue, which was purified by prep-HPLC (TFA condition) to give the desired compound as colorless oil (220 mg, 99%). MS (ESI): m/z=313.2 [M+H]+.
A solution of 4-[(3,4-dimethoxyphenyl)-(4-piperidyl)methyl]pyridine (100 mg, 0.320 mmol), cesium carbonate (97 mg, 0.30 mmol) and (4-nitrophenyl) (4aR,8aS)-3-oxo-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazine-6-carboxylate (intermediate BB15a) (80 mg, 0.25 mmol) in DMF (4 mL) was stirred at 25° C. for 16 h. The solution was poured into brine (10 mL) and extracted twice with EtOAc (10 mL each). The combined organic layers were concentrated under vacuum to give a residue, which was purified by prep-HPLC (TFA condition) to give the title compound as white solid (60 mg, 49%). MS (ESI): m/z=495.3 [M+H]+.
A mixture of 4-bromopyridine (0.56 mL, 5.8 mmol), tert-butyl 4-[C-(3,4-dimethoxyphenyl)-N-(p-tolylsulfonylamino)carbonimidoyl]piperidine-1-carboxylate (intermediate b, examples 118/119) (2.00 g, 3.86 mmol), lithium tert-butoxide (464 mg, 5.8 mmol) and bis(triphenylphosphine)palladium(II) chloride (271 mg, 0.390 mmol) in DMF (30 mL) was stirred under N2 at 90° C. for 16 h. The mixture was filtered and the filtrate was poured into brine (30 mL) and then extracted with EtOAc (2×20 mL). The combined organic layers were concentrated under vacuum to give a residue which was purified by flash column chromatography (petroleum ether:EtOAc=2:1). tert-Butyl 4-[(3,4-dimethoxyphenyl)-(4-pyridyl)methylene]piperidine-1-carboxylate (400 mg, 25%) was obtained as colorless oil. MS (ESI): m/z=411.3[M+H]+.
A solution of tert-butyl 4-[(3,4-dimethoxyphenyl)-(4-pyridyl)methylene]piperidine-1-carboxylate (400 mg, 0.970 mmol) and trifluoroacetic acid (0.75 mL, 9.7 mmol) in DCM (15 mL) was stirred at 25° C. for 4 h. The solution was concentrated under vacuum to give crude 4-[(3,4-dimethoxyphenyl)-(4-piperidylidene)methyl]pyridine (as TFA salt; 250 mg, 83%) as a brown oil, which was used directly in the next step. MS (ESI): m/z=311.2 [M+H]+.
A mixture of 4-[(3,4-dimethoxyphenyl)-(4-piperidylidene)methyl]pyridine (250 mg, 0.810 mmol) and Pd/C (43 mg, 0.040 mmol) in DMF (6 mL) was stirred at 25° C. for 16 h under H2 (760 mmHg). The mixture was filtered and concentrated under vacuum to give a residue, that was purified by prep-HPLC (TFA condition) to give 4-[(3,4-dimethoxyphenyl)-(4-piperidyl)methyl]pyridine (200 mg, 79%) as colorless oil. MS (ESI): m/z=313.2 [M+H]+.
A solution of 3-[(3-methylsulfonylphenyl)-(4-piperidyl)methyl]pyridine (110 mg, 0.330 mmol), and (4-nitrophenyl) (4aR,8aS-3-oxo-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazine-6-carboxylate (intermediate BB15a) (160 mg, 0.500 mmol) in pyridine (5.5 mL) was stirred at 90° C. for 16 h. The solution was concentrated under vacuum to give a residue, that was purified by prep-HPLC (TFA condition) to give (4aR,8aS)-6-[4-[(3-methylsulfonylphenyl)-(3-pyridyl)methyl]piperidine-1-carbonyl]-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazin-3-one (95 mg, 61%) as white solid. MS (ESI): m/z=513.3 [M+H]+.
A solution of 4-methylbenzenesulfonhydrazide (1.54 g, 8.27 mmol) and tert-butyl 4-(pyridine-3-carbonyl)piperidine-1-carboxylate (CAS Nr. 148148-35-0) (2.00 g, 6.89 mmol) in 1,4-dioxane (200 mL) was stirred at 80° C. for 16 h. The reaction mixture was concentrated under vacuum to give a residue that was purified by flash column chromatography (petroleum ether:EtOAc=2:1) to give tert-butyl 4-[N-(p-tolylsulfonylamino)-C-(3-pyridyl)carbonimidoyl]piperidine-1-carboxylate (2.0 g, 63%) as light yellow solid MS (ESI): m/z=403.1 [M-C4H8+H]+.
A solution of 3-bromophenylmethylsulfone (1.54 g, 6.54 mmol), tert-butyl 4-[N-(p-tolylsulfonylamino)-C-(3-pyridyl)carbonimidoyl]piperidine-1-carboxylate (2.00 g, 4.36 mmol), lithium tert-butoxide (524 mg, 6.54 mmol) and bis(triphenylphosphine)palladium(II) chloride (918 mg, 1.31 mmol) in 1,4-dioxane (30 mL) was stirred at 90° C. for 16 h. The reaction was diluted with EtOAc (20 mL) and then filtered through Celite. The filtrate was dried over Na2SO4, filtered and concentrated under vacuum. The residue was purified by silica gel chromatography (petroleum ether:EtOAc=20:1 to 1:1) to afford tert-butyl 4-[(3-methylsulfonylphenyl)-(3-pyridyl)methylene]piperidine-1-carboxylate (400 mg, 21%) as light yellow oil. MS (ESI): m/z=429.2 [M+H]+.
A mixture of tert-butyl 4-[(3-methylsulfonylphenyl)-(3-pyridyl)methylene]piperidine-1-carboxylate (350 mg, 0.820 mmol) and Pd/C (43 mg, 0.410 mmol) in DMF (10 mL) was stirred at 25° C. for 16 h under H2 (760 mmHg). The mixture was filtered and concentrated under vacuum to give a residue, that was purified by prep-HPLC (basic condition) to give tert-butyl 4-[(3-methylsulfonylphenyl)-(3-pyridyl)methyl]piperidine-1-carboxylate (80 mg, 23%) as colorless oil and recovery of starting material (300 mg), The recovered starting material was subjected again to hydrogenation using the same conditions as above, yielding a second batch of product (110 mg, 31%) as colorless oil. Total yield 190 mg (54%). MS (ESI): m/z=375.0 [M-C4H8+H]+.
A solution of tert-butyl 4-[(3-methylsulfonylphenyl)-(3-pyridyl)methyl]piperidine-1-carboxylate (220.0 mg, 0.510 mmol) and trifluoroacetic acid (0.2 mL, 2.55 mmol) in DCM (4.4 mL) was stirred at 25° C. for 4 h. The solution was concentrated under vacuum to give 3-[(3-methylsulfonylphenyl)-(4-piperidyl)methyl]pyridine (as TFA salt; 160 mg, quant.) as colorless oil which was used in the next step without further purification.
A solution of 4-[(3-methylsulfonylphenyl)-(4-piperidyl)methyl]pyridine (150 mg, 0.450 mmol), and (4-nitrophenyl) (4aR,8aS)-3-oxo-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazine-6-carboxylate (intermediate BB15a) (219 mg, 0.680 mmol) in pyridine (6 mL) was stirred at 90° C. for 16 h. The solution was concentrated under vacuum to give a reside, which was purified by prep-HPLC (TFA condition) to give (4aR,8aS)-6-[4-[(3-methylsulfonylphenyl)-(4-pyridyl)methyl]piperidine-1-carbonyl]-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazin-3-one (60 mg, 26%) as colorless oil. MS (ESI): m/z=513.3 [M+H]+.
A solution of 4-methylbenzenesulfonhydrazide (1.31 g, 7.03 mmol) and tert-butyl 4-(pyridine-4-carbonyl)piperidine-1-carboxylate (CAS Nr. 1334415-27-8) (1.70 g, 5.85 mmol) in 1,4-dioxane (170 mL) was stirred at 80° C. for 16 h. The reaction mixture was concentrated under vacuum to give a residue which was purified by flash column chromatography (petroleum ether:EtOAc=2:1) to give tert-butyl 4-[N-(p-tolylsulfonylamino)-C-(4-pyridyl)carbonimidoyl]piperidine-1-carboxylate (1.60 g, 60%) as light yellow solid. MS (ESI): m/z=459.2 [M+H]+.
A solution of 3-bromophenylmethylsulfone (1.23 g, 5.23 mmol), tert-butyl 4-[N-(p-tolylsulfonylamino)-C-(4-pyridyl)carbonimidoyl]piperidine-1-carboxylate (1.60 g, 3.49 mmol), lithium tert-butoxide (419 mg, 5.23 mmol) and bis(triphenylphosphine)palladium(II) chloride (735 mg, 1.05 mmol) in 1,4-dioxane (32 mL) was stirred at 90° C. for 16 h. The reaction was diluted with EtOAc (5 mL), then filtered through Celite. The filtrate was separated, dried over Na2SO4, filtered and concentrated under vacuum. The residue was purified by silica gel chromatography (petroleum ether:EtOAc=20:1 to 1:1) to afford tert-butyl 4-[(3-methylsulfonylphenyl)-(4-pyridyl)methylene]piperidine-1-carboxylate (420 mg, 28%) as colorless oil. MS (ESI): m/z=429.2 [M+H]+.
A mixture of tert-butyl 4-[(3-methylsulfonylphenyl)-(4-pyridyl)methylene]piperidine-1-carboxylate (320 mg, 0.750 mmol) and Pd/C (795 mg, 0.750 mmol) in DMF (6.4 mL) was stirred at 25° C. for 16 h under H2 (760 mmHg). The mixture was filtered and concentrated under vacuum to give tert-butyl 4-[(3-methylsulfonylphenyl)-(4-pyridyl)methyl]piperidine-1-carboxylate (280 mg, 87%) as colorless oil. MS (ESI): m/z=431.2 [M+H]+.
A solution of tert-butyl 4-[(3-methylsulfonylphenyl)-(4-pyridyl)methyl]piperidine-1-carboxylate (280 mg, 0.650 mmol) and trifluoroacetic acid (0.25 mL, 3.2 mmol) in DCM (6 mL) was stirred at 25° C. for 4 h. The solution was concentrated under vacuum to give a residue, which was purified by prep-HPLC (basic condition) to afford 4-[(3-methylsulfonylphenyl)-(4-piperidyl)methyl]pyridine (150 mg, 61%) as colorless oil. MS (ESI): m/z=331.2 [M+H]+.
A solution of oxone (256 mg, 0.420 mmol) and (4aR,8aS)-6-[4-[(3-methylsulfanylphenyl)-(2-pyridyl)methyl]piperidine-1-carbonyl]-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazin-3-one (100 mg, 0.210 mmol) in water (5 mL) and MeCN (5 mL) was stirred at 25° C. for 16 h. The solution was poured into sat. aq. Na2CO3 (10 mL) and extracted with EtOAc (2×20 mL). The combined organic layers were concentrated under vacuum to give a residue, that was purified by prep-HPLC (TFA condition) to yield (4aR,8a)-6-[4-[(3-methylsulfonylphenyl)-(2-pyridyl)methyl]piperidine-1-carbonyl]-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazin-3-one (60 mg, 56%) as colorless oil. MS (ESI): m/z=513.3 [M+H]+.
To a solution at −78° C. of 3-bromothioanisole (1.00 mg, 4.92 mmol) in THF (30 mL) was added over a time of 0.5 h a solution of butyllithium (2.36 mL, 5.91 mmol). Then tert-butyl 4-(pyridine-2-carbonyl)piperidine-1-carboxylate (CAS Nr. 416852-19-2) (1.43 g, 4.92 mmol) was added and stirring was continued at −78° C. for 4.5 h. The solution was quenched by sat. aq. NH4Cl (50 mL) and extracted with EtOAc (2×30 mL). The combined organic layers were concentrated under vacuum to give a residue, which was purified by prep-HPLC (TFA condition) to yield tert-butyl 4-[hydroxy-(3-methylsulfanylphenyl)-(2-pyridyl)methyl]piperidine-1-carboxylate (1.40 g, 69%) as colorless oil. MS (ESI): m/z=415.2 [M+H]+.
A mixture of tert-butyl 4-[hydroxy-(3-methylsulfanylphenyl)-(2-pyridyl)methyl]piperidine-1-carboxylate (300 mg, 0.720 mmol), sulfurous dichloride (86 mg, 0.72 mmol) and in Tol (5 mL) was stirred at 25° C. for 6 h under N2. The mixture was concentrated under vacuum to give 2-[chloro-(3-methylsulfanylphenyl)-(4-piperidyl)methyl]pyridine (220 mg, 91%) as yellow solid, which was used as crude material in the next step. MS (ESI): m/z=333.1 [M+H]+.
A mixture of 2-[chloro-(3-methylsulfanylphenyl)-(4-piperidyl)methyl]pyridine (220 mg, 0.660 mmol), ammonium chloride (35 mg, 0.66 mmol) and zinc (238 mg, 3.64 mmol) in MeOH (6 mL) was stirred at 25° C. for 0.5 h. The mixture was filtered and concentrated under vacuum to give a residue, that was purified by prep-HPLC (basic condition) to yield 2-[(3-methylsulfanylphenyl)-(4-piperidyl)methyl]pyridine (160 mg, 81%) as colorless oil. MS (ESI): m/z=299.1 [M+H]+.
A solution of 2-[(3-methylsulfanylphenyl)-(4-piperidyl)methyl]pyridine (160 mg, 0.540 mmol) and (4-nitrophenyl) (4aR,8aS)-3-oxo-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazine-6-carboxylate (intermediate BB15a) (207 mg, 0.640 mmol) in pyridine (10 mL) was stirred at 90° C. for 16 h. The solution was filtered and concentrated under vacuum to give a residue, which was purified by prep-HPLC (TFA condition) to give (4aR,8aS)-6-[4-[(3-methylsulfanylphenyl)-(2-pyridyl)methyl]piperidine-1-carbonyl]-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazin-3-one (200 mg, 78%) as white solid. MS (ESI): m/z=481.2 [M+H]+.
A solution of tert-butyl 4-[phenyl(pyridazin-3-yl)methyl]piperidine-1-carboxylate (150 mg, 0.420 mmol) and trifluoroacetic acid (0.1 mL, 1.3 mmol) in DCM (3 mL) was stirred at 25° C. for 4 h. The solution was concentrated under vacuum to give a residue, which was purified by prep-HPLC (HCl condition) to yield 3-[phenyl(4-piperidyl)methyl]pyridazine (as HCl salt, 70 mg, quant.) as grey solid. MS (ESI): m/z=254.2 [M+H]+.
A solution of tert-butyl 4-(pyridazine-3-carbonyl)piperidine-1-carboxylate (CAS Nr. 2044281-15-2) (250 mg, 0.860 mmol) and phenylmagnesium bromide (3 M, 0.34 mL, 1.03 mmol) in THF (6 mL) was stirred at 0° C. for 3 h under N2. The solution was poured into brine (20 mL) and extracted with EtOAc (20 mL). The organic layer was concentrated under vacuum to give a residue, that was purified by prep-HPLC (TFA condition) to afford tert-butyl 4-(hydroxy-phenyl-pyridazin-3-yl-methyl)piperidine-1-carboxylate (200 mg, 63%) as grey solid. MS (ESI): m/z=314.1 [M-C4H8+H]+.
A mixture of tert-butyl 4-(hydroxy-phenyl-pyridazin-3-yl-methyl)piperidine-1-carboxylate (200 mg, 0.520 mmol) and sulfurous dichloride (306 mg, 2.59 mmol) in Tol (10 mL) was stirred at 25° C. for 6 h. The mixture was filtered and concentrated under vacuum to give tert-butyl 4-(chloro-phenyl-pyridazin-3-yl-methyl)piperidine-1-carboxylate (200 mg, 99%) as yellow solid, that was used as crude material in the next step. MS (ESI): m/z=410.2 [M+Na]+.
A solution of tert-butyl 4-(chloro-phenyl-pyridazin-3-yl-methyl)piperidine-1-carboxylate (200 mg, 0.52 mmol), ammonium chloride (28 mg, 0.52 mmol,) and zinc (185 mg, 2.84 mmol) in MeOH (4.7 mL) was stirred at 25° C. for 0.5 h. The mixture was concentrated under vacuum to give a residue, which was purified by prep-HPLC (TFA condition) to yield tert-butyl 4-[phenyl(pyridazin-3-yl)methyl]piperidine-1-carboxylate (150 mg, 82%) as yellow solid. MS (ESI): m/z=298.1 [M-C4H8+H]+.
A solution of tert-butyl 3-[4-(3-fluoropropyl)phenyl]azetidine-1-carboxylate (80 mg, 0.27 mmol) and trifluoroacetic acid (0.07 mL, 0.85 mmol) in DCM (2 mL) was stirred at 25° C. for 4 h. The mixture was concentrated under vacuum to give 3-[4-(3-fluoropropyl)phenyl]azetidine (40 mg, 76%) as colorless oil, which was used as such in the next step. MS (ESI): m/z=194.1 [M+H]+.
A solution of 1-bromo-4-(3-fluoropropyl)benzene (CAS Nr. 168104-62-9) (1.00 g, 4.61 mmol), bis(pinacolato)diboron (2.34 g, 9.21 mmol), [Pd(dppf)Cl2].CH2Cl2 (376 mg, 0.460 mmol) and KOAc (1.35 g, 13.8 mmol) in 1,4-dioxane (40 mL) was stirred at 100° C. for 16 h under N2. The mixture was filtered and concentrated to give a residue, that was purified by flash column chromatography (petroleum ether:EtOAc=10:1) to give 2-[4-(3-fluoropropyl)phenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (1.2 g, 99%) as colorless oil. MS (ESI): m/z=265.1 [M+H]+.
To a solution of 2-[4-(3-fluoropropyl)phenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (600 mg, 2.27 mmol) in H2O (12 mL) and acetone (60 mL) was added HCl (1M, 1 mL). The solution was stirred at 25° C. for 16 h. The solution was poured into brine (40 mL) and extracted with EtOAc (2×20 mL). The combined organic layers were concentrated under vacuum to give [4-(3-fluoropropyl)phenyl]boronic acid (300 mg, 73%) as light yellow solid. 1H NMR (400 MHz, CHLOROFORM-d) 8=8.19 (d, J=7.9 Hz, 2H), 7.37 (d, J=7.8 Hz, 2H), 4.52 (dt, J=47.2, 5.9 Hz, 2H), 2.87 (t, J=7.1 Hz, 2H), 2.16-2.02 (m, 2H).
A solution of [4-(3-fluoropropyl)phenyl]boronic acid (145 mg, 0.790 mmol), tert-butyl 3-iodoazetidine-1-carboxylate (CAS Nr. 254454-54-1) (150 mg, 0.530 mmol), nickel(II) iodide (99 mg, 0.32 mmol) (1S,2S)-2-aminocyclohexanol (37 mg, 0.32 mmol) and sodium bis(trimethylsilyl)amide (1.06 mL, 1.06 mmol) in 2-propanol (4 mL) was stirred at 80° C. for 1 h in a sealed tube. The mixture was filtered and concentrated under vacuum to give a residue, which was purified by prep-HPLC (TFA condition) to yield tert-butyl 3-[4-(3-fluoropropyl)phenyl]azetidine-1-carboxylate (82 mg, 46%) as colorless oil. MS (ESI): m/z=238.1 [M-C4H8+H]+.
Compound tert-butyl 3-[[(2,4-dichlorobenzoyl)amino]carbamoyl]azetidine-1-carboxylate (800.0 mg, 2.06 mmol) was suspended in polyphosphoric acid (5 mL), the mixture was stirred at 180° C. for 2 h. The mixture was poured into ice ammonia (100 mL), stirred for 10 min, then extracted three times with EtOAc (100 mL each), the combined organic phase was washed with brine, dried over Na2SO4 and concentrated. The residue was purified by reversed flash column chromatography (0.1% v/v FA) to give the desired product (130 mg, 17%) as a light brown oil. MS (ESI): m/z=270.4 [M+H]+.
To a solution of 1-Boc-azetidine-3-carboxylic acid (490.68 mg, 2.44 mmol, CAS RN 142253-55-2) and 2,4-dichlorobenzhydrazide (500.0 mg, 2.44 mmol, CAS RN 5814-06-2), DIPEA (1.27 mL, 7.32 mmol) in DMF (20 mL) was added T3P (1122.42 mg, 4.88 mmol, 50% in EtOAc), the mixture was stirred at 80° C. for 12 h. The mixture was diluted with EtOAc (50 mL), washed with NaHCO3 (100 mL) and brine, then dried over Na2SO4 and evaporated to give the crude product (800 mg, 84.5%) as a light brown oil. MS (ESI): m/z=332.4 [M-C4H8+H]+.
To a solution of tert-butyl 3-[1-(2,4-dichlorophenyl)pyrazol-3-yl]azetidine-1-carboxylate (350.0 mg, 0.950 mmol) in DCM (5 mL) was added TFA (1.0 mL, 0.950 mmol) and the mixture was stirred at 20° C. for 12 h. The mixture was concentrated to give the desired product as a yellow oil (350 mg, 96.4%). MS (ESI): m/z=268.1 [M+H]+.
To a solution of 1-BOC-azetidine-3-carboxylic acid (10.0 g, 49.7 mmol, CAS RN 142253-55-2) in DCM (200 mL) was added CDI (8.06 g, 49.7 mmol), the mixture was stirred at 20° C. for 1 h, then TEA (13.85 mL, 99.39 mmol) and O,N-dimethylhydroxylamine HCl salt (5.82 g, 59.64 mmol, CAS RN 6638-79-5) was added, the mixture was stirred at 20° C. for 15 h, then the mixture was washed with aqueous Na2CO3 and brine, dried over Na2SO4, filtered and the filtrate was concentrated to give crude product as light yellow oil (12 g) which was used in the next step without further purification.
To a solution of tert-butyl 3-[methoxy(methyl)carbamoyl]azetidine-1-carboxylate (1000.0 mg, 4.09 mmol) in THF (30 mL) was added MeMgBr/THF (1.77 mL, 3M) at 0° C., the mixture was stirred at 20° C. for 2 h, then the mixture was poured into sat. NH4C solution (100 mL) and extracted with EtOAc (30 mL three times), the combined organic phase was washed with brine, dried over Na2SO4, and concentrated to give the desired product as light yellow oil (810 mg, 99.3%). 1H NMR (400 MHz, CHLOROFORM-d) δ=4.05 (br d, J=7.4 Hz, 4H), 3.48-3.34 (m, 1H), 2.18 (d, J=2.0 Hz, 2H), 1.44 (d, J=2.0 Hz, 9H).
A solution of tert-butyl 3-acetylazetidine-1-carboxylate (500.0 mg, 2.51 mmol) in N,N-dimethylformamide dimethyl acetal (10.0 mL) was stirred at 110° C. for 12 h, the mixture was concentrated to give the title compound as yellow oil (640 mg, 2.52 mmol). MS (ESI): m/z=199.2 [M-C4H8+H]+.
A solution of tert-butyl 3-[(E)-3-(dimethylamino)prop-2-enoyl]azetidine-1-carboxylate (500.0 mg, 1.97 mmol) and 2,4-dichlorobenzohydrazide hydrochloride (474.78 mg, 1.97 mmol) in EtOH (30 mL) was stirred at 80° C. for 12 h, the mixture was concentrated, the residue was purified by silica gel column (PE:EtOAc=20:1 to 3:1) to give the desired product (450 mg, 62.2%) as yellow oil. MS (ESI): m/z=368.1 [M+H]+.
To a solution of tert-butyl 3-[4-(2,2-dimethylpropyl)phenyl]azetidine-1-carboxylate (500.0 mg, 1.65 mmol) in DCM (10 mL) was added TFA (2.0 mL) and the mixture was stirred at 20° C. for 12 h. The mixture was concentrated to give crude product as a light yellow oil (520 mg). MS (ESI): m/z=204.2 [M+H]+.
To a solution of 2,2-dimethylpropylbenzene (500.0 mg, 3.37 mmol, CAS RN 1007-26-7) in acetic acid (10 mL) was added bromine (0.17 mL, 3.37 mmol). The mixture was stirred at 20° C. in the dark for 12 h, and then the mixture was poured into sat. aq. Na2SO3 (30 mL) and extracted three times with EtOAc (10 mL each). The combined organic phases were washed with brine, dried over Na2SO4 and concentrated to give the crude product as alight yellow oil (600 mg, 78.3%) that was used in the next step without further purification.
To an 40 mL vial equipped with a stirring bar was added tert-butyl 3-bromoazetidine-1-carboxylate (519.75 mg, 2.2 mmol, CAS RN 1064194-10-0), 1-bromo-4-(2,2-dimethylpropyl)benzene (500.0 mg, 2.2 mmol), Ir[dF(CF3)ppy]2(dtbbpy)PF6 (24.68 mg, 0.020 mmol, CAS RN 870987-63-6), NiCl2glyme (2.42 mg, 0.010 mmol, CAS RN 29046-78-4), 4-tert-butyl-2-(4-tert-butyl-2-pyridyl)pyridine (3.54 mg, 0.010 mmol, CAS RN 69641-93-6), bis(trimethylsilyl)silyl-trimethyl-silane (547.37 mg, 2.2 mmol, CAS RN 1873-77-4) and Na2CO3 (466.63 mg, 4.4 mmol) then DME (20 mL). The vial was sealed and placed under nitrogen. The reaction mixture was stirred and irradiated with a 34 W blue LED lamp (7 cm distance), with cooling fan to keep the reaction temperature at 25° C. for 14 h. The mixture was filtered and the filtrate was concentrated. The residue was purified by reversed flash (0.1% v/v FA) to give desired product (500 mg, 74.8%) as a light yellow oil. MS (ESI): m/z=248.2 [M-C4H8+H]+.
To a solution of (4aR,8aS)-6-[3-(4-bromophenyl)azetidine-1-carbonyl]-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazin-3-one (200.0 mg, 0.510 mmol, Example 110) and PdCl2(dppf).DCM (35.56 mg, 0.050 mmol) was added potassium acetate (149.36 mg, 1.52 mmol) and bis(pinacolato)diboron (193.23 mg, 0.760 mmol), the reaction mixture was purged with nitrogen and stirred at 90° C. for 12 h. The reaction mixture was diluted with water and extracted three times with EtOAc. The combined organic layers were washed with water and brine, dried over sodium sulfate and concentrated in vacuum to get yellow residue, which was purified by reverse flash chromatography (0.1% v/v FA) to provide the desired product (140 mg, 0.320 mmol, 62.5%) as light yellow solid. MS (ESI): m/z=442.3 [M+H]+.
To a solution of 2-bromo-5-methylbenzoic acid (500.0 mg, 2.33 mmol, CAS RN 6967-82-4) and HOBT (534.11 mg, 3.49 mmol), EDCI (541.43 mg, 3.49 mmol) and DIPEA (1.21 mL, 6.98 mmol) in DMF (10 mL) was added ethylamine hydrochloride (227.51 mg, 2.79 mmol) and the mixture was stirred at 20° C. for 12 h. Then the mixture was poured into sat. aq. Na2CO3 solution (50 mL) and extracted three times with EtOAc (20 mL each). The combined organic layers were washed with brine and dried over Na2SO4 and concentrated to give the desired product as light yellow solid (450 mg, 79.9%). MS (ESI): m/z=242.0 [M+H]+.
A dried 100 mL two-neck round-bottom flask with equipped reflux condenser under argon was charged with THF (18.6 mL) and 1-(tert-butyl) 3-methyl azetidine-1,3-dicarboxylate (800 mg, 746 μL, 3.72 mmol, CAS RN 610791-05-4). The mixture was purged with argon for 5 min and cooled to 0° C. Then, (4-fluorophenyl)magnesium bromide, 0.8 M solution in THF (18.6 mL, 14.9 mmol) was added over 10 min. After complete addition the reaction mixture was heated to 85° C. (oil bath) for 17 h. The reaction was quenched with water (5 mL), diluted with EtOAc (10 mL) and the resulting slurry was stirred for 15 min. Water was added and the mixture was acidified with 2 M HCl (20 mL) until the aq. phase became a colorless solution. The phases were separated and the aqueous phase was extracted with EtOAc (100 mL). The pH was adjusted to 7 and the aqueous phase was extracted four times with EtOAc. The combined organic layers were concentrated to about 50 mL. A precipitate formed and the flask was cooled to 4° C. The precipitate was filtered and the white solid was washed with small portions of EtOAc to yield the title compound (317 mg, 31%). MS (ESI): m/z=276.2 [M+H]+.
Trifluoroacetic acid (400 mg, 270 μL, 3.51 mmol) was added to a solution of tert-butyl 3-(1-(2-chloro-4-(trifluoromethyl)phenoxy)ethyl)azetidine-1-carboxylate (78.4 mg, 206 μmol) in DCM (1.03 mL) and the solution was stirred at RT for 2 h. The solvent was removed under reduced pressure to afford the compound as a light-yellow oil (134 mg, 100%.The crude product was used in the next step without further purification. MS (ESI): m/z=280.1 [M+H]+.
To a solution of 2-chloro-4-(trifluoromethyl)phenol (500 mg, 340 μL, 2.54 mmol), tert-butyl 3-(1-hydroxyethyl)azetidine-1-carboxylate (512 mg, 2.54 mmol, CAS RN 1138331-90-4) and triphenylphosphine (734 mg, 2.8 mmol) in DCM (12.7 mL) was added DIAD (566 mg, 544 μL, 2.8 mmol) dropwise at 0° C. and the reaction was stirred at 0° C. for 10 min and at RT for 6 h. The reaction mixture was quenched by addition of sat. aq. NaHCO3 solution (20 mL). The phases were separated and the aq. phase was extracted with DCM twice. The combined organic layers were dried over Na2SO4, filtered and stored at 4° C. for four days. The crude product was concentrated to dryness, immobilized on Isolute® and purified by flash column chromatography (eluting with a gradient of 0 to 30% EtOAc in n-heptane) to afford the title compound as a pale oil (497 mg, 48.9%). MS (ESI): m/z=324.1 [M-C4H8+H]+.
Hydrochloric acid (4M in dioxane) (174 μL, 695 μmol) was added to a solution of tert-butyl 4-(1-(2-chloro-4-fluorophenoxy)-2,2,2-trifluoroethyl)piperidine-1-carboxylate (17.9 mg, 43.5 μmol) in dioxane (435 μL) and the solution was stirred for 2 h at RT. The solvent was removed under reduced pressure to afford the desired compound as a light-yellow oil (15 mg, 95%). The crude product was used in the next step without further purification. MS (ESI): m/z=312.1 [M+H]+.
Tert-butyl 4-(2,2,2-trifluoro-1-(((trifluoromethyl)sulfonyl)oxy)ethyl)piperidine-1-carboxylate (126 mg, 303 μmol), 2-chloro-4-fluorophenol (48.9 mg, 36.4 μL, 334 μmol) and cesium carbonate (109 mg, 334 μmol) were suspended in DMF (1.52 mL) and stirred at RT for 20 h. The reaction mixture was then quenched with water and extracted two times with EtOAc. The combined organic phases were washed with water and brine, dried over MgSO4 and concentrated in vacuo. The residue was immobilized on Isolute® and purified by flash column chromatography (0 to 30% gradient EtOAc in n-heptane) to afford the title compound as a colourless oil (20 mg, 15%). MS (ESI): m/z=356.1 [M-C4H8+H]+.
A microwave vial was charged with tert-butyl 4-(2,2,2-trifluoro-1-hydroxyethyl)piperidine-1-carboxylate (100 mg, 353 μmol, CAS RN 184042-83-9). The vial was placed under argon, DCM (1.76 mL) was added and cooled to 0° C. Pyridine (33.5 mg, 34.3 μL, 424 μmol) was added, followed by triflic anhydride (110 mg, 65.6 μL, 388 μmol). The reaction mixture was stirred at 0° C. for 1 h and then quenched with water. The mixture was separated and the organic phase was washed with water and extracted three times with DCM. The combined organic layers were washed with brine, dried over MgSO4 and concentrated in vacuo affording the desired compound as a yellow oil (126 mg, 85.9%). The compound was used in the next step without further purification.
A solution of 3-(bis(4-fluorophenyl)methylene)azetidine (20 mg, 77.7 μmol) in MeOH (777 μL) was evacuated and back-filled with argon five times. Under an argon atmosphere, Pd—C (4.14 mg, 3.89 μmol) was added, and the atmosphere was replaced with hydrogen three times. The reaction was stirred under a hydrogen atmosphere (balloon) at 1 bar for 19 h. The atmosphere was replaced with argon and the reaction mixture was filtered over a pad of Dicalite. The filter cake was washed with MeOH. The filtrate was concentrated to give the desired compound as a yellow solid (20.1 mg, 94.7%) which was used in the next step without further purification. MS (ESI): m/z=260.2 [M+H]+.
To a suspension of azetidin-3-ylbis(4-fluorophenyl)methanol (244 mg, 886 μmol, BB93) in DCM (2.22 mL) was added TFA (2.22 mL) and the mixture was stirred for 3.5 h. This afforded a homogeneous solution. The reaction was evaporated to dryness, the resulting residue diluted with EtOAc, washed twice with saturated aqueous sodium bicarbonate solution, then with brine, dried over Na2SO4 and filtered. The filtrate was concentrated in vacuo to dryness and the residue was triturated with EtOAc/n-heptane and filtered. This afforded the title compound as a white solid (20 mg, 8.3%). MS (ESI): m/z=258.2 [M+H]+.
To a solution of tert-butyl 3-(1-(2-fluoro-4-(trifluoromethyl)phenoxy)ethyl)azetidine-1-carboxylate (93 mg, 256 μmol) in DCM (1 mL) was added 2,2,2-trifluoroacetic acid (467 mg, 316 μL, 4.1 mmol) and the reaction was stirred at RT for 20 h. The reaction mixture was concentrated to afford the desired compound as a colorless oil (112.8 mg, 99%) which was used in the next step without further purification. MS (ESI): m/z=264.1 [M+H]+.
To a solution of 2-fluoro-4-(trifluoromethyl)phenol (100 mg, 69.9 μL, CAS RN 77227-78-2), tert-butyl 3-(1-hydroxyethyl)azetidine-1-carboxylate (112 mg, 555 μmol, CAS RN 1138331-90-4) and triphenylphosphine (160 mg, 611 μmol) in DCM (2.8 mL) was added DIAD (124 mg, 119 μL, 611 μmol) dropwise and the reaction was stirred at RT for 1.5 h. The reaction mixture was quenched by addition of sat. aq. NaHCO3 solution. The phases were separated and the aqueous phase was extracted with DCM. The combined organic layers were dried over Na2SO4, filtered and concentrated in vacuo. The residue was immobilized on Isolute and purified by flash column chromatography (0 to 20% gradient of EtOAc in n-heptane) to afford the desired compound as a colorless oil (93 mg, 43.8%). MS (ESI): m/z=308.1 [M-C4H8+H]+.
In analogy to BB97, BB98 was generated from 4-(trifluoromethyl)phenol and tert-butyl 3-(1-hydroxyethyl)azetidine-1-carboxylate. The compound was used in the next step without further purification.
A solution of 4-[(4-fluorophenyl)-(3-methoxyphenyl)methyl]piperidine (760 mg, 2.54 mmol) in MeOH (5 mL) was purified by SFC separation to afford 4-[(S or R)-(4-fluorophenyl)-(3-methoxyphenyl)methyl]piperidine (128 mg, 0.43 mmol, 17%) as light yellow semisolid; MS (ESI): m/z=300.1 [M+H]+; and 4-[(R or S)-(4-fluorophenyl)-(3-methoxyphenyl)methyl]piperidine (170 mg, 0.57 mmol, 22%) as light yellow semisolid; MS (ESI): m/z=300.1 [M+H]+.
To a solution of 3-bromoanisole (487 mg, 2.6 mmol) in THF (40 mL) was added butyllithium (1.5 mL, 3.75 mmol, 2.5 M) at −78° C. After stirring for 1 h, tert-butyl 4-(4-fluorobenzoyl)piperidine-1-carboxylate (CAS RN 160296-40-2; 800 mg, 2.6 mmol) was added to the mixture and stirring was continued at −78° C. for 1 h. Then the reaction was warmed to 25° C. and stirred for another 13 h. The reaction was quenched with NH4Cl (sat. aq., 50 mL) and extracted with EtOAc (100 mL). The organic layer was separated, dried over Na2SO4, filtered and concentrated under vacuum to afford the desired compound (1100 mg, 63%) as yellow oil. MS (ESI): m/z=438.1 [M+Na]+.
A solution of tert-butyl 4-[(4-fluorophenyl)(hydroxy)(3-methoxyphenyl)methyl]piperidine-1-carboxylate (1.1 g, 1.64 mmol) and trifluoroacetic acid (5.0 mL, 65 mmol) in DCM (10 mL) was stirred at 25° C. for 5 h. The reaction was concentrated under vacuum. The residue was dissolved in EtOAc (50 mL) and washed with Na2CO3 (aq., 10%, 50 mL). The organic layer was separated, dried with over Na2SO4, filtered and concentrated under vacuum. The resulting oil was purified by preparative HPLC (TFA as additive) to afford 4-[(4-fluorophenyl)(3-methoxyphenyl)methylene]piperidine (TFA salt, 430 mg, 39%) as a white solid. MS (ESI): m/z=298.1 [M+H]+.
A solution of 4-[(4-fluorophenyl)(3-methoxyphenyl)methylene]piperidine (410 mg, 1.38 mmol) and Pd/C (100 mg, 1.38 mmol) in THF (10 mL) was stirred at 25° C. for 16 h under H2 (760 mm Hg). The reaction mixture was filtered through the Celite, then concentrated under vacuum to afford 4-[(4-fluorophenyl)(3-methoxyphenyl)methyl]piperidine (TFA salt, 260 mg, 59%) as yellow oil. MS (ESI): m/z=300.1 [M+H]+.
A solution of 4-[(4-fluorophenyl)-(3-methoxyphenyl)methyl]piperidine (BB99, intermediate c, 760 mg, 2.54 mmol) in MeOH (5 mL) was purified by SFC separation to afford 4-[(S or R)-(4-fluorophenyl)-(3-methoxyphenyl)methyl]piperidine (128 mg, 17%) as light yellow semisolid; LCMS: 300.1 [M+H]+; and 4-[(R or S)-(4-fluorophenyl)-(3-methoxyphenyl)methyl]piperidine or 4-[(S)-(4-fluorophenyl)-(3-methoxyphenyl)methyl]piperidine (170 mg, 22%) as light yellow semisolid; MS (ESI): m/z=300.1 [M+H]+.
A solution of 4-[(3-methoxyphenyl)-phenyl-methyl]piperidine (960 mg, 3.41 mmol) in MeOH (5 mL) was purified by preparative HPLC using TFA as additive to afford 4-[-(3-methoxyphenyl)-phenyl-methyl]piperidine as its TFA salt (1260 mg). 4-[-(3-methoxyphenyl)-phenyl-methyl]piperidine TFA salt (1260 mg) was purified by SFC separation to afford (S or R)-4-((3-methoxyphenyl)(phenyl)methyl)piperidine (443 mg, 45%) as light yellow solid; MS (ESI): m/z=282.2 [M+H]+; and (R or S)-4-((3-methoxyphenyl)(phenyl)methyl)piperidine (383 mg, 39%) as yellow solid; MS (ESI): m/z=282.2 [M+H]+.
The title compound was prepared in analogy to intermediate 1-[(4-fluorophenyl)-phenyl-methyl]piperazine (CAS RN 27064-89-7), starting from 3-bromoanisole and tert-butyl 4-benzoylpiperidine-1-carboxylate (CAS RN 922504-27-6) to give the title compound as light yellow semisolid. MS (ESI): m/z=282.1 [M+H]+.
A solution of 4-[(3-methoxyphenyl)-phenyl-methyl]piperidine (BB101, intermediate, 960 mg, 3.41 mmol) in MeOH (5 mL) was purified by preparative HPLC using TFA as additive to afford 4-[-(3-methoxyphenyl)-phenyl-methyl]piperidine as its TFA salt (1260 mg). 4-[-(3-Methoxyphenyl)-phenyl-methyl]piperidine TFA salt (1260 mg) was purified by SFC separation to afford (S or R)-4-((3-methoxyphenyl)(phenyl)methyl)piperidine (443 mg, 45%) as light yellow solid; MS (ESI): m/z=282.2 [M+H]+; and (R or S)-4-((3-methoxyphenyl)(phenyl)methyl)piperidine (383 mg, 39%) as yellow solid; MS (ESI): m/z=282.2 [M+H]+.
A solution of 4-[[3-(2-fluoroethoxy)phenyl]-phenyl-methyl]piperidine (800 mg, 2.55 mmol) in MeOH (5 mL) was purified by SFC separation to afford (S or R)-4-((3-(2-fluoroethoxy)phenyl)(phenyl)methyl)piperidine (214 mg, 27%) as white solid; MS (ESI): m/z=314.1 [M+H]+; and (R or S)-4-((3-(2-fluoroethoxy)phenyl)(phenyl)methyl)piperidine (305 mg, 38%) as white solid; MS (ESI): m/z=314.1 [M+H]+.
The title compound was prepared in analogy to intermediate 1-[(4-fluorophenyl)-phenyl-methyl]piperazine (CAS RN 27064-89-7), starting from 1-bromo-3-(2-fluoroethoxy)benzene (CAS RN 132837-02-6) and tert-butyl 4-benzoylpiperidine-1-carboxylate (CAS RN 922504-27-6) to give the title compound as colorless oil. MS (ESI): m/z=314.1 [M+H]+.
A solution of 4-[(4-fluorophenyl)-phenyl-methyl]piperidine TFA salt (690 mg, 1.8 mmol) in MeOH (10 mL) was purified by SFC separation to afford (S or R)-4-((4-fluorophenyl)(phenyl)methyl)piperidine (172 mg, 35%) as light yellow solid; MS (ESI): m/z=270.1 [M+H]+; and (R or S)-4-((4-fluorophenyl)(phenyl)methyl)piperidine. (R or S)-4-((4-Fluorophenyl)(phenyl)methyl)piperidine was dissolved in EtOAc (15 mL) and washed with Na2CO3 (5 mL, aq., 30%) and water (5 mL). The organic layer was separated, dried over Na2SO4, filtered and concentrated under vacuum. The residue was lyophilized to give (R or S)-4-((4-fluorophenyl)(phenyl)methyl)piperidine (227 mg, 46%) as light yellow solid. MS (ESI): m/z=270.1 [M+H]+.
To a solution of 4-bromofluorobenzene (2 g, 11.4 mmol) in THF (20 mL) cooled to −78° C., was added n-butyllithium dropwise (5.81 mL, 14.51 mmol) and the reaction mixture was stirred for 30 min. Then, a solution of tert-butyl 4-benzoylpiperidine-1-carboxylate (CAS RN 922504-27-6; 3 g, 10.37 mmol) in THF (15 mL) was added to the mixture which was stirred at −78° C. for 2 hours. The mixture was allowed to warm up to RT, poured into a solution of sat. aqueous NH4Cl solution (50 mL) and extracted with EtOAc. The combined organic layers were dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified preparative HPLC (Gemini NX column) to give the title compound (1.18 g, 29%) as colorless solid. MS: 312.1 [M-C4H8—H2O+H]+.
To a solution of tert-butyl 4-[(4-fluorophenyl)-hydroxy-phenyl-methyl]piperidine-1-carboxylate (0.7 g, 1.82 mmol) in DCM (10 mL) was added trifluoroacetic acid (1.4 mL, 18.16 mmol) and the reaction was stirred at RT for 8 h. The mixture was concentrated in vacuo to give the crude title compound (0.3 g, 62%) as a light yellow solid. MS: 268.0 [M+H]+.
A solution of 4-[(4-fluorophenyl)-phenyl-methylene]piperidine (1600 mg, 5.98 mmol) and Pd/C (300 mg, 5.98 mmol) in THF (100 mL) was stirred at RT for 16 h under H2 atmosphere (760 mm Hg). The suspension was filtered and the filtrate concentrated in vacuo. The residue was purified by preparative HPLC using TFA as additive to obtain the title compound as 2,2,2-trifluoroacetic acid salt (700 mg, 29%) as white solid. MS (ESI): m/z=270.1 [M+H]+.
A solution of 4-[(4-fluorophenyl)-(p-tolyl)methyl]piperidine (870 mg, 3.07 mmol) was separated by SFC (Method: Column DAICEL CHIRALPAK AD 250 mm*30 mm, 5 μm, Condition 0.1% NH3.H2O IPA, Begin B 35, End B 35, Gradient Time (min) 4.9 min; 110 min, 100% B Hold Time (min) 0; FlowRate (mL/min) 60) to afford (R or S)-4-[(4-fluorophenyl)(p-tolyl)methyl]piperidine (253 mg, 28%; MS (ESI): m/z=284.1 [M+H]+) and (S or R)-4-[(4-fluorophenyl)(p-tolyl)methyl]piperidine (356 mg, 40% yield; MS (ESI): m/z=284.1 [M+H]+).
To a stirred solution at −78° C. of 4-bromotoluene (1.70 g, 9.94 mmol) in THF (40 mL) was added a butyllithium solution (5.57 mL, 13.9 mmol). After stirring for 1 h, tert-butyl 4-(4-fluorobenzoyl)piperidine-1-carboxylate (CAS RN 160296-40-2; 3.05 g, 9.94 mmol) was added to the mixture and stirring was continued at −78° C. for 1 h. Then the reaction was warmed to 25° C. and stirred for another 13 h. The reaction was quenched with NH4Cl (sat. aq., 50 mL) and extracted with EtOAc (100 mL). The organic layer was separated, dried with over Na2SO4, filtered and concentrated under vacuum to afford the desired compound as a light yellow oil (2.85 g, 71%). MS (ESI): m/z=422.1 [M+Na]+.
A solution of tert-butyl 4-[(4-fluorophenyl)-hydroxy-(p-tolyl)methyl]piperidine-1-carboxylate (2.83 g, 7.08 mmol) and trifluoroacetic acid (11 mL, 142 mmol) in DCM (20 mL) was stirred at 25° C. for 3 h. The reaction was concentrated under vacuum. The residue was purification by prep-HPLC (TFA as additive) to afford the title compound as light-yellow semisolid (1.36 mg, 67%). MS (ESI): m/z=282.1 [M+H]+.
A solution of 4-[(4-fluorophenyl)-(p-tolyl)methylene]piperidine (1.36 g, 4.83 mmol) and Pd/C (300 mg) in DMF (50 mL) was stirred at 25° C. for 16 h under H2 (2280 mm Hg). The reaction solution was filtered through Celite and concentrated under vacuum. The residue was purified by prep-HPLC (TFA as additive) to afford the desired compound as white semisolid (TFA salt, 870 mg, 45%). MS (ESI): m/z=284.1 [M+H]+.
A solution of 4-[[4-(2-fluoroethoxy)phenyl]-phenyl-methyl]piperidine (800 mg, 2.55 mmol) in MeOH (5 mL) was purified and the enantiomers separated by SFC to afford (S or R)-4-[[4-(2-fluoroethoxy)phenyl]-phenyl-methyl]piperidine (279 mg, 0.89 mmol, 35%) as white solid; MS (ESI): m/z=314.2 [M+H]+; and (R or S)-4-[[4-(2-fluoroethoxy)phenyl]-phenyl-methyl]piperidine (373 mg, 47%) as white solid. MS (ESI): m/z=314.1 [M+H]+.
The title compound was prepared in analogy to intermediate 1-[(4-fluorophenyl)-phenyl-methyl]piperazine (CAS RN 27064-89-7), starting from 1-bromo-4-(2-fluoroethoxy)benzene (CAS RN 332-47-8) and tert-butyl 4-benzoylpiperidine-1-carboxylate (CAS RN 922504-27-6) to give the title compound as colorless oil. MS (ESI): m/z=314.1 [M+H]+.
A solution of 4-[(4-fluorophenyl)-(4-methoxyphenyl)methyl]piperidine (930 mg, 3.11 mmol) in MeOH (5 mL) was purified by SFC separation to afford (S or R)-4-[(4-fluorophenyl)-(4-methoxyphenyl)methyl]piperidine (277 mg, 0.93 mmol, 27%) as light yellow semisolid; MS (ESI): m/z=300.1 [M+H]+; and (R or S)-4-[(4-fluorophenyl)-(4-methoxyphenyl)methyl]piperidine (291 mg, 30%) as light yellow semisolid; MS (ESI): m/z=300.1 [M+H]+.
The title compound was prepared in analogy to intermediate 1-[(4-fluorophenyl)-phenyl-methyl]piperazine (CAS RN 27064-89-7), starting from 1-bromo-4-methoxy-benzene (CAS RN 104-92-7) and tert-butyl 4-benzoylpiperidine-1-carboxylate (CAS RN 922504-27-6) to give the title compound as colorless semisolid. MS (ESI): m/z=300.1 [M+H]+.
A solution of 4-[(4-fluorophenyl)-(p-tolyl)methyl]piperidine (870 mg, 3.07 mmol, BB105, intermediate c) was separated by SFC (Method: Column DAICEL CHIRALPAK AD 250 mm*30 mm, 5 μm, Condition 0.1% NH3.H2O IPA, Begin B 35, End B 35, Gradient Time (min) 4.9 min; 110 min, 100% B Hold Time (min) 0; FlowRate (mL/min) 60) to afford (R or S)-4-[(4-fluorophenyl)(p-tolyl)methyl]piperidine (253 mg, 28%).; MS (ESI): m/z=284.1 [M+H]+; and (S or R)-4-[(4-fluorophenyl)(p-tolyl)methyl]piperidine (356 mg, 40%). MS (ESI): m/z=284.1 [M+H]+.
4-((3,4-Dimethoxyphenyl)(4-fluorophenyl)methyl)piperidine (900 mg) was separated by SFC (Method: Column DAICEL CHIRALPAK AD (250 mm*50 mm, 10 μm), Condition 0.1% NH3.H2O MeOH, Begin B 25, End B 25 Gradient Time (min) 5.5 min:900 min, 100% B Hold Time (min) 0, FlowRate (mL/min) 50 g/min) to give (S or R)-4-((3,4-dimethoxyphenyl)(4-fluorophenyl)methyl)piperidine (278 mg, 29% d). MS (ESI): m/z=330.3 [M+H]+ and (R or S)-4-((3,4-dimethoxyphenyl)(4-fluorophenyl)methyl)piperidine (426 mg, 44%; MS (ESI): m/z=330.1 [M+H]+) as a off-white solids.
To a solution of 4-bromoveratrole (CAS RN 2859-78-1; 1.27 g, 5.86 mmol) in THF (30 mL) was added dropwise butyllithium (3.28 mL, 8.2 mmol) with stirring at −78° C. Stirring was continued at −78° C. for 1 h. Then tert-butyl 4-(4-fluorobenzoyl)piperidine-1-carboxylate (CAS RN 160296-40-2; 1.80 g, 5.86 mmol) was added and the mixture was stirred at −78° C. for 5 h. The mixture was poured into brine (50 mL) and extracted twice with EtOAc (30 mL each). The combined organic layers were concentrated in vacuo to give the desired compound as a colorless oil (2.4 g, 91%). MS (ESI): m/z=468.4 [M+Na]+.
A mixture of tert-butyl 4-((3,4-dimethoxyphenyl)(4-fluorophenyl)(hydroxy)methyl)piperidine-1-carboxylate (2.4 g, 5.4 mmol) and trifluoroacetic acid (4.15 mL, 53.87 mmol) in DCM (20 mL) was stirred at 25° C. for 4 h. The reaction mixture was concentrated in vacuo to give 4-((3,4-dimethoxyphenyl)(4-fluorophenyl)methylene)piperidine (TFA salt, 1.7 g, 96%) as brown oil. MS (ESI): m/z=328.3 [M+H]+.
A mixture of 4-((3,4-dimethoxyphenyl)(4-fluorophenyl)methylene)piperidine (1.7 g, 5.2 mmol, BB109, intermediate b) and Pd/C (276 mg, 0.260 mmol) in THF (10 mL) was stirred at 25° C. for 16 h under H2 (760 mm Hg). The mixture was filtered and concentrated in vacuo to give a residue, which was purified by preparative HPLC (TFA conditions) to give 4-((3,4-dimethoxyphenyl)(4-fluorophenyl)methyl)piperidine (900 mg, 52%) as white solid. MS (ESI): m/z=330.3 [M+H]+.
A solution of 4-[(3,4-dimethoxyphenyl)-phenyl-methyl]piperidine (900 mg, 2.89 mmol) in MeOH (5 mL) was purified by SFC separation to afford (S or R)-(3,4-dimethoxyphenyl)-phenyl-methyl]piperidine (326 mg, 36%) as white solid; MS (ESI): m/z=312.3 [M+H]+; and (R or S)-(3,4-dimethoxyphenyl)-phenyl-methyl]piperidine (222 mg, 24%) as white solid; MS (ESI): m/z=312.3 [M+H]+.
The title compound was prepared in analogy to intermediate 1-[(4-fluorophenyl)-phenyl-methyl]piperazine (CAS RN 27064-89-7), starting from 4-bromo-1,2-dimethoxy-benzene (CAS RN 2859-78-1) and tert-butyl 4-benzoylpiperidine-1-carboxylate (CAS RN 922504-27-6) to give the title compound as a white solid. MS (ESI): m/z=312.3 [M+H]+.
A solution of 4-[(4-fluorophenyl)-phenyl-methyl]piperidine TFA salt (690 mg, 1.8 mmol) in MeOH (10 mL) was purified by SFC separation to afford (S or R)-4-((4-fluorophenyl)(phenyl)methyl)piperidine (172 mg, 35%) as a light yellow solid. MS (ESI): m/z=270.1 [M+H]+; and (R or S)-4-((4-fluorophenyl)(phenyl)methyl)piperidine. (R or S)-4-((4-Fluorophenyl)(phenyl)methyl)piperidine was dissolved in EtOAc (15 mL) and washed with aqueous Na2CO3 solution (5 mL, 30%) and water (5 mL). The organic layer was separated, dried over Na2SO4, filtered and concentrated under vacuum. The residue was lyophilized to give (R or S)-4-((4-fluorophenyl)(phenyl)methyl)piperidine (227 mg, 0.84 mmol, 46%) as light yellow solid; MS (ESI): m/z=270.1 [M+H]+.
A solution of 4-(phenyl(m-tolyl)methyl)piperidine (730 mg, 2.75 mmol) in MeOH (5 mL) was purified by SFC separation to afford (S or R)-4-(phenyl(m-tolyl)methyl)piperidine (221 mg, 0.83 mmol, 30%) as yellow semisolid. MS (ESI): m/z=266.2 [M+H]+; and (R or S)-4-(phenyl(m-tolyl)methyl)piperidine (228 mg, 31%) as yellow semisolid. MS (ESI): m/z=266.2 [M+H]+.
The title compound was prepared in analogy to intermediate 1-[(4-fluorophenyl)-phenyl-methyl]piperazine (CAS RN 27064-89-7), starting from 1-bromo-3-methyl-benzene (CAS RN 591-17-3) and tert-butyl 4-benzoylpiperidine-1-carboxylate (CAS RN 922504-27-6) to give the title compound as a light yellow solid. MS (ESI): m/z=266.1 [M+H]+.
A solution of 4-[[4-(2-fluoroethoxy)phenyl]-phenyl-methyl]piperidine (BB106, intermediate; 800 mg, 2.55 mmol) in MeOH (5 mL) was purified and the enantiomers separated by SFC separation to afford (S or R)-4-[[4-(2-fluoroethoxy)phenyl]-phenyl-methyl]piperidine (279 mg, 35%) as white solid, MS (ESI): m/z=314.2 [M+H]+; and (R or S)-4-[(S)-[4-(2-fluoroethoxy)phenyl]-phenyl-methyl]piperidine (373 mg, 47%) as white solid; MS (ESI): m/z=314.1 [M+H]+.
A solution of 4-(phenyl(m-tolyl)methyl)piperidine (BB112, intermediate, 730 mg, 2.75 mmol) in MeOH (5 mL) was purified and the enantiomers separated using SFC to afford (S or R)-4-(phenyl(m-tolyl)methyl)piperidine (221 mg, 30%) as yellow semisolid; MS (ESI): m/z=266.2 [M+H]+; and (R or S)-4-(phenyl(m-tolyl)methyl)piperidine (228 mg, 31%) as yellow semisolid. MS (ESI): m/z=266.2 [M+H]+.
A solution of 4-(phenyl(p-tolyl)methyl)piperidine (720 mg, 2.71 mmol) in MeOH (5 mL) was purified and the enantiomers separated using SFC to afford ((S or R)-4-(phenyl(p-tolyl)methyl)piperidine (277 mg, 35%) as off-white solid; MS (ESI): m/z=266.2 [M+H]+; and (R or S)-4-(phenyl(p-tolyl)methyl)piperidine (313 mg, 43%) as off-white solid; MS (ESI): m/z=266.2 [M+H]+.
The title compound was prepared in analogy to intermediate 1-[(4-fluorophenyl)-phenyl-methyl]piperazine (CAS RN 27064-89-7), starting from 1-bromo-4-methyl-benzene (CAS RN 106-38-7) and tert-butyl 4-benzoylpiperidine-1-carboxylate (CAS RN 922504-27-6) to give the title compound as white solid, MS (ESI): m/z=266.2 [M+H]+.
A solution of 4-(phenyl(p-tolyl)methyl)piperidine (BB117, intermediate, 720 mg, 2.71 mmol) in MeOH (5 mL) was purified and the enantiomers separated using SFC to afford ((S or R)-4-(phenyl(p-tolyl)methyl)piperidine (277 mg, 1.04 mmol, 35%) as off-white solid; MS (ESI): m/z=266.2 [M+H]+; and (R or S)-4-(phenyl(p-tolyl)methyl)piperidine (313 mg, 1.18 mmol, 43%) as off-white solid; MS (ESI): m/z=266.2 [M+H]+.
A solution of 3-(diphenylmethylene)azetidine (800 mg, 3.62 mmol) and Pd/C (1923 mg) in THF (20 mL) was stirred at 25° C. under H2 atmosphere (760 mm Hg) for 5 h. The solution was filtered and concentrated in vacuo to give a residue, which was purified by preparative HPLC (TFA condition) to give 3-benzhydrylazetidine (315 mg, 37%) as white solid. MS (ESI): m/z=224.1 [M+H]+.
A mixture of 1-boc-azetidine-3-carboxylic acid (CAS RN 142253-55-2; 50 g, 248 mmol), triethylamine (69.3 mL, 497 mmol), 1-hydroxybenzotriazole (33.5 g, 248 mmol) and EDCl (47.6 g, 248 mmol) and O,N-dimethylhydroxylamine hydrochloride (24.24 g, 248.5 mmol) in DMF (1000 mL) was stirred at 25° C. for 16 h. The mixture was concentrated in vacuo to give a residue, which was neutralized by HCl (1M) to pH=7 and extracted three times with EtOAc (200 mL each). The combined organic layers were washed twice with 200 mL aqueous NaHCO3 solution, dried over Na2SO4 and concentrated in vacuo to give tert-butyl 3-[methoxy(methyl)carbamoyl]azetidine-1-carboxylate (55 g, 72%) as colorless oil. MS (ESI): m/z=189.1 [M-C4H8+H]+.
To a solution of tert-butyl 3-[methoxy(methyl)carbamoyl]azetidine-1-carboxylate (55 g, 225 mmol) in THF (600 mL) was added phenylmagnesium bromide (82 mL, 248 mmol) with stirring at 0° C. and then the solution was stirred at 0° C. for 3 h. The solution was poured into sat.aq. NH4Cl solution (300 mL) and extracted twice with EtOAc (150 mL each). The combined organic layers were dried over Na2SO4, filtered and concentrated in vacuo to give a residue, which was purified by column chromatography (petroleum ether:EtOAc 10:1) to give the desired compound as light yellow solid (28 g, 46%). MS (ESI): m/z=206.1 [M-C4H8+H]+.
A solution of phenylmagnesium bromide (3.06 mL, 9.18 mmol) and tert-butyl 3-benzoylazetidine-1-carboxylate (2.0 g, 7.65 mmol) in THF (20 mL) was stirred at 0° C. for 2 h. The solution was quenched by addition of sat. aq. NH4Cl solution (50 mL) and extracted twice with EtOAc (20 mL each). The combined organic layers were concentrated in vacuo to give a residue, which was purified by flash column chromatography (PE:EtOAc 5:1) to afford the desired compound as white solid (1.03 g, 39%). MS (ESI): m/z=362.2 [M+Na]+.
A solution of tert-butyl 3-(hydroxydiphenylmethyl)azetidine-1-carboxylate (1.00 g, 2.95 mmol) and TFA (2.27 mL, 29.5 mmol) in DCM (15 mL) was stirred at 25° C. for 4 h. The solution was concentrated in vacuo to provide the title compound as brown oil (TFA salt, 650 mg, 99%). MS (ESI): m/z=222.1 [M+H]+.
A solution of 4-[(3,4-dimethoxyphenyl)-phenyl-methyl]piperidine (BB110, intermediate; 900 mg, 2.89 mmol) in MeOH (5 mL) was purified and the enantiomers separated using SFC to afford (S or R)-(3,4-dimethoxyphenyl)-phenyl-methyl]piperidine (326 mg, 1.05 mmol, 36%) as white solid; MS (ESI): m/z=312.3 [M+H]+; and (R or S)-(3,4-dimethoxyphenyl)-phenyl-methyl]piperidine (222 mg, 0.71 mmol, 24%) as white solid. MS (ESI): m/z=312.3 [M+H]+.
4-((3,4-Dimethoxyphenyl)(4-fluorophenyl)methyl)piperidine (BB109, intermediate c; 900 mg) was separated by SFC (Method: Column DAICEL CHIRALPAK AD (250 mm*50 mm, 10 μm), Condition 0.1% NH3.H2O MeOH, Begin B 25, End B 25 Gradient Time (min) 5.5 min:900 min, 100% B Hold Time (min) 0, FlowRate (mL/min) 50 g/min) to give (S or R)-4-((3,4-dimethoxyphenyl)(4-fluorophenyl)methyl)piperidine (278 mg, 29%; MS (ESI): m/z=330.3 [M+H]+) and (R or S)-4-((3,4-dimethoxyphenyl)(4-fluorophenyl)methyl)piperidine (426 mg, 44%; MS (ESI): m/z=330.1 [M+H]+) as off-white solids.
A solution of 4-[(4-fluorophenyl)-(4-methoxyphenyl)methyl]piperidine (BB107, intermediate; 930 mg, 3.11 mmol) in MeOH (5 mL) was purified and the enantiomers separated using SFC to afford (S or R)-4-[(4-fluorophenyl)-(4-methoxyphenyl)methyl]piperidine (277 mg, 27%) as light yellow semisolid; MS (ESI): m/z=300.1 [M+H]+; and (R or S)-4-[(4-fluorophenyl)-(4-methoxyphenyl)methyl]piperidine (291 mg, 30%) as light yellow semisolid; MS (ESI): m/z=300.1 [M+H]+.
A solution of 4-[[4-(2-fluoroethoxy)phenyl]-(4-fluorophenyl)methyl]piperidine (700 mg, 2.11 mmol) in MeOH (5 mL) was purified and the enantiomers separated using SFC to afford (R or S)-4-[[4-(2-fluoroethoxy)phenyl]-(4-fluorophenyl)methyl]piperidine (203 mg, 29%) as colorless oil; MS (ESI): m/z=332.2 [M+H]+; and (S or R)-4-[[4-(2-fluoroethoxy)phenyl]-(4-fluorophenyl)methyl]piperidine (160 mg, 23%) as colorless oil; MS (ESI): m/z=332.2 [M+H]+.
The title compound was prepared in analogy to intermediate 1-[(4-fluorophenyl)-phenyl-methyl]piperazine (CAS RN 27064-89-7), starting from 1-bromo-4-(2-fluoroethoxy)benzene (CAS RN 332-47-8) and tert-butyl 4-(4-fluorobenzoyl)piperidine-1-carboxylate (CAS RN 160296-40-2) to give the title compound as colorless oil. MS (ESI): m/z=332.1 [M+H]+.
A solution of 4-[[3-(2-fluoroethoxy)phenyl]-phenyl-methyl]piperidine (BB103, intermediate; 800 mg, 2.55 mmol) in MeOH (5 mL) was purified and the enantiomers separated using SFC to afford (S or R)-4-((3-(2-fluoroethoxy)phenyl)(phenyl)methyl)piperidine (214 mg, 27%) as white solid; MS (ESI): m/z=314.1 [M+H]+; and (R or S)-4-((3-(2-fluoroethoxy)phenyl)(phenyl)methyl)piperidine (305 mg, 38%) as white solid. MS (ESI): m/z=314.1 [M+H]+.
A solution of 4-[[4-(2-fluoroethoxy)phenyl]-(4-fluorophenyl)methyl]piperidine (BB121, intermediate; 700 mg, 2.11 mmol) in MeOH (5 mL) was purified and the enantiomers separated by SFC to afford (R or S)-4-[[4-(2-fluoroethoxy)phenyl]-(4-fluorophenyl)methyl]piperidine (203 mg, 29%) as colorless oil; MS (ESI): m/z=332.2 [M+H]+; and (S or R)-4-[[4-(2-fluoroethoxy)phenyl]-(4-fluorophenyl)methyl]piperidine (160 mg, 23%) as colorless oil. MS (ESI): m/z=332.2 [M+H]+.
A mixture of benzyl 4-((3-(2-((tert-butoxycarbonyl)amino)ethoxy)phenyl)(phenyl)methylene)piperidine-1-carboxylate (60 mg, 111 μmol), methanol (3 mL) and AcOH (60 μL) was charged with Pt—Pd/C (60 mg, 2.5%+2.5%, 63% H2O) and put under a hydrogen gas atmosphere (50 bar). The mixture was shaken at 50° C. for 2 h, diluted with EtOAc and filtered. The filtrate was washed with KHCO3 and the organic layer was dried over Na2SO4. The solvent was removed under reduced pressure to give crude title compound (33 mg, 68%) as white foam which was used in the next reaction step without further purification. MS (ESI): m/z=411.3 [M+H]+.
A solution of 4-methylbenzenesulfonhydrazide (1.54 g, 8.29 mmol, CAS RN 1576-35-8;) and tert-butyl 4-benzoylpiperidine-1-carboxylate (2 g, 6.91 mmol, CAS RN 922504-27-6) in 1,4-dioxane (150 mL) was stirred at 100° C. for 16 h. EtOAc and water were added. The layers were separated and the organic layer was dried over Na2SO4. The solvent was removed under reduced pressure and the residue purified by flash chromatography (25 g silica gel; gradient of EtOAc (0-30%) in n-heptane) to give the title compound (3.55 g, 82%) as light brown oil. MS (ESI): m/z=492.2 [M+H]+.
A mixture of benzyl (Z)-4-(phenyl(2-tosylhydrazineylidene)methyl)piperidine-1-carboxylate (1 g mg, 2.03 mmol), bis(triphenylphosphine)palladium(II) chloride (143 mg, 203 μmol), lithium tert-butoxide (246 mg, 3.05 mmol) and N-boc-2-(3-bromophenoxy)ethylamine (CAS RN 1098107-26-6; 772 mg, 2.44 μmol) in 1,4-dioxane (65 mL) was stirred at 80° C. for 12 h. EtOAc and water were added. The layers were separated and the organic layer was dried over Na2SO4. The solvent was removed under reduced pressure and the residue purified by flash chromatography (80 g silica gel; gradient of EtOAc in n-heptane 0-30%) to give the title compound (280 mg, 22%) as light yellow foam. MS (ESI): m/z=443.2 [M-Boc+H]+.
The compound was obtained in analogy to BB52 from tert-butyl 4-(5-chloroisoindolin-2-yl)piperidine-1-carboxylate to get the desired compound as a light green solid. MS (ESI): m/z=237.2 [M+H]+.
The compound was obtained in analogy to BB148, intermediate, from 5-chloroisoindoline hydrochloride (CAS RN 912999-79-2) to get the desired compound as a light brown solid. MS (ESI): m/z=337.3 [M+H]+.
A white suspension of tert-butyl (4aS,8aS)-3-oxohexahydro-2H-pyrido[4,3-b][1,4]oxazine-6(5H)-carboxylate (330 mg, 1.29 mmol) in 2M hydrogen chloride in ether (6.44 ml, 12.9 mmol) was stirred at RT for 22 hours. The colorless suspension was filtered and washed with diethylether to get the desired product as a colorless solid (0.172 g; 69.3%). MS (ESI): m/z=157.0990 [M+H]+.
To an ice-cold solution of tert-butyl (3S,4S)-3-(2-chloroacetamido)-4-hydroxypiperidine-1-carboxylate (436 mg, 1.49 mmol) in DCM (7 ml) was added dropwise a solution of potassium tert-butoxide (668 mg, 5.96 mmol) in 2-Propanol (18 ml). The ice-bath was removed and the mixture was stirred at RT for 24 hours while getting a white suspension. The mixture was evaporated. The residue was taken up in ethyl acetate and water and the layers were separated. The aqueous layer was extracted twice with ethyl acetate. The organic layers were dried over MgSO4, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 40 g column using an MPLC system eluting with a gradient of DCM:MeOH (100:0 to 90:10) to get the desired compound as a colorless foam (330 mg; 86.5% yield). MS (ESI): m/z=201.1 [M-C4H8+H]+.
To an ice-cold suspension of tert-butyl (3S,4S)-3-amino-4-hydroxypiperidine-1-carboxylate (500 mg, 2.31 mmol, CAS RN 1312812-78-4) and sodium acetate trihydrate (629 mg, 4.62 mmol) in acetone (4 ml) and water (300 μl) was added dropwise a solution of 2-chloroacetyl chloride (261 mg, 184 μl, 2.31 mmol) in acetone (500 μl). The mixture was stirred at RT for 3 hours before silica gel was added. The suspension was evaporated. The compound was purified by silica gel chromatography on a 12 g column using an MPLC (ISCO) system eluting with a gradient of n-heptane:ethyl acetate (100:0 to 0:100) to get the desired compound as a colorless foam (436 mg; 64.4%). MS (ESI): m/z=291.3 [M−H]−.
A solution of tert-butyl 4-[1-[4-(trifluoromethyl)phenyl]ethyl]piperidine-1-carboxylate (1500.0 mg, 4.2 mmol) in HCl in dioxane (50.0 mL, 200 mmol) was stirred at 20° C. for 2 h. The mixture was concentrated and the residue was purified by prep-HPLC (FA) and lyophilized to give the desired compound as a light yellow oil (838.4 mg, 77.1%). MS (ESI): m/z=258.1 [M+H]+.
To a solution of methyltriphenylphosphonium bromide (499.8 mg, 1.4 mmol, CAS RN 1779-49-3) in THF (10 mL) was added potassium tert-butoxide (235.5 mg, 2.1 mmol) portionwise at 0° C. and the mixture was stirred at 0° C. for 30 min. tert-Butyl 4-[4-(trifluoromethyl)benzoyl]piperidine-1-carboxylate (500.0 mg, 1.4 mmol, CAS RN 725229-27-6) in THF (5 mL) was added dropwise and the mixture was warmed to 20° C. and stirred at RT for 12 h. The mixture was poured into saturated aq. NH4Cl solution (50 mL) and extracted twice with EtOAc (20 mL each). The layers were separated, the organic phase washed with brine, dried over Na2SO4 and filtered. The filtrate was purified by silica gel column (PE:EtOAc=20:1) to give the desired compound as light yellow oil (200 mg, 40.2%). MS: MS (ESI): m/z=300.0 [M-C4H8+H]+.
To a solution of tert-butyl 4-[1-[4-(trifluoromethyl)phenyl]vinyl]piperidine-1-carboxylate (2.0 g, 5.63 mmol) in EtOAc (100 mL) was added Pd/C (1.0 g, 5.63 mmol) and the mixture was stirred at 20° C. under an hydrogen atmosphere for 12 h. The mixture was filtered and the filtrate was concentrated to give the crude product (1.8 g, 89.5%) as a colorless oil which was used in the next step without further purification. MS (ESI): m/z=302.2 [M-C4H8+H]+.
In a 25 mL tube tert-butyl 4-(5-(trifluoromethyl)pyridin-3-yl)piperidine-1-carboxylate (110 mg, 333 μmol) was dissolved in DCM (1 mL) and HCl in ether 2M (2 mL, 4 mmol) was added. The reaction was stirred 6 h at RT. The solvent was removed in vacuo to obtain the crude product as a white foam, 100 mg (99%). Used without further purification. MS (ESI): m/z=231.1 [M+H]+.
In a dried 25 mL three-necked flask, zinc powder (172 mg, 2.63 mmol) was combined with 1 mL DMA (over molecular sieve) to give a grey suspension. The mixture was stirred at RT while a 7:5 v/v mixture of chlorotrimethylsilane (32 ul) and 1,2-dibromoethane (22 ul) as solution in DMA (1 mL) was added at a rate to maintain the temperature below 65° C. (slightly exothermic). The resulting slurry was stirred for 20 minutes. A solution of tert-butyl 4-iodopiperidine-1-carboxylate (688 mg, 2.21 mmol) in 2 mL DMA was slowly added to the mixture. The resulting reaction mixture was then stirred for 30 minutes at RT. The reaction was allowed to stand for 15 min without stirring for decantation.
In a 25 mL three-necked flask, 3-bromo-5-(trifluoromethyl)pyridine (250 mg, 1.11 mmol) was combined with 1.5 mL DMA to give a colorless solution, copper (I) iodide (21.1 mg, 111 μmol) and [1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II), complex with dichloromethane (45.2 mg, 55.3 μmol) were added. The reaction mixture was degassed with argon, the freshly prepared Zinc-reagent solution was added, again degassed with argon, and the reaction mixture was stirred over night at 80° C. The reaction mixture was quenched with 10 mL sat. aqueous NH4Cl solution and extracted twice with EtOAc (40 mL each). The organic layers were washed with brine. The organic layers were combined, dried over MgSO4 and concentrated in vacuo. Purification by SiO2 flash chromatography using n-heptane/EtOAc 0 to 80% in 35 min, afforded the desired product as light yellow oil (112 mg, 31%). MS (ESI): m/z=331.2 [M+H]+.
tert-Butyl 4-(difluoro(4-(trifluoromethyl)phenyl)methyl)piperidine-1-carboxylate (0.338 g, 891 μmol) was dissolved in DCM (1 mL) and HCl in ether 2M (4.45 mL, 8.91 mmol) was added. The reaction was stirred 16 h at RT. The solvent was removed in vacuo to obtain the crude product as a off-white solid, 246 mg (82%). Used without further purification. MS (ESI): m/z=280.11 [M+H]+.
To a solution of piperidin-4-yl(4-(trifluoromethyl)phenyl)methanone hydrochloride (0.500 g, 1.7 mmol), triethylamine (345 mg, 475 μl, 3.4 mmol) and DMAP (62.4 mg, 511 μmol) in Acetonitrile (10 mL), was added at 0° C. under argon Boc2O (446 mg, 2.04 mmol). The reaction mixture was stirred at RT for 4 hours. The reaction mixture was poured into 15 mL sat NaHCO3 and extracted twice with EtOAc (25 mL each). The organic layers were combined, washed with brine, dried over Na2SO4 and concentrated in vacuo. The crude material was triturated with n-heptane to yield the desired product as an off white solid (354 mg, 58%), used directly for next step. MS (ESI): m/z=302.1 [M-C4H8+H]+.
To a solution of tert-butyl 4-(4-(trifluoromethyl)benzoyl)piperidine-1-carboxylate (0.350 g, 979 μmol) in DCM (3 mL), DAST (5.53 g, 34.3 mmol) was added. The reaction mixture was stirred at 45° C. for three days. The reaction mixture was poured into 15 mL H2O and ice and extracted twice with DCM (20 mL each). The organic layers were combined, washed with brine, dried over Na2SO4 and concentrated in vacuo. The crude material was purified by flash chromatography (silica gel, 20 g, 0% to 20% EtOAc in n-heptane) to provide the desired compound as a yellow oil (341 mg, 92%). MS (ESI): m/z=379.1 [M+H]+.
In a 25 mL tube tert-butyl 4-(5-methoxypyridin-3-yl)piperidine-1-carboxylate (150 mg, 513 μmol) was dissolved in DCM (1 mL) and HCl in ether 2M (2.57 mL, 5.13 mmol) was added. The reaction was stirred 3 h at RT. The solvent was removed in vacuo to obtain the crude product as a light yellow foam, 136 mg (100%). Used without further purification. MS (ESI): m/z=193.1 [M+H]+.
In a dried 25 mL three-necked flask, zinc powder (232 mg, 3.54 mmol) was combined with 1 mL DMA (over molecular sieve) to give a grey suspension. The mixture was stirred at RT while a 7:5 v/v mixture of chlorotrimethylsilane (32 uL) and 1,2-dibromoethane (22 ul) as solution in DMA (1 mL) was added at a rate to maintain the temperature below 65° C. (slightly exothermic). The resulting slurry was stirred for 20 minutes. A solution of tert-butyl 4-iodopiperidine-1-carboxylate (927 mg, 2.98 mmol) in 2 mL DMA was slowly added to the mixture. The resulting reaction mixture was then stirred for 30 minutes at RT. The reaction was allowed to stand for 15 min without stirring for decantation.
In a 25 mL three-necked flask, 3-bromo-5-methoxypyridine (280 mg, 1.49 mmol) was combined with 1.5 mL DMA to give a colorless solution, copper (I) iodide (28.4 mg, 149 μmol) and [1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II), complex with dichloromethane (60.8 mg, 74.5 μmol) were added. The reaction mixture was degassed with argon, the freshly prepared Zinc-reagent solution was added, again degassed with argon, and the reaction mixture was stirred for 6 hr at 80° C. The reaction mixture was quenched with 10 mL sat. NH4Cl and extracted two times with EtOAc (40 mL each). The organic layers were washed with brine. The organic layers were combined, dried over MgSO4 and concentrated in vacuo. Purification by SiO2 flash chromatography using n-heptane/EtOAc 0 to 100% in 35 min, afforded the desired product as light yellow oil (150 mg, 34.5%). MS (ESI): m/z=293.2 [M+H]+.
tert-butyl 4-(difluoro(4-(trifluoromethyl)phenyl)methyl)piperidine-1-carboxylate (440 mg, 1.27 mmol) was dissolved in DCM (2 mL) and HCl in ether 2M (6.36 mL, 12.7 mmol) was added. The reaction was stirred for 64 hr at RT. The solvent was removed in vacuo to obtain the crude product as a off-white solid, 323 mg (90%). Used without further purification. MS (ESI): m/z=246.1 [M+H]+.
To a solution of tert-butyl 4-(4-chlorobenzoyl)piperidine-1-carboxylate (0.500 g, 1.54 mmol) in DCM (3 mL), DAST (8.71 g, 54 mmol) was added. The reaction mixture was stirred at 45° C. for eight days. The reaction mixture was poured into 15 mL H2O and ice and extracted twice with DCM (20 mL each). The organic layers were combined, washed with brine, dried over Na2SO4 and concentrated in vacuo. The crude material was purified by flash chromatography (silica gel, 20 g, 0% to 20% EtOAc in n-heptane) to provide the desired product as yellow oil (440 mg, 82%). MS (ESI): m/z=345.1 [M+H]+.
In a 25 mL tube tert-butyl 4-(5-(trifluoromethoxy)pyridin-2-yl)piperidine-1-carboxylate (380 mg, 1.1 mmol) was dissolved in DCM (2 mL) and HCl in ether 2M (3.29 mL, 6.58 mmol) was added. The reaction was stirred at RT for 4 h. The solvent was removed in vacuo to obtain the crude product as a light yellow foam (349 mg, 99%) which was used in the next step without further purification. MS (ESI): m/z=246.2 [M+H]+.
In a dried 25 mL three-necked flask, zinc powder (193 mg, 2.38 mmol) was combined with 1.5 mL DMA (over molecular sieve) to give a grey suspension. The mixture was stirred at RT while a 7:5 v/v mixture of chlorotrimethylsilane (32 ul) and 1,2-dibromoethane (22 ul) as solution in DMA (1 mL) was added at a rate to maintain the temperature below 65° C. (slightly exothermic). The resulting slurry was stirred for 20 minutes. A solution of tert-butyl 4-iodopiperidine-1-carboxylate (771 mg, 2.48 mmol) in 2 mL DMA was slowly added to the mixture. The resulting reaction mixture was then stirred for 30 minutes at RT. The reaction was allowed to stand for 15 min without stirring for decantation.
In a 25 mL three-necked flask, 2-bromo-5-(trifluoromethoxy)pyridine (300 mg, 172 μl, 1.24 mmol) was combined with 1.5 mL DMA to give a colorless solution, copper (I) iodide (23.6 mg, 124 μmol) and [1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II), complex with dichloromethane (50.6 mg, 62 μmol) were added. The reaction mixture was degassed with argon, the freshly prepared Zinc-reagent solution was added, again degassed with argon, and the reaction mixture was stirred for 6 hr at 80° C. The reaction mixture was quenched with 10 mL sat. NH4Cl and extracted twice with EtOAc (40 mL each). The organic layers were washed with brine. The organic layers were combined, dried over MgSO4 and concentrated in vacuo. Purification by SiO2 flash chromatography using n-heptane/EtOAc 0 to 50% in 35 min, afforded the desired product as light yellow oil (387 mg, 90.1%). MS (ESI): m/z=347.1 [M+H]+.
In a 25 mL tube tert-butyl 4-((2-chloro-4-fluorophenyl)difluoromethyl)piperidine-1-carboxylate (0.363 g, 998 μmol) was dissolved in DCM (2 mL) and HCl in ether 2M (4.99 mL, 9.98 mmol) was added. The reaction was stirred at RT over night. The solvent was removed in vacuo to obtain the crude product as a light brown solid, 296 mg (99%). Used without further purification. MS (ESI): m/z=264.08 [M+H]+.
To a solution of tert-butyl 4-(2-chloro-4-fluorobenzoyl)piperidine-1-carboxylate (0.48 g, 1.4 mmol) in DCM (4 mL), DAST (7.92 g, 49.2 mmol) was added. The reaction mixture was stirred at 45° C. for ten days. The reaction mixture was poured into 15 mL H2O+ice and extracted with DCM (2×20 mL). The organic layers were combined, washed with brine, dried over Na2SO4 and concentrated in vacuo. The crude material was purified by flash chromatography (silica gel, 20 g, 0% to 20% EtOAc in n-heptane): 363 mg (71%), light brown oil, desired product. MS (ESI): m/z=363.1 [M+H]+.
In a 25 mL tube tert-butyl 4-(5-ethylpyridin-3-yl)piperidine-1-carboxylate (295 mg, 1.02 mmol) was dissolved in DCM (3 mL) and HCl in ether 2M (3.05 mL, 6.09 mmol) was added. The reaction was stirred 4 h at RT. The solvent was removed in vacuo to obtain the crude product as a yellow solid, 266 mg (99%). Used without further purification. MS (ESI): m/z=191.1 [M+H]+.
In a dried 25 mL three-necked flask, zinc powder (234 mg, 3.58 mmol) was combined with 1.5 mL DMA (over molecular sieve) to give a grey suspension. The mixture was stirred at RT while a 7:5 v/v mixture of chlorotrimethylsilane (32 ul) and 1,2-dibromoethane (22 ul) as solution in DMA (1 mL) was added at a rate to maintain the temperature below 65° C. (slightly exothermic). The resulting slurry was stirred for 20 minutes. A solution of tert-butyl 4-iodopiperidine-1-carboxylate (937 mg, 3.01 mmol) in 2 mL DMA was slowly added to the mixture. The resulting reaction mixture was then stirred for 30 minutes at RT. The reaction was allowed to stand for 15 min without stirring for decantation.
In a 25 mL three-necked flask, 3-bromo-5-ethylpyridine (280 mg, 1.5 mmol) was combined with 1.5 mL DMA to give a colorless solution, copper (I) iodide (28.7 mg, 150 μmol) and [1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II), complex with dichloromethane (61.5 mg, 75.2 μmol) were added. The reaction mixture was degassed with argon, the freshly prepared Zinc-reagent solution was added, again degassed with argon, and the reaction mixture was stirred for 2.5 hr at 80° C. The reaction mixture was quenched with 10 mL sat. aqueous NH4Cl solution and extracted with EtOAc (40 mL each). The organic layers were washed with brine. The organic layers were combined, dried over MgSO4 and concentrated in vacuo. Purification by SiO2 flash chromatography using n-heptane/EtOAc 0 to 60% in 40 min, afforded the desired product as light yellow oil (299 mg, 68.4%). MS (ESI): m/z=291.2 [M+H]+.
In a 25 mL tube tert-butyl 4-(5-(1,1-difluoroethyl)pyridin-2-yl)piperidine-1-carboxylate (416 mg, 1.27 mmol) was dissolved in DCM (3 mL) and HCl in ether 2M (3.82 mL, 7.65 mmol) was added. The reaction was stirred 4 h at RT. The solvent was removed in vacuo to obtain the crude product as a yellow solid, 381 mg (99%). Used without further purification. MS (ESI): m/z=227.2 [M+H]+.
In a dried 25 mL three-necked flask, zinc powder (210 mg, 3.22 mmol) was combined with 1.5 mL DMA (over molecular sieve) to give a grey suspension. The mixture was stirred at RT while a 7:5 v/v mixture of chlorotrimethylsilane (32 ul) and 1,2-dibromoethane (22 ul) as solution in DMA (1 mL) was added at a rate to maintain the temperature below 65° C. (slightly exothermic). The resulting slurry was stirred for 20 minutes. A solution of tert-butyl 4-iodopiperidine-1-carboxylate (841 mg, 2.7 mmol) in 2 mL DMA was slowly added to the mixture. The resulting reaction mixture was then stirred for 30 minutes at RT. The reaction was allowed to stand for 15 min without stirring for decantation.
In a 25 mL three-necked flask, 2-bromo-5-(1,1-difluoroethyl)pyridine (300 mg, 1.35 mmol) was combined with 1.5 mL DMA to give a colorless solution, copper (I) iodide (25.7 mg, 135 μmol) and [1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II), complex with dichloromethane (55.2 mg, 67.6 μmol) were added. The reaction mixture was degassed with argon, the freshly prepared Zinc-reagent solution was added, again degassed with argon, and the reaction mixture was stirred for 2.5 hr at 80° C. The reaction mixture was quenched with 10 mL sat. NH4Cl and extracted twice with EtOAc (40 mL each), The organic layers were washed with brine. The organic layers were combined, dried over MgSO4 and concentrated in vacuo. Purification by SiO2 flash chromatography using n-heptane/EtOAc 0 to 50% in 40 min, afforded the desired product as yellow oil (419 mg, 85%). MS (ESI): m/z=327.2 [M+H]+.
The title compound was prepared in analogy to Method A2 from BB14a and 5-(1,1-difluoroethyl)-2-(3-methyl-4-piperidyl)pyridine dihydrochloride. MS (ESI): m/z=423.4 [M+H]+.
In a 25 mL tube tert-butyl 4-(5-(1,1-difluoroethyl)pyridin-2-yl)-3-methylpiperidine-1-carboxylate (265 mg, 778 μmol) was dissolved in DCM (3 mL) and HCl in ether 2M (3.11 mL, 6.23 mmol) was added. The reaction was stirred 4 h at RT. The solvent was removed in vacuo to obtain the crude product as a light yellow solid (242 mg, 99%). Used without further purification. MS (ESI): m/z=241.2 [M+H]+.
In a dried 25 mL three-necked flask, zinc powder (140 mg, 2.14 mmol) was combined with 1.5 mL DMA (over molecular sieve) to give a grey suspension. The mixture was stirred at RT while a 7:5 v/v mixture of chlorotrimethylsilane (32 ul) and 1,2-dibromoethane (22 ul) as solution in DMA (1 mL) was added at a rate to maintain the temperature below 65° C. (slightly exothermic). The resulting slurry was stirred for 20 minutes. A solution of tert-butyl 4-iodo-3-methylpiperidine-1-carboxylate (586 mg, 1.8 mmol) in 2 mL DMA was slowly added to the mixture. The resulting reaction mixture was then stirred for 30 minutes at RT. The reaction was allowed to stand for 15 min without stirring for decantation. In a 25 mL three-necked flask, 2-bromo-5-(1,1-difluoroethyl)pyridine (200 mg, 901 μmol, CAS RN 1211521-60-6) was combined with 1.5 mL DMA to give a colorless solution, copper (I) iodide (17.2 mg, 90.1 μmol) and [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II), complex with dichloromethane (36.8 mg, 45 μmol) were added. The reaction mixture was degassed with argon, the freshly prepared Zinc-reagent solution was added, again degassed with argon, and the reaction mixture was stirred for 3 hr at 80° C. The reaction mixture was quenched with 10 mL sat. NH4Cl and extracted twice with EtOAc (40 mL each). The organic layers were washed with brine. The organic layers were combined, dried over MgSO4 and concentrated in vacuo. Purification by SiO2 flash chromatography using n-heptane/EtOAc (0 to 50% over 35 min), afforded the desired product as yellow oil (266 mg, 87%). MS (ESI): m/z=341.2 [M+H]+.
In a 25 mL tube tert-butyl 4-(2,2,2-trifluoro-1-phenylethyl)piperazine-1-carboxylate (155 mg, 450 μmol) was dissolved in DCM (2 mL) and HCl in ether 2M (1.8 mL, 3.6 mmol) was added. The reaction was stirred 4 h at RT. The solvent was removed in vacuo to obtain the crude product as a light brown solid, 127 mg (100%). Used without further purification. MS (ESI): m/z=245.3 [M+H]+.
To a dry 100 mL flask with septum and N2 bubbler was added tert-butyl piperazine-1-carboxylate (1000 mg, 5.37 mmol), triethylamine (1.63 g, 2.25 mL, 16.1 mmol), 2,2,2-trifluoro-1-phenylethan-1-one (935 mg, 754 μl, 5.37 mmol) and DCM (33 mL). Titanium tetrachloride 1M in DCM (2.68 mL, 2.68 mmol) was added via syringe. The reaction was stirred for 18 h, carefully quenched with a methanolic solution of NaCNBH3 (sodium cyanoborohydride (1.01 g, 16.1 mmol) in methanol (12.8 mL, 316 mmol) and stirred for 15 min. The reaction was basified to pH 13 with 5 M NaOH (0.5 mL), extracted with DCM (2×60 mL), dried (Na2SO4) and evaporated to yield a yellow oil (2 g).
Purification by SiO2 flash chromatography using a gradient of EtOAc in n-heptane (0 to 30% over 40 min), afforded the desired product as a light yellow oil (156 mg, 8.4%). MS (ESI): m/z=345.2 [M+H]+.
In a 25 mL tube tert-butyl 4-(2,2,2-trifluoro-1-phenylethyl)piperazine-1-carboxylate (330 mg, 868 μmol) was dissolved in DCM (2 mL) and HCl in ether 2M (2.6 mL, 5.1 mmol) was added. The reaction was stirred 4 h at RT. The solvent was removed in vacuo to obtain the crude product as a brown viscous oil, 266 mg (97%). Used without further purification. MS (ESI): m/z=282.3 [M+H]+.
To a dry 100 mL flask with septum and N2 bubbler was added tert-butyl piperazine-1-carboxylate (1000 mg, 5.37 mmol), triethylamine (1.63 g, 2.25 mL, 16.1 mmol), 1-(2,4-difluorophenyl)-2,2,2-trifluoroethan-1-one (1.13 g, 5.37 mmol) and DCM (33 mL). Titanium tetrachloride 1M in DCM (2.68 mL, 2.68 mmol) was added via syringe. The reaction was stirred for 18 h, carefully quenched with a methanolic solution of NaCNBH3 (sodium cyanoborohydride (1.01 g, 16.1 mmol) in methanol (4.3 mL, 107 mmol) and stirred for 6 hr. The reaction was basified with NaHCO3 sat. (10 mL). The insoluble material obtained was filtered off using celite, the filtrate was extracted with DCM (2×60 mL), dried (Na2SO4) and evaporated to yield a yellow oil (2.1 g).
Purification by SiO2 flash chromatography n-heptane/EtOAc 0 to 20% in 40 min, afforded the desired product as a yellow oil (340 mg, 13.3%). MS (ESI): m/z=381.1 [M+H]+.
In a 25 mL tube tert-butyl 4-(2-cyclopropylpyridin-4-yl)piperidine-1-carboxylate (278 mg, 919 μmol) was dissolved in DCM (2 mL) and HCl in ether 2M (2.76 mL, 5.52 mmol) was added. The reaction was stirred 4 h at RT. The solvent was removed in vacuo to obtain the crude product as a light yellow solid, 250 mg (99%). Used without further purification. MS (ESI): m/z=202.4 [M+H]+.
In a dried 25 mL three-necked flask, zinc powder (196 mg, 3 mmol) was combined with 1.5 mL DMA (over molecular sieve) to give a grey suspension. The mixture was stirred at RT while a 7:5 v/v mixture of chlorotrimethylsilane (32 ul) and 1,2-dibromoethane (22 ul) as solution in DMA (1 mL) was added at a rate to maintain the temperature below 65° C. (slightly exothermic). The resulting slurry was stirred for 20 minutes. A solution tert-butyl 4-iodopiperidine-1-carboxylate (786 mg, 2.52 mmol) in 2 mL DMA was slowly added to the mixture. The resulting reaction mixture was then stirred for 30 minutes at RT. The reaction was allowed to stand for 15 min without stirring for decantation.
In a 25 mL three-necked flask, 4-bromo-2-cyclopropylpyridine (250 mg, 1.26 mmol) was combined with 1.5 mL DMA to give a colorless solution, copper (I) iodide (24 mg, 126 μmol) and [1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II), complex with dichloromethane (51.1 mg, 63.1 μmol) were added. The reaction mixture was degassed with argon, the freshly prepared Zinc-reagent solution was added, again degassed with argon, and the reaction mixture was stirred for 3 hr at 80° C. The reaction mixture was quenched with 10 mL sat. aqueous NH4Cl solution and extracted with EtOAc (40 mL each). The organic layers were washed with brine. The organic layers were combined, dried over MgSO4 and concentrated in vacuo. Purification by SiO2 flash chromatography using n-heptane/0 to 60% in 45 min, afforded the desired product as light yellow oil (278 mg, 73%). MS (ESI): m/z=303.2 [M+H]+.
In a 25 mL tube tert-butyl 4-(5-methyl-6-(trifluoromethyl)pyridin-3-yl)piperidine-1-carboxylate (360 mg, 1.05 mmol) was dissolved in DCM (3 mL) and HCl in ether 2M (2.61 mL, 5.23 mmol) was added. The reaction was stirred 4 h at RT. The solvent was removed in vacuo to obtain the crude product as a white solid, 314 mg (95%). Used without further purification. MS (ESI): m/z=245.2 [M+H]+.
In a dried 25 mL three-necked flask, zinc powder (182 mg, 2.78 mmol) was combined with 1.5 mL DMA (over molecular sieve) to give a grey suspension. The mixture was stirred at RT while a 7:5 v/v mixture of chlorotrimethylsilane (32 ul) and 1,2-dibromoethane (22 ul) as solution in DMA (1 mL) was added at a rate to maintain the temperature below 65° C. (slightly exothermic). The resulting slurry was stirred for 20 minutes. A solution tert-butyl 4-iodopiperidine-1-carboxylate (726 mg, 2.33 mmol) in 2 mL DMA was slowly added to the mixture. The resulting reaction mixture was then stirred for 30 minutes at RT. The reaction was allowed to stand for 15 min without stirring for decantation.
In a 25 mL three-necked flask, 5-bromo-3-methyl-2-(trifluoromethyl)pyridine (280 mg, 1.17 mmol) was combined with 1.5 mL DMA to give a colorless solution, copper (I) iodide (22.2 mg, 117 μmol) and [1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II), complex with dichloromethane (48 mg, 58 μmol) were added. The reaction mixture was degassed with argon, the freshly prepared Zinc-reagent solution was added, again degassed with argon, and the reaction mixture was stirred for 2.5 hr at 70° C. The reaction mixture was quenched with 10 mL sat. NH4Cl and extracted twice with EtOAc (40 mL each). The organic layers were washed with brine. The organic layers were combined, dried over MgSO4 and concentrated in vacuo. Purification by SiO2 flash chromatography using n-heptane/EtOAc 0 to 50% in 40 min, afforded the desired product as a white, crystalline solid (360 mg, 90%). MS (ESI): m/z=345.2 [M+H]+.
In a 25 mL tube tert-butyl 4-(5,6,7,8-tetrahydroquinolin-4-yl)piperidine-1-carboxylate (255 mg, 806 μmol) was dissolved in DCM (3 mL) and HCl in ether 2M (2.01 mL, 4.03 mmol) was added. The reaction was stirred 8 h at RT. The solvent was removed in vacuo to obtain the crude product as a light yellow solid, 230 mg (99%). Used without further purification. MS (ESI): m/z=217.4 [M+H]+.
In a dried 25 mL three-necked flask, zinc powder (177 mg, 2.71 mmol) was combined with 1.5 mL DMA (over molecular sieve) to give a grey suspension. The mixture was stirred at RT while a 7:5 v/v mixture of chlorotrimethylsilane (32 ul) and 1,2-dibromoethane (22 ul) as solution in DMA (1 mL) was added at a rate to maintain the temperature below 65° C. (slightly exothermic). The resulting slurry was stirred for 20 minutes. A solution tert-butyl 4-iodopiperidine-1-carboxylate (734 mg, 2.36 mmol) in 2 mL DMA was slowly added to the mixture. The resulting reaction mixture was then stirred for 30 minutes at RT. The reaction was allowed to stand for 15 min without stirring for decantation.
In a 25 mL three-necked flask, 4-bromo-5,6,7,8-tetrahydroquinoline (250 mg, 1.18 mmol) was combined with 1.5 mL DMA to give a colorless solution, copper (I) iodide (22.4 mg, 118 μmol) and [1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II), complex with dichloromethane (48 mg, 58 μmol) were added. The reaction mixture was degassed with argon, the freshly prepared Zinc-reagent solution was added, again degassed with argon, and the reaction mixture was stirred for 2.5 hr at 75° C. The reaction mixture was quenched with 10 mL sat. NH4Cl and extracted twice with EtOAc (40 mL each). The organic layers were washed with brine. The organic layers were combined, dried over MgSO4 and concentrated in vacuo. Purification by SiO2 flash chromatography using a gradient of EtOAc in n-heptane/(0 to 70% over 40 min), afforded the desired product as a colorless, viscous oil (255 mg, 68.4%). MS (ESI): m/z=317.3 [M+H]+.
To a solution of tert-butyl 3-(2-fluoro-4-(trifluoromethyl)phenyl)azetidine-1-carboxylate (0.078 g, 244 μmol) in DCM (2 mL) was added TFA (94.1 μl, 1.22 mmol). The resulting reaction mixture was stirred at RT for 1 hour. The reaction mixture was concentrated in vacuo (co-evaporated with toluol) to yield the desired product as as colorless oil (85 mg, 100%). MS (ESI): m/z=220.1 [M+H]+.
To an 20 mL vial equipped with a stir bar was added photocatalyst (Ir[dF(CF3)ppy]2(dtbpy))PF6 (6.93 mg, 6.17 μmol), 1-bromo-2-fluoro-4-(trifluoromethyl)benzene (150 mg, 88.5 μl, 617 μmol), tert-butyl 3-bromoazetidine-1-carboxylate (219 mg, 152 μl, 926 μmol), Tris(trimethylsilyl)silane (153 mg, 617 μmol) and anhydrous sodium carbonate (131 mg, 1.23 mmol). The vial was sealed and placed under argon before DME (5 mL) was added. To a separate vial was added NiCl2 glyme (1.36 mg, 6.17 μmol) and 4,4′-di-tert-butyl-2,2′-dipyridyl (1.66 mg, 6.17 μmol). The precatalyst vial was sealed, purged with argon then DME (2 mL) was added to it. The precatalyst vial was sonicated for 5 min, after which, 1 mL (0.5 mol % catalyst, 0.005 eq) was syringed into the reaction vessel. The solution was degassed by sparging with argon. The reaction was stirred and irradiated with a 420 nm lamp for 5 hours. The reaction was quenched by exposure to air and concentrated in vacuo. The crude material was purified by flash chromatography (silica gel, 50 g, gradient of 0% to 50% EtOAc in n-heptane) and a second flash chromatography (silica gel, 50 g, 0 to 20% EtOAc in n-heptane). The product was obtained as a colorless liquid (197 mg, 44%). MS (ESI): m/z=264.2 [M-C4H8+H]+.
In a 25 mL tube tert-butyl 4-(1-(4-fluorophenyl)-1H-pyrazol-3-yl)piperidine-1-carboxylate (100 mg, 290 μmol) was dissolved in DCM (3 mL) and HCl in ether 2M (1.16 mL, 2.23 mmol) was added. The reaction was stirred at RT for 6 h. The solvent was removed in vacuo to obtain the crude product as a light yellow solid (81 mg, 99%). The compound was used without further purification. MS (ESI): m/z=246.2 [M+H]+.
tert-butyl 4-acetylpiperidine-1-carboxylate (620 mg, 2.73 mmol) was combined with N,N-dimethylformamide dimethyl acetal (6.7 g, 54.6 mmol) and heated at 100° C. for 15 hr. LCMS showed complete reaction. The reaction mixture was directly concentrated in vacuo and the residue was combined with EtOH (8 mL) and hydrazine dihydrochloride (344 mg, 3.27 mmol). The mixture was stirred at reflux for 1.5 hr. LCMS showed again complete reaction. The reaction mixture was concentrated to yield the crude product as a light yellow solid (650 mg, 95%). Used for next step without further purification.
In a 100 mL flask purged with argon, tert-butyl 4-(1H-pyrazol-3-yl)piperidine-1-carboxylate (300 mg, 1.19 mmol) was suspended in DMF (8 mL), pyridine (386 μl, 4.77 mmol), (4-fluorophenyl)boronic acid (217 mg, 1.55 mmol) and copper (II) acetate (325 mg, 1.79 mmol) were added. The resulting green solution was stirred 60 hr at RT. The solvent was removed in vacuo, the residue was extracted with ethyl acetat/water/sat. NaCl, dried over MgSO4, filtered and the solvent was in vacuo. The crude material was purified by flash chromatography (silica gel, gradient of 0% to 40% EtOAc in n-heptane over 40 minutes). The product was obtained as a colorless, viscous oil (290 mg, 70%). MS (ESI): m/z=290.2 [M-C4H8+H]+.
In a 25 mL tert-butyl 4-(3-(trifluoromethyl)pyridazin-4-yl)piperidine-1-carboxylate (180 mg, 543 μmol) was dissolved in DCM (1 mL) and HCl in ether 2M (2.72 mL, 5.43 mmol) was added. The reaction was stirred 6 h at RT. The solvent was removed in vacuo to obtain the crude product as a yellow solid, 145 mg (100%). Used without further purification. MS (ESI): m/z=232.2 [M+H]+.
Potassium (1-(tert-butoxycarbonyl)piperidin-4-yl)trifluoroborate (649 mg, 2.23 mmol), silver nitrate (68.8 mg, 405 μmol) and potassium persulfate (2.74 g, 10.1 mmol) were added to a reaction tube equipped with a stir bar. 1,2-Dichloroethane (2 mL), water (2 mL), 3-(trifluoromethyl)pyridazine (300 mg, 2.03 mmol) and TFA (462 mg, 312 μl, 4.05 mmol) were successively added, and the tube was sealed. The reaction was vigorously stirred at RT for 24 h.
Then the reaction mixture was poured into 20 mL of a 1/1 v/v mixture of sat. aq. NaHCO3 and 5% aq. NaS2O3 and the resulting solution was extracted three times with DCM. The combined organic layers were dried (MgSO4) and evaporated to afford the crude product. Purification by SiO2 flash chromatography n-heptane/EtOAc 0 to 80% in 35 min, afforded the desired product as a yellow, viscous oil (180 mg, 80% pure, 21.5%). Regioisomer confirmed by NMR. MS (ESI): m/z=332.2 [M+H]+.
The compound was obtained in analogy to method A4 from 3-(4-hydroxyphenyl)azetidine 4-methylbenzenesulfonate. Light brown solid. MS (ESI): m/z=332.2 [M+H]+.
A mixture of tert-butyl 3-(4-(tert-butoxy)phenyl)azetidine-1-carboxylate (70 mg, 229 μmol) and 4-methylbenzenesulfonic acid hydrate (52.3 mg, 275 μmol) in EtOAc (1 mL) was stirred at reflux for 30 min. The mixture was evaporated to provide the desired product which was used in the next step without further purification.
The compound was obtained in analogy to method A7 from 1-bromo-4-(tert-butoxy)benzene (CAS RN 60876-70-2) to furnish the desired compound as a colorless solid. MS (ESI): m/z=250.2 [M-C4H8+H]+.
The compound was obtained in analogy to BB28 from tert-butyl 3-(3,4-dimethylphenyl)azetidine-1-carboxylate to provide the desired compound as a colorless solid.
MS (ESI): m/z=162.1 [M+H]+.
The compound was obtained in analogy to BB35, intermediate, from (3,4-dimethylphenyl)boronic acid to yield the desired compound as a colorless oil. MS (ESI): m/z=206.1 [M-C4H8+H]+.
The compound was obtained in analogy to BB28 from tert-butyl 3-(4-tert-butoxyphenyl)azetidine-1-carboxylate (BB145, intermediate b) at RT as a colorless solid. MS (ESI): m/z=206.2 [M+H]+.
The compound was obtained in analogy to BB26, intermediate a, from tert-butyl 4-(5-chloroindolin-1-yl)piperidine-1-carboxylate to provide the desired compound as a grey solid. MS (ESI): m/z=237.1 [M+H]+.
To a solution of 1-Boc-4-piperidone (972.84 mg, 4.88 mmol, CAS RN 79099-07-3) in MeOH (13 mL) was added AcOH (605.43 mg, 9.76 mmol), 5-chloroindoline (500.0 mg, 3.25 mmol, CAS RN 25658-80-4) and NaBH3(CN) (613.63 mg, 9.76 mmol) at 25° C. and the reaction mixture was stirred for 2 h. The reaction was poured into sat. aqueous NH4C solution (20 mL) and extracted three times with EtOAc (20 mL each). The combined organic layers were washed three times with water (20 mL each) and brine (20 mL), dried over Na2SO4 and concentrated in vacuum to provide the product as a white solid (1 g, 118.3%). MS (ESI): m/z=337.1 [M+H]+. The crude product was directly used in next step without further purification.
The compound was obtained in analogy to BB52 from tert-butyl 4-(4-chloroisoindolin-2-yl)piperidine-1-carboxylate to yield the desired compound. MS (ESI): m/z=237.2 [M+H]+. Used in the next step without further purification.
The compound was obtained in analogy to BB148, intermediate, from 4-chloroisoindoline (CAS RN 123594-04-7) to provide the desired compound as a grey oil. MS (ESI): m/z=337.3 [M+H]+.
The compound was obtained in analogy to BB26, intermediate, a from tert-butyl 4-(5′-chlorospiro[cyclopropane-1,3′-indoline]-1′-yl)piperidine-1-carboxylate to furnish the desired compound as a yellow solid. MS (ESI): m/z=263.1 [M+H]+.
The compound was obtained in analogy to BB148, intermediate, from 5′-chlorospiro[cyclopropane-1,3′-indoline] (CAS RN 1538359-43-1) to yield the desired compound as a pink solid. MS (ESI): m/z=307.1 [M-C4H8+H]+.
The compound was obtained in analogy to BB52 from tert-butyl 3-(4-chloroisoindolin-2-yl)azetidine-1-carboxylate to provide the desired compound as a light green solid. MS (ESI): m/z=209.2 [M+H]+.
The compound was obtained in analogy to BB148, intermediate from 4-chloroisoindoline hydrochloride (CAS RN 924304-73-4) to yield the desired compound as a colorless amorphous solid. MS (ESI): m/z=309.2 [M+H]+.
The compound was obtained in analogy to BB26, intermediate a from tert-butyl 3-[2-methoxy-4-(2,2,2-trifluoroethyl)phenyl]azetidine-1-carboxylate to furnish the desired compound as a yellow oil. MS (ESI): m/z=246.1 [M+H]+.
To a solution of tert-butyl 3-[2-methoxy-4-[2,2,2-trifluoro-1-(p-tolylsulfonyloxy)ethyl]phenyl]azetidine-1-carboxylate (480.0 mg, 0.930 mmol) in EtOH (24 mL) was added Pd/C (120.0 mg, 0.930 mmol) and the mixture was stirred at 20° C. under H2 atmosphere (balloon) for 24 h. The mixture was filtered and the filtrate was concentrated. The residue was dissolved in EtOAc (30 mL) and washed with aqueous Na2CO3 solution (20 mL) followed by brine, dried over Na2SO4 and concentrated to give the desired product as light yellow foam. (300 mg, 93.3%). MS (ESI): m/z=290.1 [M-C4H8+H]+.
The compound was obtained in analogy to method A7 from [1-(4-bromo-3-methoxy-phenyl)-2,2,2-trifluoro-ethyl] 4-methylbenzenesulfonate to get the desired compound as a light yellow oil. MS (ESI): m/z=460.1 [M-C4H8+H]+.
To a solution of 1-(4-bromo-3-methoxy-phenyl)-2,2,2-trifluoro-ethanol (1000.0 mg, 3.51 mmol), p-toluenesulfonyl chloride (668.81 mg, 3.51 mmol) and DMAP (20.0 mg, 0.180 mmol) in DCM (20 mL) was added TEA (708.62 mg, 7.02 mmol) at 0° C. The mixture was stirred at 20° C. for 12 h. The mixture was washed with water and brine, dried over Na2SO4, and concentrated to give the desired product as light yellow oil (1.5 g, 97.4%). The compound was used in the next step without further purification.
To a solution of 4-bromo-3-methoxy-benzaldehyde (2.0 g, 9.3 mmol, CAS RN 43192-34-3) and trifluoromethyltrimethylsilane (1586.94 mg, 11.16 mmol) in THF (30 mL) was added TBAF/THF (0.09 mL, 0.090 mmol) at 0° C., the mixture was stirred at 20° C. for 12 h, then 1M aq. HCl (18.6 mL, 18.6 mmol) was added slowly. The mixture was stirred at 20° C. for another 2 h. The mixture was poured into water (50 mL) and extracted three times with EtOAc (30 mL each). The combined organic phase was washed with brine, dried over Na2SO4 and concentrated to give the desired product as light yellow oil (2.5 g, 94.3%). 1H NMR (400 MHz, CHLOROFORM-d) δ=7.57 (d, J=8.1 Hz, 1H), 7.05 (s, 1H), 6.94 (d, J=8.1 Hz, 1H), 5.01 (q, J=6.5 Hz, 1H), 3.93 (s, 3H).
The compound was obtained in analogy to BB28 at RT for 5 hours from tert-butyl 3-[4-(2,2-dimethylpropoxy)phenyl]azetidine-1-carboxylate to get the desired compound as white solid. Used as is for next step.
The compound was obtained in analogy to method A7 a from 1-bromo-4-(neopentyloxy)benzene (CAS RN 528528-58-7) to yield the desired compound as a colorless solid. MS (ESI): m/z=264.2 [M-C4H8+H]+.
rac-Benzyl (4aS,8aS)-3-oxohexahydro-2H-pyrido[4,3-b][1,4]oxazine-6(5H)-carboxylate (125 mg, 431 μmol) was dissolved in MeOH (5 mL). The reaction solution was degassed in vacuo and backfilled with argon. Pd—C (20 mg, 188 μmol) was added under an argon atmosphere. Argon was evacuated from the reaction mixture and the reaction flask backfilled with hydrogen. The reaction mixture was stirred at RT for 15 h under a hydrogen atmosphere. The reaction mixture was filtered through a syringe filter and concentrated in vacuo to afford the desired product as a white solid (62 mg, 92.2%). MS (ESI): m/z=157.098 [M+H]+.
To a stirred solution of rac-Benzyl (3S,4S)-3-(2-chloroacetamido)-4-hydroxypiperidine-1-carboxylate (385 mg, 1.18 mmol) in dry THF (4 mL) was added NaH (67.9 mg, 1.7 mmol) at 0° C. The mixture was allowed to reach RT and then stirred for 90 min under an argon atmosphere. H2O (5 mL) was added and stirring was continued at RT for 10 min. THF was removed in vacuo from the reaction mixture. The residue was treated with DCM and the organic phase was washed with H2O and brine, dried over Na2SO4, filtered and then concentrated in vacuo. The residue was purified by flash chromatography (12 g) reversed phase column, gradient 0-100% ACN (0.1% FA) in water (0.1% FA) to afford the desired product as a white solid (133 mg, 38.9%). MS(ESI): m/z=291.3[M+H]+.
To a stirred suspension of rac-benzyl(3S,4S)-3-amino-4-hydroxypiperidine-1-carboxylate (317 mg, 1.27 mmol, synthesized according to patent US2011/59118A1) and sodium acetate (208 mg, 2.53 mmol, CAS RN 127-09-3) in a mixture of acetone (4 mL)/H2O (0.5 mL) was added dropwise a solution of chloroacetyl chloride (150 mg, 107 μL, 1.33 mmol, CAS RN 79-04-9) in acetone (3 mL) between 0-5° C. After the addition the reaction mixture was stirred at RT for 1 h and subsequently evaporated to dryness giving a yellow gum. The crude product was purified by silica gel chromatography to afford the desired product as a yellow solid (385 mg, 93%). MS (ESI): m/z=325.2 [M−H]−.
A compound of formula (I) can be used in a manner known per se as the active ingredient for the production of tablets of the following composition:
A compound of formula (I) can be used in a manner known per se as the active ingredient for the production of capsules of the following composition:
| Number | Date | Country | Kind |
|---|---|---|---|
| 18163273.8 | Mar 2018 | EP | regional |
| PCT/CN2019/075372 | Feb 2019 | CN | national |
This application is a continuation of International Application No. PCT/EP2019/057174, filed Mar. 22, 2019, which claims priority to International Application No. PCT/CN2019/075372, filed Feb. 18, 2019, and EP Application No. 18163273.8, filed Mar. 22, 2018, the disclosure of each of which is incorporated herein by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/EP2019/057174 | Mar 2019 | US |
| Child | 17025155 | US |
