AU2001258981A1 - Pharmaceutically active piperidine derivatives, in particular as modulators of chemokine receptor activity - Google Patents

Pharmaceutically active piperidine derivatives, in particular as modulators of chemokine receptor activity

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Publication number
AU2001258981A1
AU2001258981A1 AU2001258981A AU5898101A AU2001258981A1 AU 2001258981 A1 AU2001258981 A1 AU 2001258981A1 AU 2001258981 A AU2001258981 A AU 2001258981A AU 5898101 A AU5898101 A AU 5898101A AU 2001258981 A1 AU2001258981 A1 AU 2001258981A1
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alkyl
heteroaryl
phenyl
compound
alkoxy
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AU2001258981A
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Jeremy Burrows
Anne Cooper
John Cumming
Thomas Mcinally
Howard Tucker
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AstraZeneca AB
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AstraZeneca AB
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Description

PHARMACEUTICALLY ACTIVE PIPERIDINE DERIVATIVES, IN PARTICULAR AS MODULATORS OF CHEMOKINE RECEPTOR ACTIVITY
The present invention relates to heterocyclic derivatives having pharmaceutical activity, to processes for preparing such derivatives, to pharmaceutical compositions comprising such derivatives and to the use of such derivatives as active therapeutic agents.
Pharmaceutically active piperidine derivatives are disclosed in EP-A1-1013276, WOOO/08013, WO99/38514 and WO99/04794.
Chemokines are chemo tactic cytokines that are released by a wide variety of cells to attract macrophages, T cells, eosinophils, basophils and neutrophils to sites of inflammation and also play a role in the maturation of cells of the immune system. Chemokines play an important role in immune and inflammatory responses in various diseases and disorders, including asthma and allergic diseases, as well as autoimmune pathologies such as rheumatoid arthritis and atherosclerosis. These small secreted molecules are a growing superfamily of 8- 14 kDa proteins characterised by a conserved four cysteine motif. The chemokine superfamily can be divided into two main groups exhibiting characteristic structural motifs, the Cys-X-Cys (C-X-C, or α) and Cys-Cys (C-C, or β) families. These are distinguished on the basis of a single amino acid insertion between the NH-proximal pair of cysteine residues and sequence similarity.
The C-X-C chemokines include several potent chemoattractants and activators of neutrophils such as interleukin-8 (IL-8) and neutrophil-activating peptide 2 (NAP -2).
The C-C chemokines include potent chemoattractants of monocytes and lymphocytes but not neutrophils such as human monocyte chemotactic proteins 1-3 (MCP-1, MCP-2 and MCP-3), RANTES (Regulated on Activation, Normal T Expressed and Secreted), eotaxin and the macrophage inflammatory proteins lα and lβ (MlP-lα and MlP-lβ). Studies have demonstrated that the actions of the chemokines are mediated by subfamilies of G protein-coupled receptors, among which are the receptors designated CCR1, CCR2, CCR2A, CCR2B, CCR3, CCR4, CCR5, CCR6, CCR7, CCR8, CCR9, CCR10, CXCRl, CXCR2, CXCR3 and CXCR4. These receptors represent good targets for drug development since agents which modulate these receptors would be useful in the treatment of disorders and diseases such as those mentioned above.
The CCR5 receptor is expressed on T-lymphocytes, monocytes, macrophages, dendritic cells, microglia and other cell types. These detect and respond to several chemokines, principally "regulated on activation normal T-cell expressed and secreted" (RANTES), macrophage inflammatory proteins (MIP) MlP-la and MlP-lb and monocyte chemoattractant protein-2 (MCP-2).
This results in the recruitment of cells of the immune system to sites of disease. In many diseases it is the cells expressing CCR5 which contribute, directly or indirectly, to tissue damage. Consequently, inhibiting the recruitment of these cells is beneficial in a wide range of diseases.
CCR5 is also a co-receptor for HIN-1 and other viruses, allowing these viruses to enter cells. Blocking the receptor with a CCR5 antagonist or inducing receptor intemalisation with a CCR5 agonist protects cells from viral infection.
The present-invention provides a compound of formula (I):
wherein:
R1 is Cj.5 alkyl , C3.7 cycloalkyl, C3.8 alkenyl or C3.8 alkynyl, each optionally substituted with one or more of: halo, hydroxy, cyano, nitro, C3.7 cycloalkyl, ΝR8R9, C(O)R10, NR13C(O)R14, C(O)NRI7R18, NRt9C(O)NR20R21, S(O)nR22, Cw alkoxy (itself optionally substituted by heterocyclyl or C(O)NR23R24), heterocyclyl, heterocyclyloxy, aryl, aryloxy, heteroaryl or heteroaryloxy; R2 is hydrogen, C^ alkyl, C3.8 alkenyl, C3.8 alkynyl, C3.7 cycloalkyl, aryl, heteroaryl, heterocyclyl, aryl(CM)alkyl, heteroaryl(C1_4)alkyl or heterocyclyl(CM)alkyl;
R3 is Cj.8 alkyl, C2-8 alkenyl, NR45R46, C2.8 alkynyl, C3.7 cycloalkyl, C3.7 cycloalkenyl, aryl, heteroaryl, heterocyclyl, aryl(C )alkyl, heteroaryl(CM)alkyl or heterocyclyl(CM)alkyl; R46 is alkyl, C3.8 alkenyl, C3.8 alkynyl, C3-7 cycloalkyl, aryl, heteroaryl, heterocyclyl, aryl(CM)alkyl, heteroaryl(CM)alkyl or heterocyclyl(CM)alkyl; wherein the groups of R2, R3 and R46, and the heterocyclyl, aryl and heteroaryl moieties of R1, are independently optionally substituted by one or more of halo, cyano, nitro, hydroxy, S(O)qR25, OC(O)NR2δR27, NR28R29, NR30C(O)R31, NR32C(O)NR33R34, S(O)2NR35R36, NR37S(O)2R38, C(O)NR39R40, C(O)R41, CO2R42, NR^CO^44, C 6 alkyl, C3.10 cycloalkyl, C,.6 haloalkyl, Cμ6 alkoxy, Cw haloalkoxy, phenyl, phenyl(CM)alkyl, phenoxy, phenylthio, phenyl(CM)alkoxy, heteroaryl, heteroaryloxy or heteroaryl(CM)alkoxy; wherein any of the immediately foregoing phenyl and heteroaryl moieties are optionally substituted with halo, hydroxy, nitro, S(O)kC,^ alkyl, S(O)2NH2, cyano, CM alkyl, C alkoxy, C(O)NH2, C(O)NH(CM alkyl), CO2H, CO2(CM alkyl), alkyl), NHS(O)2(CM . alkyl), C(O)(ClJt alkyl), CF3 or OCF3; the C3-7 cycloalkyl, aryl, heteroaryl and heterocyclyl moieties of R1, R2 and R3 being additionally optionally substituted with C^g alkyl, C2.6 alkenyl, C2.6 alkynyl or C^ al oxy(C1_6)alkyl;
R4, R5, R6 and R7 are, independently, hydrogen, Cw alkyl {optionally substituted by halo, cyano, hydroxy, CM alkoxy, OCF3, NH2, NH(CW alkyl), N(CM alkyl)2, NHC(O)(CM alkyl), N(CM alkyl)C(OXC alkyl), NHS(O)2(CM alkyl), N(CM alkyl)S(O)2(C alkyl), CO2(C1 alkyl), C(O)NH(CM alkyl), C(O)N(CM alkyl)2, C(O)NH2, CO2H, S(O)2(C alkyl), S(O)2NH(CM alkyl), S(O)2N(CM alkyl)2, heterocyclyl or C(O)(heterocyclyl)}, S(O)2NH2, S(O)jNH(CM alkyl), C(O)N(CM alkyl)2, C(O)(CM alkyl), CO2H, CO2(CM alkyl) or C(O)(heterocyclyl); or two of R4, R5, R6 and R7 can join to form, together with the ring to which they are attached, a bicyclic ring system; or two of R4, R5, R6 and R7 can form an endocyclic bond (thereby resulting in an unsaturated ring system); X is C(O), S(O)2, C(O)C(O), a direct bond or C(O)C(6)NR47; k, m, n, p and q are, independently, 0, 1 or 2; R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, R36, R37, R38, R39, R40, R41, R42, R43 and R44 are, independently, C-_g alkyl, C3.g alkenyl, C3.8 alkynyl, C3.7 cycloalkyl, aryl, heteroaryl or heterocyclyl each or which is optionally substituted by halo, cyano, nitro, hydroxy, CM alkyl, CM alkoxy, SCH3, S(O)CH3, S(O)2CH3, NH2, NHCH3, N(CH3)2, NHC(O)NH2, C(O)NH2, NHC(O)CH3, S(O)2N(CH3)2, S(O)2NHCH3, CF3, CHF2, CH2F, CH2CF3 or OCF3; and R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, R36, R37, R39, R40, R41, R42, R43 and R44 may additionally be hydrogen;
R8, R9, R10, R13, R14, R17, R18, R19, R20, R21, R23, R24, R45 and R47 are, independently, hydrogen, alkyl {optionally substituted by halo, hydroxy, C^ alkoxy, C 6 haloalkoxy, heterocyclyl or phenyl (itself optionally substituted by halo, hydroxy, cyano, CM alkyl or C Λ alkoxy)}, phenyl (itself optionally substituted by halo, hydroxy, nitro, S(O)kCM alkyl, S(O)2NH2, cyano, CM alkyl, CM alkoxy, C(O)NH2, C(O) H(CM alkyl), CO2H, CO2(C!^ alkyl), NHC(O)(C alkyl), NHS(O)2(ClJ( alkyl), C(O)(C alkyl), CF3 or OCF3) or heteroaryl (itself optionally substituted by halo, hydroxy, nitro, S(O)kCM alkyl, S(O)2NH2, cyano, CM alkyl, CM alkoxy, C(O)NH2, C(O)NH(CM alkyl), CO2H, CO2(CM alkyl), NHC(O)(CM alkyl), NHS(O)2(CM alkyl), C(O)(C1.4 alkyl), CF3 or OCF3);
R22 is alkyl {optionally substituted by halo, hydroxy, C 6 alkoxy, C^ haloalkoxy, heterocyclyl or phenyl (itself optionally substituted by halo, hydroxy, cyano, C1 alkyl or CM alkoxy)}, phenyl (itself optionally substituted by halo, hydroxy, cyano, Ci alkyl or Cw alkoxy) or heteroaryl (itself optionally substituted by halo, hydroxy, cyano, CM alkyl or CM alkoxy); the pairs of substituents: R8 and R9, R13 and R14, R17 and R18, R20 and R21, R23 and R24, R26 and
R27, R28 and R29, R30 and R31, R32 with either R33 or R34, R33 and R34, R3S and R36, R37 and R38, R39 and R40 and R43 and R44 may, independently, join to form a ring and such a ring may also comprise an oxygen, sulphur or nitrogen atom; where for any of the foregoing heterocyclic groups having a ring -N(H)- moiety, that -N(H)- moiety may be optionally substituted by ClA alkyl (itself optionally substituted by hydroxy),
C(O)(CM alkyl), C(O)NH(CM alkyl), C(O)N(CM alkyl), or S(O)2(CM alkyl); a ring nitrogen and/or sulphur atom is optionally oxidised to form an N-oxide and/or an S- oxide; foregoing heteroaryl or heterocyclyl rings are C- or, where possible, N-linked; or a pharmaceutically acceptable salt thereof or a solvate thereof.
Certain compounds of the present invention can exist in different isomeric forms (such as enantiomers, diastereomers, geometric isomers or tautomers). The present invention covers all such isomers and mixtures thereof in all proportions.
Suitable salts include acid addition salts such as a hydrochloride, hydrobromide, phosphate, acetate, fumarate, maleate, tartrate, citrate, oxalate, methanesulphonate or p- toluenesulphonate. The compounds of the invention may exist as solvates (such as hydrates) and the present invention covers all such solvates.
Alkyl groups and moieties are straight or branched chain and are, for example, methyl, ethyl, n-propyl or iso-propyl.
Alkenyl and alkynyl groups and moieties are, for example, vinyl, allyl or propargyl. Cycloalkyl is a mono-, bi- or tri-cyclic structure such as, for example, cyclopropyl, cyclopentyl, cyclohexyl or adamantyl. Cycloalkenyl comprises one double bond and is, for example, cyclopentenyl or cyclohexenyl.
Acyl is, for example, carbonyl substituted by either C^ alkyl or optionally substituted phenyl. Heterocyclyl is. a non-aromatic 5 or 6 membered ring comprising at least one heteroatom selected from the group comprising nitrogen, oxygen and sulphur. Heterocyclyl is, for example, piperidinyl, morpholinyl, pyrrolidinyl, piperazinyl or tetrahydrofuryl.
Heteroaryl is an aromatic 5 or 6" membered ring comprising at least one heteroatom selected from the group comprising nitrogen, oxygen and sulphur. Heteroaryl is, for example, pyrrolyl, imidazolyl, pyrazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl; pyridinyl, pyrimidinyl, pyrazinyl, pyridazinyl, thienyl, furyl, quinolinyl, isoquinolinyl, dihydroisoquinolinyl, indolyl, benzimidazolyl, benzo[b] furyl, benzo[b]thienyl, phthalazinyl, indanyl, oxadiazolyl or benzthiazolyl.
Aryl is a carbocyclic aromatic ring system (for example phenyl or naphthyl). Arylalkyl is, for example, benzyl, l-(phenyl)ethyl or 2-(phenyl)ethyl.
Heteroarylalkyl is, for example, pyridinylmethyl, pyrimidinylmethyl or 2- (pyridinyl)ethyl.
When R39 and R40 join to form a ring the ring is, for example, a piperazinyl, piperidinyl, pyrrolidinyl or morpholinyl ring. In one aspect the invention provides a compound of formula (I) wherein X is C(O),
S(O)2 or a direct bond. In a further aspect X is C(O).
In another aspect the invention provides a compound of formula (I) wherein m and p are both 1.
In a further aspect the invention provides a compound of formula (I) wherein R4, R5, R6 and R7 are all hydrogen.
In yet another aspect the invention provides a compound of formula (I) wherein R2 is hydrogen, CM alkyl (optionally substituted by C3.6 cycloalkyl or phenyl), C3A alkenyl or C3 alkynyl. In another aspect R2 is hydrogen.
In another aspect the invention provides a compound of formula (I) wherein R2 is methyl, ethyl, allyl, cyclopropyl or propargyl.
In a further aspect the invention provides a compound of formula (I) wherein R2 is methyl, ethyl or allyl. In a still further aspect the invention provides a compound of formula (I) wherein R2 is C3.8 alkenyl (such as allyl) or C3.7 cycloalkyl (such as cyclopropyl). In a further aspect X is C(O).
In a still further aspect R3 is NR45R46, aryl, heteroaryl, aryl(CM)alkyl or heteroaryl(C,_ 4)alkyl; R45 is hydrogen or C 6 alkyl; R46 is aryl, heteroaryl, aryl(CM)alkyl or heteroary^C!. 4)alkyl; wherein the aryl and heteroaryl groups of R3 and R4δ are independently substituted by S(O)qR25, OC(O)NR26R27, NR32C(O)NR33R34 or C(O)R41, and optionally further substituted by one or more of halo, cyano, nitro, hydroxy, C 6 alkyl, C2.6 alkenyl, C2.6 alkynyl, C[.6 alkoxy(C1.6)alkyl, S(O)qR25, OC(O)NR26R27, NR28R29, NR30C(O)R31, NR32C(O)NR33R34, S(O)2NR35R36, NR37S(O)2R38, C(O)NR39R40, C(O)R41, CO2R42, NR43CO2R44, C3.10 cycloalkyl, Cj.6 haloalkyl, C,.6 alkoxy, haloalkoxy, phenyl, phenyl(CM)alkyl, phenoxy, phenylthio, phenyl(CM)alkoxy, heteroaryl, heteroaryl(C1_4)alkyl, heteroaryloxy or heteroaryl(C1 )alkoxy; wherein any of the immediately foregoing phenyl and heteroaryl moieties are optionally substituted with halo, hydroxy, nitro, S(O)kCM alkyl, S(O)2NH2, cyano, CM alkyl, CM alkoxy, C(O)NH2, C(O)NH(CM alkyl), CO2H, CO2(CM alkyl), NHC(O)(CM alkyl), NHS(0)2(CM alkyl), C(O)(C1-4 alkyl), CF3 or OCF3; wherein q, k, R R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, R36, R37, R38, R39, R40, R41, R42, R43 and R44 arenas defined above.
In a still further aspect R3 is NR45R46, phenyl, heteroaryl, phenyl(CM)alkyl or heteroaryl(CM)alkyl; R45 is hydrogen or alkyl; R46 is phenyl, heteroaryl, phenyl(CM)alkyl or heteroaryl(C1-4)alkyl; wherein the phenyl and heteroaryl groups of R3 and R46 are substituted by S(O)2R25, OC(O)NR26R27, NR32C(O)NR33R34 or C(O)R41, and optionally further substituted by one or more of halo, cyano, nitro, hydroxy, C[.6 alkyl, C2.6 alkenyl, C2.6 alkynyl, .g alkoxy(CI.6)alkyl, S(O)2R25, OC(O)NR26R27, NR28R29, NR30C(O)R31, NR32C(O)NR33R34, S(O)2NR35R36, NR37S(O)2R38, C(O)NR39R40, C(O)R41, CO2R42, NR^CO.R44, C3.I0 cycloalkyl, CM haloalkyl, C,.6 alkoxy or Cw haloalkoxy; wherein R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, R36, R37, R38, R39, R40, R41, R42, R43 and R44 are as defined above.
In another aspect R3 is NR45R46, phenyl, heteroaryl, phenyl(CM)alkyl or heteroaryl(Cj. 4)alkyl; R45 is hydrogen or C{_6 alkyl; R46 is phenyl, heteroaryl, phenyl(CM)alkyl or heteroaryl(ClJ()alkyl; wherein the phenyl and heteroaryl groups of R3 and R46 are substituted by S(O)2R2s, and optionally further substituted by one or more of halo, cyano, nitro, hydroxy, C,.6 alkyl, C2.6 alkenyl, C2.6 alkynyl, Cj.6 alkoxy(C,.6)alkyl, C,.g haloalkyl, haloalkoxy; wherein R25 is C,.6 alkyl. In yet another aspect R3 is NR45R46, phenyl or phenylCH2; R45 is hydrogen or C^ alkyl; R4δ is phenyl or phenylCH2; wherein the phenyl groups of R3 and R46 are mono- substituted by S(O)2R25; wherein R25 is C^ alkyl (for example methyl).
In a further aspect R3 is phenyl or phenylCH2; wherein the phenyl groups are mono- substituted (for example in the 4-position) by S(O)2R25; wherein R25 is C 6 alkyl (for example methyl).
In another aspect R3 is NR45R46, phenyl, heteroaryl, phenyl(CM)alkyl or heteroaryl(Cι„ 4)alkyl; R45 is hydrogen or alkyl; R46 is phenyl, heteroaryl, phenyl(CM)alkyl or heteroaryl(CM)alkyl; wherein the phenyl and heteroaryl groups of R3 and R46 are substituted by S(O)2NR35R36, and optionally further substituted by one or more of halo, cyano, nitro, hydroxy, Cj.6 alkyl, C2.6 alkenyl, C2.6 alkynyl, C,_6 alkoxy^^alkyl, Cι_6 haloalkyl, C 6 alkoxy or haloalkoxy; wherein R35 and R36 are, independently, hydrogen, C s alkyl, C3.8 alkenyl, C3.8 alkynyl, C3.7 cycloalkyl, aryl, heteroaryl or heterocyclyl each or which is optionally substituted by halo, cyano, nitro, hydroxy, CM alkyl, C alkoxy, SCH3, S(O)CH3, S(O)2CH3, NH2, NHCH3, N(CH3)2, NHC(O)NH2, C(O)NH2, NHC(O)CH3, S(O)2N(CH3)2, S(O)2NHCH3, CF3, CHF2, CH2F, CH2CF3 or OCF3.
In yet another aspect R3 is NR45R46, phenyl or phenylCH2; R45 is hydrogen or Cj.2 alkyl; R46 is phenyl or phenylCH2; wherein the phenyl groups of R3 and R46 are mono- substituted by S(O)2NR35R36; wherein R35 and R36 are, independently, hydrogen, C^ alkyl, C3.8 alkenyl, C3.8 alkynyl, C3.7 cycloalkyl, aryl, heteroaryl or heterocyclyl each or which is optionally substituted by halo, cyano, nitro, hydroxy, CM alkyl, CM alkoxy, SCH3, S(O)CH3, S(O)2CH3, NH2, NHCH3, N(CH3)2, NHC(O)NH2, C(O)NH2, NHC(O)CH3, S(O)2N(CH3)2, S(O)2NHCH3, CF3, CHF2, CH2F, CH2CF3 or OCF3; where, in a further aspect, R35 is neither hydrogen nor CM alkyl. In another aspect the present invention provides a compound of formula (I) wherein X is C(O); and R3 is C3.7 cycloalkyl, (CH2)3-aryl, (CH2)3-heteroaryl, (CH2)aryl, (CH2)-heteroaryl, (CH2)3C(=O)NH-aryl, (CH2)3C(=O)NH-heteroaryl, (CH2)C3.10 cycloalkyl, (CH2)sNO2, (CH2)5NC(=O)CM alkyl, CH2-CH=CH-aryl, CH2-CH=CH-heteroaryl, NH-aryl, NH- heterocyclyl, NH-allyl, NHCH2-aryl or NHCH2-heteroaryl; wherein aryl, heteroaryl and heterocyclyl groups are optionally substituted as defined above.
In a further aspect the present invention provides a compound of formula (I) wherein X is C(O); and R3 is (CH2)3-aryl, (CH2)3-heteroaryl, (CH2)aryl, (CH2)-heteroaryl, (CH2)3C(=O)NH-aryl, (CH2)3C(=O)NH-heteroaryl, NH-aryl, NH-heterocyclyl, NHCH2-aryl or NHCH2-heteroaryl; wherein aryl, heteroaryl and heterocyclyl rings are optionally substituted as defined above.
In a still further aspect the present invention provides a compound of formula (I) wherein X is C(O); and R3 is CH2-phenyl (wherein the phenyl ring is optionally substituted at the 3-, 4- and/or 5- position with one or more substituents recited for aryl above), (CH2)3- phenyl, (CH2)3-oxadiazole-aryl, (CH2)3-oxadiazole-heteroaryl, (CH2)3C(=O)NH-phenyl, NHCH2-phenyl, NHCH2-heteroaryl or NH-phenyl (wherein the phenyl ring is optionally substituted at the 3-, 4- and/or 5- position with one or more substituents recited for aryl above); wherein aryl and heteroaryl rings are optionally substituted as defined above; phenyl rings are, unless stated otherwise, optionally substituted with one or more substituents recited for aryl above.
In yet another aspect the present invention provides a compound of formula (I) wherein X is C(O); and R3 is CH2-phenyl [wherein the phenyl ring is optionally substituted at the 3-, 4- and/or 5- position with one or more of Cl, Br, F, OH, CM alkoxy (such as OMe or OEt), CN, S(O)2(CM alkyl) (such as S(O)2Me), S(O)(CM alkyl) (such as S(O)Me), S(CM alkyl) (such as SMe), S(O)2NH2, S(O)2N(CM alkyl)2 (such as S(O)2NMe2), CM alkyl (such as Me), CF3, OCF3, NO2, NHC(O)(CM alkyl) (such as NHCOMe), C(O)(CM alkyl) (such as C(O)Me), S(O)2CF3, S(O)CF3, SCF3, C(O)NH2 or CO2(CM alkyl) (such as CO2Me)], NHCH2- phenyl [wherein the phenyl ring is optionally substituted at the 3-, 4- and/or 5- position with one or more of Cl, Br, F, OH, CM alkoxy (such as OMe or OEt), CN,.S(O)2(C1.4 alkyl) (such as S(O)2Me), S(O)(CM alkyl) (such as S(O)Me), S(CM alkyl) (such as SMe), S(O)2NH2, S(O)2N(C1 alkyl)2 (such as S(O)2NMe2), CF3, OCF3, NO2, NHC(O)(CM alkyl) (such as NHC(O)Me), C(O)(CM alkyl) (such as C(O)Me), S(O)2CF3, S(O)CF3, SCF3, C(O)NH2 or CO2(CM alkyl) (such as CO2Me)] or NH-phenyl [wherein the phenyl ring is optionally substituted at the 3-, 4- and/or 5- position with one or more of F, Cl, CM alkoxy (such as OMe) orN(CM alkyl)2 (such as NMe2)].
In another aspect the present invention provides a compound of formula (I) wherein X is C(O); and R3 is CH2-phenyl [wherein the phenyl ring is optionally substituted at the 4- position with Cl, Br, F, OH, OMe, CN, S(O)2Me, S(O)2NH2, S(O)2NMe2, CF3, OCF3, NO2, NHC(O)Me or CO2Me], NHCH2-phenyl [wherein the phenyl ring is optionally substituted at the 4-position with Cl, Me, F or OMe] or NH-phenyl [wherein the phenyl ring is optionally substituted at the 4-position with F, Cl, OMe or NMe2].
In a further aspect the invention provides a compound as hereinbefore defined wherein R1 is d-6 alkyl {optionally substituted by cyano, NR13*C(O)R14*, NR15*R16*, phenyl (itself optionally substituted by halo, hydroxy, nitro, S(O)kC1-4 alkyl, S(O)2NH2, cyano, d- alkyl, d-4 alkoxy, C(O)NH2, C(O)NH(C alkyl), CO2H, CO2(CM alkyl), NHC(O)(d-4 alkyl), NHS(O)2(Cι-4 alkyl), C(O)(C1-4 alkyl), CF3 or OCF3) or heteroaryl (itself optionally substituted by halo, hydroxy, nitro, S(O)kCi-4 alkyl, S(O)2NH2, cyano, Cι-4 alkyl, d- alkoxy, C(O)NH2, C(O)NH(d-4 alkyl), CO2H, CO2(d-4 alkyl), NHC(O)(d-4 alkyl), NHS(O)2(C!-4 alkyl), C(O)(C!-4 alkyl), CF3, OCF3 or phenyl (itself optionally substituted by halo, hydroxy,' nitro, S(O)kC!-4 alkyl, S(O)2NH2, cyano, d-4 alkyl, d-4 alkoxy, C(O)NH2, C(O)NH(d- alkyl), CO2H, CO2(d-4 alkyl), NHC(O)(d-4 alkyl), NHS(O)2(d-4 alkyl), C(O)(d-4 alkyl), CF3 or OCF3))} or C2_6 alkenyl {optionally substituted by phenyl (itself optionally substituted by halogen, hydroxy, nitro, Cμ alkyl, d- alkoxy or di(d-4 alkyl)amino)}; R13* is C3-4 alkyl; R14* is phenyl optionally substituted by halo, hydroxy, nitro, S(O)kd- alkyl, S(O)2NH2, cyano, d-4 alkyl, C,.4 alkoxy, C(O)NH2, C(O)NH(d-4 alkyl), CO2H, CO2(d-4 alkyl), NHC(O)(C1-4 alkyl), NHS(O)2(d-4 alkyl), C(O)(C1-4 alkyl), CF3 or OCF3; and R15* and R16* are, independently, C1-4 alkyl or phenyl (optionally substituted by halo, hydroxy, nitro, S(O)kd-4 alkyl, S(O)2NH2, cyano, d-4 alkyl, d-4 alkoxy, C(O)NH2, C(O)NH(d-4 alkyl), CO2H, CO2(C!-4 alkyl), NHC(O)(d-4 alkyl), NHS(O)2(d-4 alkyl), C(O)(d-4 alkyl), CF3 or OCF3). Heteroaryl is, for example, pyrrolyl, furyl, indolyl or pyrimidinyl.
In another aspect R1 is a three-carbon chain which optionally carries one methyl group along its length (for example a methyl group is carried on the carbon that bonds to the nitrogen atom of the ring shown in formula (I)) wherein said three-carbon chain is optionally substituted as described for R1 above.
In a still further aspect the invention provides a compound as hereinbefore defined wherein R1 is 2,6-dimethoxybenzyl, 2,4,6-trimethoxybenzyl, 2,4-dimethoxy-6-hydroxybenzyl, 3-(4-dimethylamino-phenyl)prop-2-enyl, ( 1 -phenyl-2,5-dimethylpyrrol-3-yl)methyl, 2- phenylethyl, 3-phenylpropyl, 3-R/S-phenylbutyl, 3-cyano-3,3-diphenylpropyl, 3-cyano-3- phenylpropyl, 4-(N-methylbenzamido)-3-phenylbutyl or 3,3-diphenylpropyl.
Further examples of R1 include each individual partial structure presented in Schedule I and each individual partial structure presented in Schedule I can be combined with any definition of X, R2, R3 R4, R5, R6, R7, m or p as herein defined. In another aspect the invention provides a compound as hereinbefore defined wherein R1 is 3-R/S-phenylbutyl or, preferably, 3,3-diphenylpropyl. In a further aspect R1 is 3-(S)- phenylbutyl. In yet a further aspect R1 is 3,3-diphenylpropyl.
In a still fiirther aspect the present invention provides a compound of formula (I) wherein R1 is a hereinbefore defined; R2 is ethyl, allyl or cyclopropyl (for example allyl or cyclopropyl); and R3 is NHCH2C6H5, NHCH2(4-F-C6H4), NHCH2(4-S(O)2CH3-C6H4), NHCH2(4-S(O)2NH2-C6H4), CH2C6H5, CH2(4-F-C6H4), CH2(4-S(O)2CH3-C6H4) or CH2(4- S(O)2NH2-C6H4) {for example NHCH2(4-S(O)2CH3-C6H4) or CH2(4-S(O)2CH3-C6H4)}.
In yet another aspect the present invention provides a compound of formula (I) wherein R1 is 3,3-diphenylpropyl, X is CO, R2 is Cx_8 alkyl, and R3 is as hereinbefore defined.
In a further aspect the present invention provides a compound of formula (I) wherein R1 is 3,3-diphenylpropyl, X is CO, R2 is allyl, and R3 is as hereinbefore defined.
In a still further aspect the present invention provides a compound of formula (I) wherein R1 is 3,3-diphenylpropyl or 3-R/S-phenylbutyl, X is C(O), R2 is H, and R3 is as hereinbefore defined.
In another aspect the present invention provides a compound of formula (I) wherein R1 is 3,3-diphenylpropyl or 3-R/S-phenylbutyl, X is C(O), R2 is H or methyl, and R3 is NR45R46 (such as an amine group as hereinbefore defined for R3).
In yet another aspect the present invention provides a compound of formula (la):
wherein X, R2 and R3 are as defined above.
In a further aspect the present invention provides a compound of formula (lb):
wherein X, R2 and R3 are as defined above In a still further aspect the present invention provides a compound of formula (Ic):
wherein X, m, R1, R2 and R3 are as defined above.
In yet another aspect the present invention provides a compound of formula (Id):
wherein X, R2 and R3 are as defined above; and R14 is hydrogen, alkyl {optionally substituted by halo, hydroxy, Cμg alkoxy, haloalkoxy, heterocyclyl or phenyl (itself optionally substituted by halo, hydroxy, cyano, C1 alkyl or CM alkoxy)}, phenyl (itself optionally substituted by halo, hydroxy, nitro, S(O)kC1 alkyl, S(O)2NH2, cyano, CM alkyl, CM alkoxy, C(O)NH2, C(O)NH(CM alkyl), CO2H, CO2(CM alkyl), NHC(O)(CM alkyl), NHS(O)2(Cw alkyl), C(O)(CM alkyl), CF3 or OCF3), heteroaryl (itself optionally substituted by halo, hydroxy, nitro, S(O)kC1 alkyl, S(O)2NH2, cyano, Cl alkyl, CM alkoxy, C(O)NH2, C(O)NH(CM alkyl), CO2H, CO2(CM alkyl), NHC(O)(CM alkyl), NHS(O)2(CM alkyl), C(O)(CM alkyl), CF3 or OCF3) or NR20R21; wherein R20 and R21, together with the nitrogen to which they are attached, join to form an aziridine, azetidine or pyrrolidine ring. The following compounds illustrate the invention.
TABLE I Table I lists compounds of formula (la):
wherein X, R2 and R3 are listed in the table. Mass Spectrum details are given for certain compounds of Table I.
TABLE II Table II comprises 409 compound's of formula (lb):
wherein the variables X, R2 and R3 for each compound of Table II are the same as the correspondingly numbered compound in Table I. Mass Spectrum details are given for certain compounds of Table II.
TABLE m
Table III discloses compounds of formula (Ic):
wherein the variables R', X, R2 and R3 are as defined in the Table below. Mass Spectrum details are given for certain compounds of Table III.
Ref: Stefan Sanczuk, Hubert K. F. Hermans (Janssen Pharmaceutica N. N., Belg.). Chemical Abstracts 87: 53094.
TABLE IN Table IN discloses compounds of formula (Id):
wherein the variables R14, X, R2 and R3 are as defined in the Table below. Mass Spectrum details are given for certain compounds in Table IV.
The following abbreviations are used in Tables I to IV: Me = methyl Et = ethyl
Pr = propyl Bu = butyl cPr = cyclopropyl cBu = cyclobutyl
The compounds of formula (I), (la), (lb), (Ic) or (Id) can be prepared as shown in the processes on pages marked Schemes 1 to 14 below. (In Scheme 10 suitable coupling agents include ΗATU (O-(7-Azabenzotriazol-l-yl)-NNN':N'-tetramethylurom'um hexafluorophosphate) and PyBROP (bromo-trz'_.-pyrrolidinophosphonium hexafluorophosphate) which may be employed according to Example 26.) The starting materials for these processes are either commercially available or can be prepared either by literature methods or by adapting literature methods. In the Schemes the variables R1*, R2* and R3* have been used where the group R1, R2 or R3 is, respectively, CH^R1*, CH2R2* or CH2R3*; Ac is CH3C(O); and Ar1 and Ar2 denote aromatic rings which are optionally substituted. Although Schemes 1-14 are depicted for m and p = 1, and R4, R5, R6 and R7 as hydrogen, it is clear that they can be readily adapted for alternative values of m, p, R4, R5, R6 and R7.
In a further aspect the invention provides processes for preparing the compounds of formula (I), (la), (lb), (Ic) and (Id). Many of the intermediates in the processes are novel and these are provided as further features of the invention.
The compounds of the invention have activity as pharmaceuticals, in particular as modulators (such as agonists, partial agonists, inverse agonists or antagonists) of chemokine receptor (especially CCR5) activity, and may be used in the treatment of autoimmune, inflammatory, proliferative or hyperproliferative diseases, or immunologically-mediated diseases (including rejection of transplanted organs or tissues and Acquired Immunodeficiency Syndrome (AIDS)). Examples of these conditions are: (1) (the respiratory tract) obstructive diseases of airways including: chronic obstructive pulmonary disease (COPD) (such as irreversible COPD); pulmonary fibrosis; asthma {such as bronchial, allergic, intrinsic, extrinsic or dust asthma, particularly chronic or inveterate asthma (for example late asthma or airways hyper-responsiveness)}; bronchitis {such as eosinophilic bronchitis}; acute, allergic, atrophic rhinitis or chronic rhinitis including rhinitis caseosa, hypertrophic rhinitis, rhinitis purulenta, rhinitis sicca or rhinitis medicamentosa; membranous rhinitis including croupous, fibrinous or pseudomembranous rhinitis or scrofoulous rhinitis; seasonal rhinitis including rhinitis nervosa (hay fever) or vasomotor rhinitis; sarcoidosis; farmer's lung and related diseases; nasal polyposis; fibroid lung or idiopathic interstitial pneumonia; (2) (bone and joints) arthrides including rheumatic, infectious, autoimmune, seronegative spondyloarthropathies (such as ankylosing spondylitis, psoriatic arthritis or Reiter's disease), Behcet's disease, Sjogren's syndrome or systemic sclerosis; (3) (skin and eyes) psoriasis, atopic dermatitis, contact dermatitis or other eczmatous dermitides, seborrhoetic dermatitis, Lichen planus, Phemphigus, bullous Phemphigus, Epidermolysis bullosa, urticaria, angiodermas, vasculitides erythemas, cutaneous eosinophilias, uveitis, Alopecia areata or vernal conjunctivitis; (4) (gastrointestinal tract) Coeliac disease, proctitis, eosinophilic gastro-enteritis, mastocytosis, Crohn's disease, ulcerative colitis, irritable bowel disease or food-related allergies which have effects remote from the gut (for example migraine, rhinitis or eczema); (5) (Allograft rejection) acute and chronic following, for example, transplantation of kidney, heart, liver, lung, bone marrow, skin or cornea; or chronic graft versus host disease; and/or (6) (other tissues or diseases) Alzheimer's disease, multiple sclerosis, atherosclerosis, inhibiting the entry of viruses into target cells, Acquired Immunodeficiency Syndrome (AIDS), Lupus disorders (such as lupus erythematosus or systemic lupus), erythematosus,
Hashimoto's thyroiditis, myasthenia gravis, type I diabetes, nephrotic syndrome, eosinophilia fascitis, hyper IgE syndrome, leprosy (such as lepromatous leprosy), Peridontal disease, Sezary syndrome, idiopathic thrombocytopenia pupura, disorders of the menstrual cycle, glomerulonephritis or cerebral malaria. The compounds of the present invention are also of value in inhibiting the entry of viruses (such as human immunodeficiency virus (HIV)) into target calls and, therefore, are of value in the prevention of infection by viruses (such as HIV), the treatment of infection by viruses (such as HIV) and the prevention and/or treatment of acquired immune deficiency syndrome (AIDS). According to a further feature of the invention there is provided a compound of the formula (I), (la), (lb), (Ic) or (Id), or a pharmaceutically acceptable salt thereof or a solvate thereof, for use in a method of treatment of a warm blooded aiiimal (such as man) by therapy (including prophylaxis).
According to a further feature of the present invention there is provided a method for modulating chemokine receptor activity (especially CCR5 receptor activity) in a warm blooded animal, such as man, in need of such treatment, which comprises administering to said animal an effective amount of a compound of the present invention, or a pharmaceutically acceptable salt thereof or a solvate thereof.
The present invention also provides the use of a compound of the formula (I), (la), (lb), (Ic) or (Id), or a pharmaceutically acceptable salt thereof or a solvate thereof, as a medicament, especially a medicament for the treatment of transplant rejection, respiratory disease, psoriasis or rheumatoid arthritis (especially rheumatoid arthritis). [Respiratory disease is, for example, COPD, asthma {such as bronchial, allergic, intrinsic, extrinsic or dust asthma, particularly chronic or inveterate asthma (for example late asthma or airways hyper- responsiveness)} or rhinitis {acute, allergic, atrophic rhinitis or chronic rhinitis including rhinitis caseosa, hypertrophic rhinitis, rhinitis purulenta, rhinitis sicca or rhinitis medicamentosa; membranous rhinitis including croupous, fibrinous or pseudomembranous rhinitis or scrofoulous rhinitis; seasonal rhinitis including rhinitis nervosa (hay fever) or vasomotor rhinitis}; and is particularly asthma or rhimtisj.
In another aspect the present invention provides the use of a compound of the formula (I), (la), (lb), (Ic) or (Id), or a pharmaceutically acceptable salt thereof or a solvate thereof, in the manufacture of a medicament for use in therapy (for example modulating chemokine receptor activity (especially CCR5 receptor activity (especially rheumatoid arthritis)) in a warm blooded animal, such as man).
The invention also provides a compound of the formula (I), (la), (lb), (Ic) or (Id), or a pharmaceutically acceptable salt thereof or a solvate thereof, for use as a medicament, especially a medicament for the treatment of rheumatoid arthritis.
In another aspect the present invention provides the use of a compound of the formula (I), (la), (lb) or (Ic), or a pharmaceutically acceptable salt thereof or a solvate thereof, in the manufacture of a medicament for use in therapy (for example modulating chemokine receptor activity (especially CCR5 receptor activity (especially rheumatoid arthritis)) in a warm blooded animal, such as man).
The invention further provides the use of a compound of formula (I), (la), (lb), (Ic) or (Id), or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for use in the treatment of:
(1) (the respiratory tract) obstructive diseases of airways including: chronic obstructive pulmonary disease (COPD) (such as irreversible COPD); asthma {such as bronchial, allergic, intrinsic, extrinsic or dust asthma, particularly chronic or inveterate asthma (for example late asthma or airways hyper-responsiveness)}; bronchitis {such as eosinophilic bronchitis}; acute, allergic, atrophic rhinitis or chronic rhinitis including rhinitis caseosa, hypertrophic rhinitis, rhinitis purulenta, rhinitis sicca or rhinitis medicamentosa; membranous rhinitis including croupous, fibrinous or pseudomembranous rhinitis or scrofoulous rhinitis; seasonal rhinitis including rhinitis nervosa (hay fever) or vasomotor rhinitis; sarcoidosis; farmer's lung and related diseases; nasal polyposis; fibroid lung or idiopathic interstitial pneumonia;
(2) (bone and joints) arthrides including rheumatic, infectious, autoimmune, seronegative spondyloarthropathies (such as ankylosing spondylitis, psoriatic arthritis or Reiter's disease), Behcet's disease, Sjogren's syndrome or systemic sclerosis;
(3) (skin and eyes) psoriasis, atopic dermatitis, contact dermatitis or other eczmatous dermitides, seborrhoetic dermatitis, Lichen planus, Phemphigus, bullous Phemphigus, Epidermolysis bullosa, urticaria, angiodermas, vasculitides erythemas, cutaneous eosinophilias, uveitis, Alopecia areata or vernal conjunctivitis; (4) (gastrointestinal tract) Coeliac disease, proctitis, eosinophilic gastro-enteritis, mastocytosis, Crohn's disease, ulcerative colitis, irritable bowel disease or food-related allergies which have effects remote from the gut (for example migraine, rhinitis or eczema);
(5) (Allograft rejection) acute and chronic following, for example, transplantation of kidney, heart, liver, lung, bone marrow, skin or cornea; or chronic graft versus host disease; and/or
(6) (other tissues or diseases) Alzheimer's disease, multiple sclerosis, atherosclerosis, Acquired Immunodeficiency Syndrome (AIDS), Lupus disorders (such as lupus erythematosus or systemic lupus), erythematosus, Hashimoto's thyroiditis, myasthenia gravis, type I diabetes, nephrotic syndrome, eosinophilia fascitis, hyper IgE syndrome, leprosy (such as lepromatous leprosy), Peridontal disease, Sezary syndrome, idiopathic thrombocytopenia pupura or disorders of the menstrual cycle; in a warm blooded animal, such as man.
The present invention further provides a method of treating a chemokine mediated disease state (especially a CCR5 mediated disease state) in a warm blooded animal, such as man, which comprises administering to a mammal in need of such treatment an effective amount of a compound of formula (I), (la), (lb), (Ic) or (Id), or a pharmaceutically acceptable salt thereof or solvate thereof.
In order to use a compound of the invention, or a pharmaceutically acceptable salt thereof or solvate thereof, for the therapeutic treatment of a warm blooded animal, such as man, in particular modulating chemokine receptor (for example CCR5 receptor) activity, said ingredient is normally formulated in accordance with standard pharmaceutical practice as a pharmaceutical composition.
Therefore in another aspect the present invention provides a pharmaceutical composition which comprises a compound of the formula (I), (la), (lb), (Ic) or (Id), or a pharmaceutically acceptable salt thereof or a solvate thereof (active ingredient), and a pharmaceutically acceptable adjuvant, diluent or carrier. In a further aspect the present invention provides a process for the preparation of said composition which comprises mixing active ingredient with a pharmaceutically acceptable adjuvant, diluent or carrier. Depending on the mode of administration, the pharmaceutical composition will preferably comprise from 0.05 to 99 %w (per cent by weight), more preferably from 0.05 to 80 %w, still more preferably from 0.10 to 70 %w, and even more preferably from 0.10 to 50 %w, of active ingredient, all percentages by weight being based on total composition.
The pharmaceutical compositions of this invention may be administered in standard manner for the disease condition that it is desired to treat, for example by topical (such as to the lung and/or airways or to the skin), oral, rectal or parenteral administration. For these purposes the compounds of this invention may be formulated by means known in the art into the form of, for example, aerosols, dry powder formulations, tablets, capsules, syrups, powders, granules, aqueous or oily solutions or suspensions, (lipid) emulsions, dispersible powders, suppositories, ointments, creams, drops and sterile injectable aqueous or oily solutions or suspensions.
A suitable pharmaceutical composition of this invention is one suitable for oral administration in unit dosage form, for example a tablet or capsule which contains between 0.1 mg and lg of active ingredient.
In another aspect a pharmaceutical composition of the invention is one suitable for intravenous, subcutaneous or intramuscular injection.
Each patient may receive, for example, an intravenous, subcutaneous or intramuscular dose of O.Olmgkg"1 to lOOmgkg"1 of the compound, preferably in the range of O.lmgkg"1 to 20mgkg"' of this invention, the composition being administered 1 to 4 times per day. The intravenous, subcutaneous and intramuscular dose may be given by means of a bolus injection. Alternatively the intravenous dose may be given by continuous infusion over a period of time. Alternatively each patient will receive a daily oral dose which is approximately equivalent to the daily parenteral dose, the composition being administered 1 to 4 times per day.
The following illustrate representative pharmaceutical dosage forms containing the compound of formula (I), (la), (lb), (Ic) or (Id), or a pharmaceutically acceptable salt thereof or a solvent thereof (hereafter Compound X), for therapeutic or prophylactic use in humans:
(a)
(e)
Buffers, pharmaceutically-acceptable cosolvents such as polyethylene glycol, polypropylene glycol, glycerol or ethanol or complexing agents such as hydroxy-propyl β- cyclodextrin may be used to aid formulation.
The above formulations may be obtained by conventional procedures well known in the pharmaceutical art. The tablets (a)-(c) may be enteric coated by conventional means, for example to provide a coating of cellulose acetate phthalate.
The invention will now be illustrated by the following non-limiting examples in which, unless stated otherwise:
(i) temperatures are given in degrees Celsius (°C); operations were carried out at room or ambient temperature, that is, at a temperature in the range of 18-25°C; (ii) organic solutions were dried over anhydrous magnesium sulphate; evaporation of solvent was carried out using a rotary evaporator under reduced pressure (600-4000 Pascals; 4.5-30 mm Hg) with a bath temperature of up to 60°C;
(iii) chromatography unless otherwise stated means flash chromatography on silica gel; thin layer chromatography (TLC) was carried out on silica gel plates; where a "Bond Elut" column is referred to, this means a column containing lOg or 20g of silica of 40 micron particle size, the silica being contained in a 60ml disposable syringe and supported by a porous disc, obtained from Varian, Harbor City, California, USA under the name "Mega Bond Elut SI". Where an "IsoluteTM SCX column" is referred to, this means a column containing benzenesulphonic acid (non-endcapped) obtained from International Sorbent Technology Ltd., 1st House, Duffryn Industial Estate, Ystrad Mynach, Hengoed, Mid Clamorgan, UK. Where "ArgonautT PS-trø-amine scavenger resin" is referred to, this means a tris-(2- aminoethyl)amine polystyrene resin obtained from Argonaut Technologies Inc., 887 Industrial Road, Suite G, San Carlos, California, USA.
(iv) in general, the course of reactions was followed by TLC and reaction times are given for illustration only; (v) yields, when given, are for illustration only and are not necessarily those which can be obtained by diligent process development; preparations were repeated if more material was required;
(vi) when given, Η NMR data is quoted and is in the form of delta values for major diagnostic protons, given in parts per million (ppm) relative to tetramethylsilane (TMS) as an internal standard, determined at 300 MHz using perdeuterio DMSO (CD3SOCD3) as the solvent unless otherwise stated; coupling constants (J) are given in Hz; (vii) chemical symbols have their usual meanings; SI units and symbols are used; (viii) solvent ratios are given in percentage by volume; (ix) mass spectra (MS) were run with an electron energy of 70 electron volts in the chemical ionisation (APCI) mode using a direct exposure probe; where indicated ionisation was effected by electrospray (ES); where values for m z are given, generally only ions which indicate the parent mass are reported, and unless otherwise stated the mass ion quoted is the positive mass ion - (M+H)+; (x) LCMS characterisation was performed using a pair of Gilson 306 pumps with Gilson 233 XL sampler and Waters ZMD4000 mass spectrometer. The LC comprised water symmetry 4.6x50 column C18 with 5 micron particle size. The eluents were: A, water with 0.05% formic acid and B, acetonitrile with 0.05% formic acid. The eluent gradient went from 95% A to 95% B in 6 minutes. Where indicated ionisation was effected by electrospray (ES); where values for m/z are given, generally only ions which indicate the parent mass are reported, and unless otherwise stated the mass ion quoted is the positive mass ion - (M+H)+ and (xi) the following abbreviations are used:
DMSO dimethyl sulphoxide;
DMF N-dimethylformamide;
DCM dichloromethane;
THF tetrahdydrofuran;
DIPEA . NN-diisopropylethylamine;
NMP N-methylpyrrolidinone;
HATU O-(7-Azabenzotriazol- 1 -yl)-N,NN ,N-teframemylurorήurn hexafluorophosphate;
Boc tert-butoxycarbonyl
MeOH methanol; EtOH ethanol; and
EtOAc ethyl acetate.
EXAMPLE 1 This Example illustrates the preparation of N-[l-(3,3-diphenylpropyl)-4-piperidinyl]-
N-methylisonicotinamide (Compound No. 1 of Table I).
To a solution of isonicotinic acid (0.6mg, 5μM) in NMP (50μL) was added a solution of4-methylamino-l-(3,3-diphenylpropyl)piperidine dihydrochloride (Method A) (1.9mg, 5μM) and diisopropylethylamine (8μL, 45μM) in NMP (50μL) followed by a solution of bromo-tra-pyrrolidinophosphomum hexafluorophosphate (4.7mg, lOμM) in NMP (lOOμL). After 15h the reaction mixture was concentrated to give the title compound which was characterised by LCMS; MS: 415.
The method of Example 1 can be repeated using different acids in place of isonicotinic acid, or different piperidines (such as 4-methylamino-l-(3-R/S-phenylbutyl)piperidine dihydrochloride (Method B), 4-propargylamino-l-(3-R/S-phenylbutyl)piperidine (Method C), 4-allylamino-l-(3,3-diphenylpropyl)piperidine (Method D), 4-allylamino-l-(3-R/S- phenylbutyl)piperidine (Method E) or 4-(cyclopropylmethyl)amino-l-(3-R/S- phenylbutyl)piperidine (Method R)) in place of 4-methylamino-l-(3,3- diphenylpropyl)piperidine dihydrochloride.
EXAMPLE 2 This Example illustrates the preparation of N'-(2,4-difluorophenyl)-N-[l-(2,6- dimethoxybenzyl)piperidin-4-yl]-N-phenethylurea (Compound o. 1 of Table III). To a solution of 2,6-dimethoxybenzaldehyde (1.7mg, lOμM) in NMP (lOOμL) was added a solution of 4-piperidinyl-N-(2-phenylethyl)-2,4-difluorophenylurea.trifluoroacetic acid (Method F) (2.4mg, 5μM) and. diisopropylethylamine (lμL, 5.5μM) in ΝMP (lOOμL). After 1.5h a solution of sodium triacetoxyborohydride (2.8mg, 15μM) in acetonitrile: ΝMP, 1:1 (lOOμL) was added. After 16h at room temperature the reaction mixture was concentrated to give the title compound which was characterised by LCMS ; MS : 510. The procedure described in Example 2 can be repeated using different aldehydes in place of 2,6-dimethoxybenzaldehyde or other piperidines (such as 4-methylamino-l-(3,3- diphenylpropyl)piperidine.dihydrochloric acid (Method A) or 4-amino-l-(3,3- diphenylpropyl)piperidine.ditrifluoroacetic acid (Method G)) in place of 4-ρiperidinyl-N-(2- phenylethyl)-2,4-difluorophenylurea trifluoroacetic acid.
EXAMPLE 3 This Example illustrates the preparation of N-[l-(3,3-diphenylpropyl)-piperidin4-yl]- N-methyl-2-(trifluoromethoxy)benzenesulphonamide (Compound No. 53 of Table I). To a solution of 2-trifluoromethoxybenzenesulphonyl chloride (1.3mg, 5μM) in acetonitrile (50μL) was added a solution of 4-methylamino-l-(3,3-diphenylpropyl)- piperidine.dihydrochloride (Method A) (1.9mg, 5μM) and NN-diisopropylethylamine (1.8μL, lOμM) in pyridine (50μL). After 15h the reaction mixture was concentrated to give the title compound which was characterised by LCMS; MS: 533.
The procedure described in Example 3 can be repeated using different sulphonylchlorides (such as 4-acetamido,3-chlorobenzenesulphonyl chloride) in place of 2- trifluoromethoxybenzenesulphonyl chloride or different piperidines (such as 4-amino-l-(3,3- diphenylpropyl)ρiperidine.ditrifluoroacetic acid (Method G)) in place of 4-methylamino-l- (3,3-diphenylpropyl)piperidine dihydrochloride.
EXAMPLE 4 This Example illustrates the preparation of N'-(3,4-dichlorophenyl)-N-[l-(3,3- diphenylpropyl)piperidin-4-yl]-N-memylurea (Compound No. 68 of Table I). A solution of 4-methylamino-l-(3,3-diphenylpropyl)piperidine.dihydrochloride
(Method A) (1.9mg, 5μM) and DIPEA (1.8μL, lOμM) in DCM (lOOμL) was added to 3,4- dichlorophenylisocyanate (19mg, O.lmM). After 15h DCM (800μL) was added and ArgonautTM PS-t -amine scavenger resin (0.66g) was added and the reaction mixture agitated. The resin swelled considerably and the mixture was left to stand in order for the DCM to evaporate. Methanol (0.5ml) was added and the mixture agitated; the organic layer was then transferred to another vessel and concentrated to give the title compound as an oil, which was characterised by LCMS; MS: 496.
The procedure described in Example 4 can be repeated using various isocyanates or carbamoyl chlorides in place of 3,4-dichlorophenylisocyanate or other piperidines (such as 4- amino-l-(3,3-diρhenylpropyl)piperidine.ditrifluoroacetic acid (Method G), 4-amino-l-(3-R S- phenylbutyl)piρeridine ditrifluoroacetic acid salt (Method H)) in place of 4-methylamino-l- (3,3-diphenylpropyl)piρeridine dihydrochloride.
EXAMPLE 5
This Example illustrates the preparation of N-[l-(3,3-diphenylpropyl)-piperidin-4-yl]- N-methylthiophene-2-carboxamide (Compound No. 96 of Table I).
A solution of 4-methylamino-l-(3,3-diphenylpropyl)piperidine (the free base of the compound described in Method A) (O.lg, 0.32mmol) in dichloromethane (4.0 ml) was added to 2-thiophene carboxylic acid (l.Ommol). To the resulting mixture was added a solution of diisopropylcarbodiimide (0.15ml, l.Ommol) in dichloromethane (1.0ml) followed by a solution of 1-hydroxybenzotriazole (0.135g, l.Ommol) in DMF (2.0ml) and the resulting mixture stirred at ambient temperature for 18 hours. The reaction mixture was then applied to an ISOLUTETM SCX column (5g) which was then washed with MeOH (30ml) followed by a 1 :4 mixture of aqueous ammonia and methanol (30ml). Evaporation of the final wash gave the title compound as an oil (lOlmg, 75% yield); MS: 419.
The procedure described in Example 5 can be repeated using different carboxylic acids in place of 2-thiophene carboxylic acid or other piperidines (such as 4-amino-l-(3,3- diphenylpropyl)piperidine (free base from Method G), 4-methylamino- 1 -(3-R S- phenylbutyl)piperidine (free base from Method B) or 4-amino-l-(3-R/S- phenylbutyl)piperidine (free base from Method H)) in place of 4-methylamino-l-(3,3- diρhenylpropyl)piperidine.
EXAMPLE 6
This Example illustrates the preparation of N-[l-(3,3-diphenylpropyl)-4-piperidinyl]- (N-methyl)-3-cnlorophenylurea (Compound 144 of Table I). A solution of 4-methylamino-l-(3,3-diphenylpropyl)piperidine (the free base of the compound described in Method A) (O.lg; 0.32mmol) in DCM (4.0 ml) was added to 3- chlorophenyl isocyanate (1.Ommol). The resulting mixture was stirred at ambient temperature for 18 hours. The reaction mixture was then applied to an ISOLUTETM SCX column (5g) which was then washed with methanol (30ml) followed by a 1 :4 mixture of aqueous ammonia and MeOH (30ml). Evaporation of the final wash gave the product as an oil (112mg, 76% yield); MS: 462.
The procedure described in Example 6 can be repeated using different isocyanates or carbamoyl chlorides in place of 3-chlorophenylisocyanate or other piperidines (such as 4- methylamino-l-(3-R/S-phenylbutyl)piperidine (free base from Method B)) in place of 4- methylamino- 1 -(3,3-diphenylpropyl)piperidine.
EXAMPLE 7 This Example illustrates the preparation of N-[l-(3,3-diphenylpropyl)-4-piperidinyl]-
N-methyl-4-(phenylmethoxy)phenylacetamide (Compound No. 268 of Table I).
To a solution of 4-methoxyρhenylacetic acid (0.8mg, 5μmol) in NMP (50μL) was added a solution of 4-methylamino-l-(3,3-diphenylpropyl)piperidine dihydrochloride (Method A) (1.9mg, 5μmol) and DIPEA (8μL, 45μmol) in NMP (50μL) followed by a solution of bromo-tra-pyrrolidino-phosphonium hexafluorophosphate (4.7mg, lOμmol) in NMP (lOOμL). After 15h the reaction mixture was concentrated to give the title compound which was characterised by LCMS; MS: 533.
EXAMPLE 8 This Example illustrates the preparation of N-[l-(3,3-diphenylpropyl)-4-piperidinyl]- N-allyl-4-fluorophenylacetamide (Compound No. 269 of Table I).
To 4-fluorophenylacetic acid (lmmol) was added 4-allylamino-l-(3,3- diphenylpropyl)piperidine (O.lg; 0.3mmol) in dichloromethane (2ml). A solution of 1- hydroxybenztriazole (0.135g; 0. lmmol) in DMF (2ml) and di-isopropyl-carbodiimide (0.126ml; lmmol) in DCM was then added. The resulting mixture was stirred at room temperature overnight. The mixture was then applied to an ISOLUTE™ SCX cartridge (5g) and washed with methanol (30ml). The product was then eluted with 15% methylamine in ethanol. Purification was achieved by BondElut chromatography eluting with a solvent mixture of DCM to.5% methanol in DCM yielding the title compound (72mg, 50%), which was characterised by LCMS; MS: 471.
EXAMPLE 9 This Example illustrates the preparation of N-[l-(3,3-diphenylpropyl)-4-piperidinyl]- N-ethyl-4-trifluoromethoxyphenylacetamide (Compound No. 282 of Table I).
To a solution of 4-trifluoromethoxyphenylacetic acid (188mg, 0.92mmol) in dichloromethane (2ml) was added 1-hydroxybenztriazole (124mg) followed by diisopropylcarbodiimide (0.14ml) and DMF (1ml). The mixture was stirred at room temperature for lh, then a solution of 4-ethylamino-l-(3,3-diphenylpropyl)piperidine (147mg, 0.46mmol) in dichloromethane (2ml) was added. The resulting mixture was stirred overnight then purified by eluting through an ISOLUTE™ SCX column with methanol followed by 2% aqueous ammonia in methanol. The product was then dissolved in ethyl acetate (2 ml) and treated with 1M HCI in diethyl ether (4 ml) giving the hydrochloride salt which was isolated by filtration, yielding N-[l-(3,3-diphenylpropyl)-4-piperidinyl]-N-ethyl-4- trifluoromethoxyphenylacetamide hydrochloride as a foam, 210mg, 87%; ΝMR: 1.1 (m ,3H), 1.7 (m, 2H), 2.1 (m, 2H), 3.0 (m, 4H), 3.5 (m, 5H), 3.8 (m, 4H), 4.3 (m, 1H), 7.1 (m, 2H), 7.3 (m, 12H); MS: 525.
EXAMPLE 10 This Example illustrates the preparation of N-(4-fluorophenylmethyl)-N-[l-(3,3- diphenylpropyl)-4-piperidinyl]-N-methylurea (Compound No. 388 of Table I).
To 4-fluorophenyl isocyanate (0.75mmol) was added a solution of 4-methylamino-l- (3,3-diphenylpropyl)piperidine (0.19g; 0.5mmol) in DCM (4ml). The resulting mixture was stirred at room temperature overnight. The resulting reaction mixture was then applied to an ISOLUTE™ SCX cartridge (5g) and washed with methanol (30ml). The product was then eluted using a 4:1 mixture of methanol and aqueous ammonia. Purification was achieved by BondElut chromatography eluting with a solvent mixture of DCM to 5% methanol in DCM to give the title compound (26 mg, 11%) which was characterised by LCMS; MS: 446.
EXAMPLE 11 This Example illustrates the preparation of N'-(2,4-difluorophenyl)-N-[l-(3,3- diphenylpropyl)-4-piperidinyl]-N-phenethylurea (Compound No. 314 of Table I). To a solution of N'-(2,4-difluorophenyl)-N-(4-piperidinyl)-N-phenethylurea trifluoroacetic acid salt (300mg, 0.63mmol) in DMF (5ml) was added 3,3-diphenyl-l- bromopropane (360mg, 1.26mmol) followed by DIPEA (0.442ml, 2.52mmol). The resulting mixture was stirred at room temperature for 24h. The reaction mixture was partitioned between water and dichloromethane, the organic phase was washed with water, dried (MgSO4) and concentrated. The residue was purified by eluting through a silica gel cartridge with ethyl acetate followed by 5% ethanol in ethyl acetate to give the title compound as a gum, 80mg; NMR: 1.6 (m, 6H), 4.9 (m, 5H), 2.2 (m, 3H), 2.8 (m, 3H), 3.9 (m, 2H), 7.0 (m, 1H), 7.2 (m, 15H), 7.4 (m, 1H), 8.0 (s, 1H); MS: 554.
EXAMPLE 12 This Example illustrates the preparation of N-(4-trifluoromethylphenylmethyl)-N-[l- (3,3-diphenylpropyl)-4-piperidinyl]-N-ethylurea (Compound No. 323 of Table I).
A solution of 4-trifluoromethylphenylacetic acid (0.8mmol) in dry THF (2.0ml) was cooled to 0°C and triethylamine (0.11ml; 0.8mmol) in THF (1.0ml) and diphenylphosphorylazide (0.17ml; O.δmmol) in THF (2ml) were added. Stirring was continued for 30min. The mixture was allowed to warm to ambient temperature before toluene (5ml) was added and the mixture heated to 100°C for lh. After cooling to room temperature, a solution of 4-ethylamino-l-(3,3-diphenylρropyl)piperidine (0.2g; 0.6mmol) in ethyl acetate (2ml) was added and the mixture allowed to stir at room temperature for 72h. The reaction mixture was then washed with aq. NaHCO3 solution, dried and evaporated. Purification was by passage through a BondElut cartridge (Si) eluting with a gradient from 0 - 5% methanol in DCM, yielding the title compound (153mg, 49%) which was characterised by LCMS; MS: 524.
EXAMPLE 13 This Example illustrates the preparation of pyrrolidine carboxylic acid N-[l -(3,3- diphenylpropyl)-4-piperidinyl]-N-methyl amide (Compound No. 391 of Table I). To diethylcarbamoyl chloride (0.75mmol) was added a solution of 4-methylamino-l-
(3,3-diphenylpropyl)piperidine (0.19g; 0.5mmol) in DCM (4ml) followed by triethylamine (0.14ml; lmmol). The resulting mixture was stirred at room temperature overnight. The resulting reation mixture was then applied to an ISOLUTE™ SCX cartridge (5g) and washed with methanol (30ml). The product was then eluted using a 4:1 mixture of methanol and 0.88 aqueous ammonia. Purification was achieved by BondElut chromatography eluting with a solvent mixture of DCM to 5% methanol in DCM to give the product (79 mg, 39%) which was characterised by LCMS; MS: 406. EXAMPLE 14 This Example illustrates the preparation of N-[l-(3,3-diphenylpropyl)-4-piperidinyl]- N-methyl-4-(cycloρropylaminosulfonyl)phenylacetamide (Compound No. 354 of Table I).
N-[ 1 -(3 ,3-Diphenylpropyl)-4-piperidinyl]-N-methyl-4-fluorosulfonylphenyl-acetamide (0.005mmol, in lOOμL MeCΝ) and cyclopropylamine (O.Olmmol in lOOμL MeCΝ) were mixed and allowed to stand overnight. The solvent was then evaporated to dryness under Genevac high vacuum.
EXAMPLE 15 This Example illustrates the preparation of N-[l-(3,3-diphenylpropyl)-4-piperidinyl]- N-methyl-4-(2-hydroxyethylaminocarbonyl)phenylacetamide hydrochloride (Compound No. 385 of Table I).
A mixture of N-[l-(3,3-diphenylpropyl)-4-piperidinyl]-N-methyl-4- methoxycarbonylphenylacetamide (O.lg; 0.2mmol) was heated at 60°C in a mixture of ethanolamine (l.OmL) and acetonitrile (l.OmL) for 12 hours. After cooling the mixture was partitioned between ethyl acetate (5mL) and water (8mL). The organic layer was washed a further twice with water and dried (Νa^O before purification on a silica BondElut, eluting with a gradient from 5 - 25% methanol in dichloromethane. The purified product was dissolved in ethyl acetate and treated with HCI in diethyl ether before evaporation to give the title compound as a solid (68 mg, 62%) which was characterised by LC-MS; MS: 514. EXAMPLE 16
This Example illustrates the preparation of 4-(2-[4-methanesulfonylphenyl])-pentenoic acid N-[l-(3,3-diphenylpropyl)-4-piperidinyl]amide hydrochloride salt (Compound No. 390 of Table I).
To a cooled (5°C) solution of N-[l-(3,3-diphenylpropyl)-4-piperidinyl]-4- methanesulfonylphenylacetamide (1.61g, 3.28mmol) in DMF (15mL) was added sodium hydride (131mg 60% dispersion, 3.6mmol). The resulting mixture was stirred for 5 minutes before the addition of allyl bromide (0.3mL, 3.44mmol). The reaction mixture was stirred at room temperature for 2 h then quenched with water. The mixture was extracted twice with ethyl acetate and the combined organic extracts were washed with water and brine, dried and evaporated. The residue was purified by silica gel chromatography (eluent 3% MeOH in DCM). The crude product was treated with ethereal HCI to afford the title compound (0.902g); ΝMR (CDC13): 1.2 (m, 2H), 1.9 (m, 2H), 2.1 (m, 2H), 2.3 (m, 4H), 2.5 (m, 1H), 2.8 ( , 3H), 3.0 (s, 3H), 3.4 (m, 1H), 3.8 (m, 1H), 4.0 (dd, 1H), 5.1 (m, 2H), 5.4 (d, 1H), 5.7 (m, 1H), 7.2 (m, 10H), 7.6 (d, 2H), 7.9 (d, 2H); MS: 531.
EXAMPLE 17 This Example illustrates the preparation of N'-phenylmethyl-N-[l-(3,3- diphenylpropyl)-4-piperidinyl]-N-allylurea (Compound No. 245 of Table II):
3-Phenylbutyraldehyde (0.2g, 1.36mmol) was added to a solution of N'-phenylmethyl- N-[piperidin-4-yl]-N-allylurea hydrochloride (370mg, 1.36mmol) in methanol (20ml). After 15 mins sodium triacetoxyborohydride (430mg, 2.0mmol) was added portionwise over 15mins and the reaction was left to stir for 16h. Water (5ml) was added to the mixture and the methanol was removed in vacuo. The solution was diluted with water (30ml), and partitioned with EtOAc (2x40ml). The organic fractions were combined and washed with brine (30ml), dried (MgSO4) and concentrated. The oil was dissolved in MeOH (5ml) and then applied to an ISOLUTE™ SCX column (5g) which was then washed with MeOH (30ml) followed by a 1 :4 mixture of aqueous ammonia and methanol (30 ml). Addition of ethereal HCI to the final wash, followed by evaporation gave the title compound as a gum (152mg, 0.38mmol); MS: 406.
EXAMPLE 18 This Example illustrates the preparation of N-[l -(3-phenyl-3-[4-fluorophenyl]-3- hydroxypropyl)-4-piperidinyl]-N-ethyl-4-methanesulfonylphenylacetamide (Compound No. 11 of Table III).
To a solution of N-[l-(3-[4-fluorophenyl]-3-oxopropyl)-4-piperidinyl]-N-ethyl-4- methanesulfonylphenylacetamide hydrochloride (470mg, 0.92mmol) in THF (40mL) under an inert atmosphere was added phenylmagnesium bromide (lOmL, 1M in THF) at room temperature. After stirring for lh saturated aqueous sodium bicarbonate solution was added and the resulting mixture was extracted with ethyl acetate. The organic phase was dried (MgSO4) and concentrated. The title compound was obtained by silica column chromatography, eluting with 10% methanol in ethyl acetate yielding 120mg. ΝMR (CDC13): 1.18 and 1.23 (t, 3H), 1.65 (m, 2H), 1.84 (m, 2H), 2.42 (m, 2H), 3.02 (s, 3H), 3.35 (m, 2H), 3.65 (m, 4H), 3.68 and 3.78 (s, 2H), 4.73 (t, 2H), 6.97 (m, 2H), 7.2-7.4 (m, 9H), 7.90 (d, 2H); MS: 553. EXAMPLE 19 This Example illustrates the preparation of N-[l-(3-phenyl-4-pentenyl)-4-piperidinyl]- N-methyl-4-fluorophenylacetamide (Compound No. 12 of Table III).
5-Bromo-3-phenylpent-l-ene (131mg, 0.58mmol), 4-(N-(4-fluorophenyl-acetamido)- N-methyl)aminopiperidine (73mg, 0.29mmol), potassium carbonate (120mg, 0.87mmol) and tetrabutylammonium iodide (5mg) were stirred in DMF (3ml). After 16h, water was added and the mixture extracted with EtOAc (2x20ml). The organics were combined and washed with water, dried (MgSO4), concentrated and purified by Bond Elut chromatography (eluent DCM, followed by 2.5% EtOH/DCM and finally 5% EtOH/DCM) to afford the title compound as an oil (55mg, 0.14mmol); MS: 395.
EXAMPLE 20 This Example illustrates the preparation of N-[l-(3-phenyl-3-azetidinylpropyl)-4- piperidinyl]-N-methyl-4-fluorophenylacetamide dihydrochloride (Compound No. 13 of Table III). To a solution of N-[l -(3-phenyl-3-chloropropyl)-4-piperidinyl]-N-methyl-4- fluorophenylacetamide (120mg, 0.3mmol) in DCM (5mL) was added azetidine (0.12mL, 1.8mmol) and the resulting mixture was stirred at room temperature for 18h. The reaction mixture was washed with water, dried (MgSO4) concentrated, and purified by Bond Elut chromatography (eluent 5% MeOH/DCM followed by 10% MeOH/DCM) to afford the title compound as an oil which was then treated with ethereal HCI to provide N-[l-(3-phenyl-3- azetidinylpropyl)-4-piperidinyl]-N-methyl-4-fluorophenylacetamide dihydrochloride as a white solid (35 mg, 24%); ΝMR (d6-DMSO, 373K): 1.5-1.65 (m, 2H), 1.85-2.1 (m, 4H), 2.55-2.9 (m, 8H), 3.1-3.2 (m, 1H), 3.25-3.35 (m, 1H), 3.6-3.75 (m, 5H), 4.1-4.2 (m, 2H), 7.0- 7.1 (m, 2H), 7.2-7.3 (m, 2H), 7.35-7.5 (m, 5H); MS: 424. EXAMPLE 21
This Example illustrates the preparation of N-[l-(3-phenyl-3-[4-fluorophenyl]propyl)- 4-piperidinyl]-N-ethyl-4-methanesulfonylρhenylacetamide (Compound No. 15 of Table III). To a solution of 4-(N-(4-fluorophenylacetamido)-N-methyl)aminopiperidine (I43mg, 1.74mmol) in DMF (5mL) was added 3-phenyl-3-(4-fluorophenyl)-l-bromopropane (Method N) (420mg, 1.5mmol) and K2CO3 (300mg). The reaction was then stirred overnight and poured onto water (20mL). Extracted into EtOAc, washed with water (20mL), brine (20mL), and dried over MgSO4. The solvents were evaporated and the crude product was purified by Bond Elut chromatography (eluent 5% MeOH/DCM) to afford the title compound as a sticky gum, (148mg, 20%); NMR: 1.65 (2H, m), 2.20 (IH, broad t), 3.2-2.6 (9H, m), 3.8-3.6 (6H, m), 4.10 (IH, m) and 7.4-7.2 (13H, m); MS: 463.
EXAMPLE 22 This Example illustrates the preparation of N-[l-(3,3-di-[4-fluorophenyl]propyl)-4- piperidinyl]-N-ethyl-4-methanesulfonylphenylacetamide (Compound No. 16 of Table III).
To a DMF solution of l-(3,3-di-(4-fluorophenyl)propyl)-4-(methylamino)piperidine (250mg, 0.72mmol, in 5mL) was added 4-fluorophenylacetic acid (115mg, 0.75mmol), HATU (285mg, 0.75mmol), and DIPEA (130μl). The reaction was stirred overnight and poured into water (20mL). The organics were extracted into EtOAc (20mL) and dried over MgSO4. The desired product was then precipitated from the EtOAc by addition of 2M HCI in Et2O, to afford a pale yellow gum (139mg, 46%); NMR: 1.60 (2H, m), 2.20 (2H, m), 2.75 (3H, s), 3.3-3.7 (12H, m), 6.80 (2H, m) and 7.3-7.0 (10H, m); MS: 481.
EXAMPLE 23 This Example illustrates the preparation of N-[ 1 -(N, N-diphenyl-2-ethylamino)-4- piperidinyl]-N-allyl-4-methanesulfonylphenylacetamide (Compound No. 18 of Table III).
To a mixture of N-(4-piperidinyl)-N-allyl-4-methanesulfonylphenylacetamide (0.25g, 0.74mmol) and 4-methyl-2-pentanone (lOmL) was added potassium carbonate (0.3 lg), potassium iodide (lOOmg) and N-(2-bromoethyl)diphenylamine (0.21g) and the resulting mixture was stirred and heated to reflux for 18 h. After cooling, water was added and the volatiles removed by evaporation. The residue was extracted three times with ethyl acetate and the combined extracts were dried and concentrated to give an oil which was purified by eluting through a silica gel column with 1% methanol in dichloromethane then 5% methanol in dichloromethane to give the title compound (73mg); ΝMR: 1.5 (m, 4H), 2.1 (m, 2H), 2.5 (m, 2H), 3.1 (s, 3H), 3.8 (m, 7H), 3.9 (s, 2H), 5.1 (m, 2H), 5.8 (m, IH), 6.9 ( , 6H), 7.2 (m, 4H), 7.4 (d, 2H), 7.8 (d, 2H); MS: 532.
EXAMPLE 24 This Example illustrates the preparation of N-[l-(N-phenyl-N-[2-(4- hydroxyphenyl)ethylcarbonyl]-2-ethylamino)-4-piperidinyl]-N-ethyl-4- methanesulfonylphenylacetamide (Compound No. 20 of Table III).
To 3-(4-hydroxyphenyl)propanoic acid (0. lmmol) was added DMF (5μL) followed by oxalyl chloride (lmL of a 0.1M solution in DCM, 0. lmmol) and the resulting mixture was shaken at room temperature for 2h. lOOμL Of this mixture was then added to lOOμL of a solution of N- [ 1 -(N-phenyl-2-ethylamino)-4-piperidinyl] -N-ethyl-4- methanesulfonylphenylacetamide (230mg, 0. mmol) and triethylamine (0.334mL, 2.4mmol) in DCM (12mL). The resulting mixture left at room temperature for 20 h then water (250μL) and DCM (250μL) were added and the mixture was shaken. The aqueous phase was removed and the organic phase was concentrated giving the title compound which was characterised by LC-MS; MS: 591.
EXAMPLE 25 This Example illustrates the preparation of N-[l-(3-phenyl-3-aminopropyl)-4- piperidinyl]-N-ethyl-4-methanesulfonylphenylacetamide dihydrochloride (Compound No. 23 of Table III).
To a solution of 3-phenyl-3-Bocaminopropanal (513mg, 2.0mmol) and N-(4- piperidinyl)-N-ethyl-4-methanesulfonylphenylacetamide (645mg, 2.0mmol) in methanol (15mL) was added acetic acid (0.2mL) and the resulting mixture was stirred at room temperature for 1 h. Sodium triacetoxyborohydride (844mg, 4.0mmol) was added and the mixture was stirred at room temperature for 18 h then evaporated. The residue was partitioned between DCM and water, and the organic phase was washed with brine, dried and concentrated. The residue was suspended in 4M HCI in dioxane (20mL) and methanol (5mL) was added. The resulting mixture was heated to reflux for 7 h, then cooled to room temperature and concentrated giving an oily residue which was purified by silica gel chromatography (eluent 5% MeOH /DCM then 10% MeOH/DCM) yielding the title compound as a solid (675 mg); ΝMR (d6 DMSO at 373K): 1.1 (t, 3H), 1.5 (m, 2H), 1.9 (m, 2H), 2.0 (m, IH), 2.3 (m, 2H), 3.0 (m, IH), 3.2 (m, 4H), 3.3 (q, 2H), 3.9 (s, 2H), 4.0 (m, IH), 4.4 (m, IH), 7.4 (m, 3H), 7.5 (m, 4H), 7.9 (m, 2H); MS: 458. EXAMPLE 26
This Example illustrates the preparation of N-[l-(3-phenyl-3-benzoylaminopropyl)-4- piperidinyl]-N-ethyl-4-methanesulfonylphenylacetamide (Compound o. 1 of Table IN).
A solution of benzoic acid (0.005mmol) in ΝMP (50μL) was added to a solution of HATU (O.Olmmol) and diisopropylethylamine (0.03mmol) in ΝMP (lOOμL). To the resulting mixture was added N-[l -(3-phenyl-3-aminopropyl)-4-piperidinyl]-N-ethyl-4- methanesulfonylphenylacetamide dihydrochloride (Example 25; 0.005mmol) in ΝMP (lOOμL). The mixture was left at room temperature for 18 h, then evaporated. The residue was partitioned between DCM (250μL) and water (250μL) and the phases separated. The organic phase was concentrated giving the title compound which was characterised by LCMS; MS: 562.
EXAMPLE 27 This Example illustrates the preparation of N-[ 1 -(N-Phenyl-2-ethylamino)-4- piperidinyl]-N-ethyl-4-methanesulfonylphenylacetamide (Compound No. 24 of Table III).
To a mixture of N-(4-piperidinyl)-N-ethyl-4-methanesulfonylphenylacetamide (2.0 g, 6.2 mmol) and N-(2-chloroethyl)aniline hydrochloride (1.2 g, 6.2 mmol) (J. Med. Chem. 1965, 173) in 4-methyl-2-pentanone (15 mL) was added potassium carbonate (2.56 g, 18.6 mmol) and potassium iodide (150 mg, 0.9 mmol) and the resulting mixture stirred at reflux for 20 h. After cooling to room temperature the solid was removed by filtration and the filtrate concentrated. The residue was purified by Bond Elut chromatography (eluent 5% MeOH/DCM) to afford, after trituration with diethyl ether, the title compound as a white solid (1.30 g, 50%); ΝMR (d6 DMSO, 373K): 1.1 (t, 3H), 1.4 (m, 2H), 1.8 (m, 2H), 2.1 (m, 2H), 2.5 (m, 2H), 3.1 (m, 5H), 3.3 (q, 2H), 3.8 (s, 2H), 5.0 (m, IH), 6.6 (m, 3H), 7.1 (dd, 2H), 7.5 (d, 2H), 7.8 (d, 2H); MS: 444.
Compound No. 25 of Table III was prepared according to the method of Example 27 using N-(4-piperidinyl)-N-ethyl-4-fluorophenylacetamide. NMR: 1.0 and 1.5 (t, 3H), 1.3 (m, IH) 1.5 (m, IH), 1.7 (m, 2H), 2.0 (m, 2H), 2.4 (m, 2H), 2.9 (m, 2H), 3.1 (m, 2H), 3.2 (m, 2H), 3.6 and 3.7 (s, 2H), 4.1 (m, IH), 5.2 (br s, IH), 6.5 (m, 3H), 7.0 (dd, 2H), 7.1 (dd, 2H), 7.2 (m, 2H); MS: 384.
EXAMPLE 28 This Example illustrates the preparation of Compound No. 26 of Table III.
To a solution ofN-[l-(3-phenyl]-3-oxopropyl)-4-piperidinyl]-N-ethyl-4- methanesulfonylphenylacetamide hydrochloride (5.00g, 10. lmmol) in methanol (150mL) was added sodium borohydride (0.96g, 25.4mmol) portionwise. The resulting mixture was stirred at room temperature for 20h. Water (lOmL) was added and the mixture was evaporated. The residue was purified by silica column chromatography (gradient elution from ethyl acetate to 50% ethyl acetate/MeOH) to give the title compound (3.92g, 84%); ΝMR: (CDC13): 1.14 and 1.23 (t, 3H), 1.56 (m, IH), 1.75 (m, 2H), 1.83 (m, 3H), 1.98 (m, IH), 2.20 (m, IH), 2.56 (m, IH), 2.66 (m, IH), 3.02 (s, 3H), 3.10 (m, IH), 3.18 (m, IH), 3.31 (q, 2H), 3.57 and 4.49 (m, IH), 3.79 and 3.80 (s, 2H), 4.94 (m, IH), 7.23 (m, IH), 7.34 (m, 4H), 7.44 (d, 2H) and 7.90 (d, 2H); MS: 459.
EXAMPLE 29
This Example illustrates the preparation of N-[l-(4,4-diphenyl-but-2-yl)-4- piperidinyl]-N-ethyl-4-methanesulfonylphenylacetamide hydrochloride (Compound No. 27 of Table III).
N-(4-Piperidinyl)-N-ethyl-4-methanesulfonylphenylacetamide (323mg, lmmol) was dissolved in DCM (10ml). Acetic acid (1ml) and 4,4-diphenyl-2-butanone (384mg, 1.5mmol) was added followed by sodium triacetoxyborohydride (516mg, 2. lmmol). The reaction mixture was stirred at room temperature for 7 days. Water (10ml) was added and the layers separated. The organic phase was washed with brine, dried (MgSO4) and evaporated to dryness. The residue was purified by Bond Elut chromatography (eluent 5% MeOH/DCM). The resultant oily residue was dissolved in a small amount of DCM, IM HCI in diethyl ether was added and the mixture concentrated to yield the title compound as a white solid (120mg, 22%); ΝMR (d6-DMSO, 373K): 1.0-1.2 (m, 6H), 1.5- 2.1 (m, 6H), 2.5 - 3.0 (m, 6H), 3.1 (s, 3H), 3.3 (q, 2H), 3.8 (s, 2Hs), 4.1 (t, IH) 7.1 ( , 2H), 7.2-7.4 (m, 8H), 7.5 (d, 2H), 7.9 (d, 2H); MS: 533. EXAMPLE 30
This Example illustrates the preparation of N-[l-(4-phenyl-but-2-yl)-4-piperidinyl]-N- ethyl-4-methanesulfonylphenylacetamide (Compound No. 28 of Table III).
To a mixture of N-(4-piperidinyl)-N-ethyl-4-methanesulfonylphenylacetamide (324mg, lmmol), 4-phenyl-2-butanone (0.22ml, 1.5mmol), sodium triacetoxyborohydride (318mg, 1.5mmol) and acetic acid (0.11ml, 2mmol) in DCM (8ml) was added a little MgSO4 and the resulting mixture heated to reflux for 48h. The reaction mixture was eluted through a column of silica gel (isohexane then 89%DCM/10%MeOH/l%ΝH4OH) yielding the title compound (60mg); NMR (CDC13): 1.1 and 1.2 (t, 3H), 1.3 (t, 3H), 1.6 (br m, 2H), 1.8 (m, IH), 2.0 (s, 2H), 2.1 (m, 2H), 2.6 (br m, 3H), 3.0 (s, 3H), 3.2 (br m, 2H), 3.3 (q, 2H), 3.8 (s, 2H), 4.5 (m, IH), 7.2 (m, 3H), 7.3 (m, 2H), 7.4 (m, 2H) and 7.9 (m, 2H); MS: 457. EXAMPLE 31 This Example illustrates the preparation of N-[l-(3-[3-trifluoromethylphenyl]-butyl)- 4-piperidinyl]-N-ethyl-4-methanesulfonylphenylacetamide (Compound No. 29 of Table III). To a solution of N-(4-piperidinyl)-N-ethyl-4-methanesulfonylphenylacetamide (680mg, 2.1mmol) in MeOH/DCM (10ml, 1 :1) was added 3-(3- trifluoromethylphenyl)butyraldehyde (Method BP) (500mg, 2.3mmol) and acetic acid (0.25ml). The resulting mixture was stirred at room temperature for 30min. then sodium triacetoxyborohydride (735mg, 3.2mmol) was added. The resulting mixture was stirred at room temperature for 2h then quenched with water (5ml) and concentrated to a third of the volume. The residual mixture was extracted with DCM and the organic extracts washed with saturated ΝaHCO3 solution and brine and evaporated to give the title compound (260mg); NMR (CDC13): 1.18 (t, 3H), 1.3 (t, 3H), 1.5 (m, IH), 1.7 (m, 6H), 2.0 (m, 2H), 2.2 (m, 2H), 2.8 (m, 3H), 3.05 (s, 3H), 3.3 ( , 2H), 3.8 (d, 2H), 7.4 (m, 6H), 7.9 (d, 2H); NMR: 525.
Compound No. 30 of Table III: NMR (CDC13): 1.18 (t, 3H), 1.3 (t, 3H), 1.5 (m, IH), 1.7 (m, 8H), 2.2 (m,2H), 2.7 (m, IH), 2.9 (m, 2H), 3.05 (s, 3H), 3.3 (q, 2H), 3.8 (d, 2H), 7.05 (d, IH),
7.2 (m, 3H), 7.45 (m,2H), 7.9 (d,2H); MS: 491.
Compound No. 31 of Table III: NMR (CDC13): 1.18 (t, 3H), 1.3 (t, 3H), 1.5 (m, IH), 1.7 ( , 8H), 2.2 (m, 2H), 2.7 (m, IH), 2.9 (m, 2H), 3.05 (s, 3H), 3.3 (q, 2H), 3.8 (d, 2H), 7.2 (d, 3H),
7.3 (m, 2H), 7.45 (m,2H), 7.9 (d, 2H); MS: 457.
Compound No. 32 of Table III: NMR (CDC13): 1.18 (t, 3H), 1.3 (t, 3H), 1.5 (m, IH), 1.7 (m, 8H), 2.2 (m, 2H), 2.7 (m, IH), 2.9(m, 2H), 3.05 (s, 3H), 3.3 (q, 2H), 3.8 (d, 2H), 7.0 (d, IH) 7.35 (d, IH), 7.45 (d, 2H), 7.9 (d, 2H); MS: 525.
EXAMPLE 32 This Example illustrates the preparation of N-[ 1 -(3,3-diphenylpropyl)-3-pyrrolidinyl]- N-ethyl-4-methanesulfonylphenylacetamide (Compound No. 33 of Table III). To a solution of 4-methanesulfonylphenylacetic acid (l.Olg, 4.72mmol) in DCM
(20ml) was added carbonyldiimidazole (765mg, 4.72mmol) and the resulting mixture stirred at room temperature for 2h. A solution of 3-amino-l-(3,3-diphenylpropyl)pyrrolidine di- (trifluoroacetic acid) salt (Method BQ) (2.4g, 4.72mmol) and triethylamine (1.43g, 11.4mmol) in DCM (10ml) was added and the resulting mixture stirred at room temperature for 2h. The mixture was washed twice with water (50ml), dried and evaporated. The residue was purified by silica column chromatography (eluent DCM then ethyl acetate) giving the title compound (1.6g); NMR: 1.5 (m, IH), 2-2.2 (m, 6H), 2.6 (m, 2H), 3.5 (s, 2H), 3.95 (t, IH), 4.1(m, 2H),7.1-7.3 (m 10H), 7.5(d, 2H), 7.8(d, 2H), 8.3 (d, IH); MS: 477.
EXAMPLE 33 This Example illustrates the preparation of N-[l-(3-[4-chlorophenyl]-3-[4- pyridyl]propyl)-4-piperidinyl]-N-ethyl-4-methanesulfonylphenylacetamide (Compound No. 34 of Table III).
N-(4-Piperidinyl)-N-ethyl-4-methanesulfonylphenylacetamide (480mg, 1.47mmol) was dissolved in DCM (40ml). Acetic acid (6ml) and 3-(4-chlorophenyl)-3-(4- pyridyl)propionaldehyde (Method BR) (2.2mmol) was added and the mixture stirred at room temperature for 30min. followed by the addition of sodium triacetoxyborohydride (340mg, 1.6mmol). The reaction mixture was stirred at room temperature for 2h. The reaction mixture was eluted through a column of silica gel (ethyl acetate then 89%DCM7 10%MeOH/ l%ΝH4OH) yielding the title compound (60mg); NMR (CDC13): 1.1 and 1.3 (t, 3H), 1.5 (br m, IH), 1.8 (m, 4H), 2.2 (m, 4H), 2.9 (m, 2H), 3.0 (s, 3H), 3.3 (q, 2H), 3.5 (brm, IH), 3.8 (m, 2H), 4.0 (m, IH), 4.4 (br m, IH), 7.1 (m, 4H), 7.3 (m, 2H), 7.5 (m, 2H), 7.9 (m, 2H) and 8.5 (m, 2H); MS: 554.
Starting materials are commercially available, have been described in the literature or can be prepared by adaptation of literature methods. Examples of literature methods include: P. Richter, Ch. Garbe and G. Wagner, E. Ger. Pharmazie, 1974, 29(4), 256-262; C. Oniscu, D. Nicoara and G. Funieru, "4-(Ureidosulfonyl)phenylacetic acid and its ureide", R079- 966646, (Romanian document); and M. A. Zahran, M. M. Ali, Y. A. Mohammed and A. A. Shehata, Int. J. Chem., 1993, 4(3), 61.
Method A 4-Methylamino- 1 -N-(3,3-diphenylpropyl)piperidine dihydrochloride
To a solution of 4-tert-butoxycarbonylamino-l-N-(3,3-diphenylpropyl)piperidine (Method I) (15.9g, 40mmol) in THF (300ml) was added lithium aluminium hydride (60ml, IM solution in THF, 60mmol) and the mixture was refluxed. After 5h the reaction mixture was cooled and sodium hydroxide was added carefully. The resultant granular precipitate was filtered off and the filtrate partitioned between water and EtOAc. The organic layer was dried (MgSO4) and concentrated to a half of the original volume. IM HCI in diethyl ether was then added to give the title compound as a white solid (13.8g, 37mmol); MS: 310. Method B 4-Methylamino- 1 -N-(3-R S-phenylbutyl)piperidine dihydrochloride To a solution of 4-tert-butoxycarbonylamino- 1 -N-(3 -R/S-phenylbutyl)piperidine
(Method J) (22 g, 66 mmol) in THF (500ml) was added lithium aluminium hydride (100ml, IM solution in THF, 0.1 mol) and the mixture was refluxed. After 5h the reaction mixture was cooled and 3M sodium hydroxide and water were added carefully. The resultant granular precipitate was filtered off and the filtrate partitioned between water and EtOAc. The organic layer was dried (MgSO4) and concentrated to a half of the original volume. IM HCI in diethyl ether was then added to give the title compound as a white solid (21 g, 66 mmol); ΝMR: 1.2 (d, 3H), 2.0 (m, 6H), 2.8 (m, 4H), 3.4 (m, 7H), 7.1 (m, 5H), 9.3 (br s, ΪH); MS: 247. Method C 4-Propargylamino- 1 -N-(3 -R/S-phenylbutyl)ρiρeridine To a solution of 1 -(3-R S-phenylbutyl)-4-piperidone (Method K) (500mg, 2.2 mmol) in MeOH (8ml) and acetic acid (2ml) was added propargylamine (0.18ml, 2.6 mmol). After 45mins, sodium cyanoborohydride (170mg, 2.7mmol) was added and the reaction mixture left to stir at ambient temperature. After 16h EtOAc was added and the reaction mixture was partitioned with dilute brine. The organic layer was separated, dried (MgSO4) and concentrated to give the title compound as an oil (330mg, 1.2mmol); MS: 271. Method D
4-Allylamino-l-N-(3,3-diphenylpropyl)piperidine
To a solution of l-(3,3-diphenylρropyl)-4-piperidone (Method L) (500mg, 2.2 mmol) in MeOH (8ml) and acetic acid (2ml) was added allylamine (0.19ml, 2.6 mmol). After 45mins, sodium cyanoborohydride (135mg, 2.2mmol) was added and the reaction mixture left to stir at ambient temperature. After 16h EtOAc was added and the reaction mixture was partitioned with dilute brine. The organic layer was separated, dried (MgSO4) and concentrated to give the title compound as an oil (170mg, 0.50mmol); MS: 335.
Method E 4-Allylamino- 1 -N-(3-R/S-phenylbutyl)piρeridine
To a solution of l-(3-R/S-phenylbutyl)-4-piperidone (Method K) (500mg, 2.2 mmol) in MeOH (8ml) and acetic acid (2ml) was added allylamine (0.19ml, 2.6 mmol). After
45mins, sodium cyanoborohydride (170mg, 2.7mmol) was added and the reaction mixture left to stir at ambient temperature. After 16h EtOAc was added and the reaction mixture was partitioned with dilute brine. The organic layer was separated, dried (MgSO4) and concentrated to give the title compound as an oil (180mg, 0.66mmol); MS: 273.
Method F
4-Piperidinyl-N-2-phenylethyl-2,4-difluorophenylurea.trifluoroacetic acid salt
To a solution of l-tert-butyoxycarbonylpiperidin-4-yl-N-2-phenylethyl-2,4- difluorophenylurea (Method O) (300mg, 0.65 mmol) in DCM (4ml) was added trifluoroacetic acid (1ml). After 2h the reaction mixture was concentrated to give the title compound as an oil (0.3 lg, 0.65mmol); MS: 360.
Method G
4- Amino- 1 -(3 ,3 -diphenylpropyl)piperidine . To a solution of 4-tert-butoxycarbonylamino- 1 -N-(3,3-diphenylpropyl)piperidine
(Method I) (lOg, 25 mmol) in DCM (100 ml) was added trifluoroacetic acid (20 ml) dropwise.
After 3h, toluene was added and the reaction mixture was concentrated to give the di- trifluoroacetic acid salt of the title compound as an oil (9.7 g, 19 mmol); MS: 295.
Method H 4-Amino-l-(3-R/S-phenylbutyl)piperidine.ditrifluoroacetic acid salt
To a solution of 4-tert-butoxycarbonylamino- l-(3-R/S-phenylbutyl)piperidine
(Method J) (13. lg, 39.5 mmol) in DCM (150 ml) was added trifluoroacetic acid (30 ml) dropwise. After 15h, toluene was added and the reaction mixture was concentrated to give the di-trifluoroacetic acid salt of the title compound as an oil (12.8 g, 27.8 mmol); MS: 233. Method I
4-tert-Butoxycarbonylamino- 1 -N-(3 ,3-diphenylpropyl)piperidine To a solution of 4-(Boc-amino) piperidine (lOg, 50mmol) in acetonitrile (200ml) was added 3,3-diphenylpropyl bromide (15.1g, 55mmol), tetrabutylam-monium iodide (2g, 5mmol) and potassium carbonate (15g, 1 OOmmol) and the mixture refluxed. After 5h the reaction mixture was cooled and poured into water. The solution was partitioned with EtOAc and the organic layer dried (MgSO4), concentrated and purified by column chromatography (toluene: EtOAc, 1 : 1 with 1 % triethylamine) to give the title compound as an oil (15.9g, 40mmol); MS: 395. . Method J 4-tgrt-Butoxycarbonylamino- 1 -(3-R/S-phenylbutyl)piperidine
To a stirred solution of 4-(Boc-amino) piperidine (45g, 0.225mol) in methanol (160ml) was added 3-R/S-phenylbutyraldehyde (36.5ml, 0.25mol) followed by acetic acid (15ml). After 1 hour, sodium triacetoxyborohydride (71.5g, 0.34mol) was added portionwise over 30 mins [Caution: effervescence and exotherm]. After 15h water (60 ml) was added and the total mixture was concentrated to remove the methanol. Water (250 ml) was added and the mixture was extracted with EtOAc (3 x 500 ml). The combined organics were washed with water, brine and dried (MgSO4) to give the title compound as a white solid that was further recrystallised from DCM/ EtOAc (54.1 g, 0.163 mol); m pt 220-221°C; ΝMR: 1.2 (m, 3H), 1.4 (s, 9H), 1.7 (m, 2H), 2.0 (m, 6H), 2.8 (m, 4H), 3.3 (m, 2H), 7.0 (br s, IH), 7.3 (m, 5H); MS: 333. Method K 1 -(3 -R/S-phenylbutyl)-4-piρeridone
A solution of l-(3-R/S-phenylbutyl)-4-piperidone ethylene ketal (Method M) (6.45 g, 23 mmol) in 6M hydrochloric acid (80ml) was heated to reflux. After 3h the reaction mixture was cooled and the pH was adjusted to pH 10 by the addition of IM ΝaOH. The mixture was extracted with DCM (3x30ml) and the combined organics were dried (MgSO4), concentrated and purified by flash column chromatography (DCM to 5% MeOH/DCM) to give the title compound as an oil (2.3 g, 10 mmol); ΝMR (CDC13): 1.2 (d, 3H), 1.6 (s, IH), 1.8 (q, 2H), 2.2- 2.5 (m, 5H), 2.7 (m, 3H), 2.8 (q, IH) and 7.1-7.4 (m, 5H); MS: 232. Method L
1 -(3 ,3 -Diphenylpropyl)-4-piperidone
The procedure described in Method K was repeated using l-(3,3-diphenylpropyl)-4- piperidone ethylene ketal (Method N) (5.3 g, 16 mmol) in place of l-(3-R/S-phenylbutyl)-4- piperidone ethylene ketal to give the title compound as an oil (4.6 g, 16 mmol); NMR
(CDC13): 2.3 (m, 2H), 2.4 (m, 6H), 2.7 (m, 4H), 4.05 (q, IH) and 7.1-7.4 (m, 10H).
Method M l-(3-R/S-Phenylbutyl)-4-piperidone ethylene ketal
To a solution of 4-piperidone ethylene ketal (lOg, 70mmol) in MeOH (100ml) was added acetic acid (5ml) and 3-R/S-phenylbutyraldehyde (11.4 ml, 77mmol) and the reaction mixture left to stir at ambient temperature. After lh sodium triacetoxyborohydride (21g,
99mmol) was added portionwise. After a further 3h water was added and the methanol was partially removed by evaporation; more water was added and the mixture extracted with
EtOAc (x3). The combined organics were washed with water, brine, dried (MgSO4) and concentrated to give the title compound as an oil (17.8g, 65mmol); MS: 276.
Method N l-(3,3-Diphenylpropyl)-4-piperidone ethylene ketal
To a solution of 4-piperidone ethylene ketal (5g, 35mmol) in acetonitrile (50ml) was added potassium carbonate (9.6g, 70mrnol) followed by 3,3-diphenylpropylbromide (9.6g, 35mmol) and tefrabutylammonium hydrogensulphate (lg). After 16h water was added and the acetonitrile was partially removed by evaporation; the mixture was then extracted with
EtOAc (x3). The combined organics were washed with water, brine, dried (MgSO4), concentrated and purified by flash column chromatography (DCM to 8% MeOH/DCM) to give the title compound as an oil (5.3g, 16mmol); MS: 338. Method O l-tert-Butyoxycarbonylpiperidin-4-yl-N-2-phenylethyl-2,4-difluorophenylurea
To a solution of 4-(2-phenylethylamino)-l -tert-butoxycarbonylpiperidine (Method P)
(0.61g, 2mmol) in DCM (30ml) was added 2,4-difluorophenylisocyanate (0.21ml, 2mmol).
After 3h water was added and the reaction mixture stirred for 20mins. The organic layer was then separated and the aqueous layer partitioned with DCM. The combined organic layers were washed with water, dried (MgSO- , concentrated and columned (20% EtOAc/iso-hexane to 40%) EtOAc/iso-hexane) to give the title compound as an oil (0.73g, 1.6mmol); MS:460. Method P
4-(2-Phenylethylamino)- 1 -tert-butoxycarbonylpiperidine
To a solution of l-tert-butoxycarbonylpiperid-4-one (lOg, 50mmol) and 2- phenethylamine.hydrochloride (7.9g, 50mmol) in MeOH (250ml) was added sodium cyanoborohydride (6.3g, lOOmmol). After 1.5h, water was added carefully and the MeOH was partially removed by evaporation. The mixture was extracted with DCM (x3); the organics were combined and washed with water, dried (MgSO4), concentrated and purified by column chromatography (DCM to 5% MeOH/DCM) to give the title compound as an oil (13.4g, 44mmol); NMR (CDC13): 1.5 (m, 9H), 1.9 (d, 2H), 2.2 (t, 4H), 2.8 (t, 2H), 2.9 (m, 2H), 3.0 (m, 2H), 3.85 (m, IH), 4.1 (m, 2H) and 7.2-7.4 ( , 5H). Method R 4-(Cyclopropylmethyl)amino- 1 -(3-R/S-phenylbutyl)piperidine
To a solution of l-(3-R/S-phenylbutyl)-4-piperidone (Method K) (500mg, 2.2 mmol) in MeOH (8ml) and acetic acid (2ml) was added cyclopropylmethylamine (0.2ml, 2.6 mmol). After 45mins, sodium cyanoborohydride (170mg, 2.7mmol) was added and the reaction mixture left to stir at ambient temperature. After 16h EtOAc was added and the reaction mixture was partitioned with dilute brine. The organic layer was separated, dried (MgSO- and concentrated to give the title compound as an oil (230mg, 1.2mmol); MS: 287. Method S 4-Fluorocinnamanic acid tert-butyl ester
To a suspension of 4-fluorocinnamanic acid (1.66g, lOmmol) in toluene (15mL) heated to 80°C, was added dimethylformamide di-tert-butylacetal (8.2g, 40 mmol) dropwise, and the reaction heated for a further 30 minutes. Upon cooling, the reaction was partitioned between toluene and water (15mL), and washed with NaHCO3 solution (2xl0mL), and brine (lOmL). The organic layer was dried, and concentrated. Purified on a Bond Elut column (eluent DCM) to afford the desired product as a colourless oil (1.25 g, 5.6mmol); NMR (CDC13): 1.57 (9H, s), 6.28 (lh, d), 7.07 (2H, t) and 7.50 (3H, m). Method T 3-Phenyl-3-(4-fluorophenyl)propionic acid tert-butyl ester To a -78°C solution of 4-fluorocinnamanic acid tert-butyl ester (Method S) (0.9g,
4mmol) in THF was added dropwise a solution of phenyllithium in hexanes (4 mL of 1.5M solution, 6 mmol). The reaction was stirred for lh and then quenched with water and extracted into EtOAc, dried and purified by Bond Elut chromatography (50:50 DCM/iso-hexane) to afford the title compound, as a colourless oil (500 mg, 1.8mmol); NMR (CDC13): 1.21 (9H, s), 2.87 (2H, d), 4.40 (IH, t), 6.90 (2H, t) and 7.15 (7H, m). Method U 3-Phenyl-3-(4-fluorophenyl)-propan-l-ol
To a THF (10 mL) solution of 3-phenyl-3-(4-fluorophenyl)-propionic acid, tert-butyl ester (Method T) (495mg, 1.65mmol) was added LiAlH4 in THF (2.5 mL of a 1.0M solution) and the reaction stirred at RT for 2h. The reaction mixture was quenched cautiously with 2M aqueous NaOH, and the precipitate removed. The solution was then extracted with EtOAc, washed with water (20 mL) dried, MgSO4, and evaporated to afford the title compound as a pale solid, (379 mg, 1.65mmol); NMR (CDC13): 2.23 (2H, m), 3.65 (2H, t), 4.06 (IH, t), 6.90 (2H, m) and 7.20 (7H, m). Method V 3-Phenyl-3-(4-fluorophenyl)- 1 -bromopropane To a solution of 3-phenyl-3-(4-fluorophenyl)-propan-l-ol (Method U) (379mg,
1.65mmol) in DCM (5 mL), was added carbon tetrabromide (564 mg, 1.7 mmol), and triphenyl phosphine (445 mg, 1.7 mmol). The reaction was stirred overnight, and filtered through a pad of silica, then evaporated. The title product was obtained as a pale white solid by Bond Elut chromatography, eluent iso-hexane, (415 mg, 86%); NMR (CDC13): 2.43 (2H, m), 3.20 (2H, t), 4.16 (IH, t), 6.90 (2H, m) and 7.20 (7H, m). Method W 4,4-Di-(4-fluorophenyl)- 1 -iodobutane
To a suspension of sodium iodide (1.5 g, 10 mmol) in acetone (100 mL) was added 4,4-di(4-fluorophenyl)-l-chlorobutane (2 g, 7 mmol), and refluxed for 5h. The acetone was evaporated and the product was partitioned between water and EtOAc. The organic phase was dried (MgSO4) and evaporated to give the title compound as a pale yellow oil, (3 g, 2:1 mixture of product to starting material); NMR (CDC13): 1.80 (2H, m), 2.20 (2H, m), 3.20 (1 1/3H, t, CH2I), 3.55 (2/3H, t, CH2C1), 3.90 (IH, t), 6.96 (4H, m) and 7.16 (4H, m). Method X 4,4-Di-(4-fluorophenyl)-but- 1 -ene
The crude 4,4-di-(4-fluorophenyl)iodobutane (Method W) (3 g) was added to potassium tert-butoxide (1.3 g, 12 mmol) in THF (30 mL), and stirred overnight. The product. was extracted into EtOAc and washed with water (100 mL). The organic phase was dried (MgSO4) and evaporated to afford a yellow oil. This was purified by chromatography (silica, z-ro-hexane) to afford the desired product as a colourless oil. (1.4 g, 82%); NMR: 2.80 (2H, t), 4.00 (IH, t), 4.98 (IH, dd) 5.05 (IH, dd), 5.70 (IH, ddt), 7.00 (4H, ) and 7.20 (4H, m). Method Y
3 ,3 -Di-(4-fluorophenyl)propanal
A DCM solution of 4,4-di-(4-fluorophenyl)-but-l-ene (Method X) (1.4 g, 5.7 mmol, in 20 mL) was cooled to -78°C and exposed to ozone until a pale blue colour persisted (about 20 min). The reaction was then purged with oxygen until the colour faded, and finally quenched with triphenylphosphine (1.49 g, 5.7 mmol). Upon warming to RT the reaction was washed with water, dried (MgSO4) and concentrated. The residue was passed through a plug of silica to afford the title product as a colourless oil, (1.18 g, 100%); NMR (CDC13): 3.15 (2H, d), 4.60 (IH, t), 7.00 (4H, m), 7.18 (4H, m), 9.75 (IH, s). Method Z l-(3,3-Di-[4-fluorophenyl]propyl)-4-([tert-butoxycarbonyl]amino)piperidine
To a solution of 3,3-di-(4-fluorophenyl)propanal (Method Y) (1.18 g, 5.7 mmol), in dichloroethane (14 mL) and 4-Bocaminopiperidine (1.2 g, 6 mmol) was added acetic acid (0.3 mL), 3 A molecular sieves (2 g), and sodium triacetoxyborohydride (1.27 g, 6 mmol), and the reaction mixture stirred for 5h. The mixture was poured onto water and extracted into EtOAc (30 L), dried and evaporated. The title product was obtained by purification by chromatography (silica, 5% MeOH/DCM) to give the product as a solid (1.7 g, 69%); MS: 431. Method AA
1 -(3 ,3 -Pi- [4-fluorophenyl]propyl)-4-(methylamino)piperidine
To a solution of l-(3,3-Di-[4-fluorophenyl]proρyl)-4-([tert-butoxycarbonyl]amino)piperidine (Method Z) (1.7 g, 3.9 mmol) in THF (50 mL), was added LiAlH4 solution (5 mL of a 1.OM solution in THF) dropwise (CARE gas evolution) and then the reaction was refluxed for 16h. The reaction mixture was then cooled to RT and cautiously quenched with 2M NaOH, filtered to remove precipitate and partitioned between water and EtOAc. The organic layer was dried over MgSO and evaporated. The crude product was purified by chromatography (silica, eluent 1:1, toluene:EtOAc with 0.5% isopropylamine) to afford the title compound as a yellow oil (500 mg, 37%); NMR: 2.2-1.0 (9H, m), 2.67 (IH, m), 3.4-3.2 (4H, m), 3.90-4.10 (2H, m), 4.35 (2H, m), 7.05 (4H, m) and 7.30 (4H, m); MS: 345. Method AB
4-E thylamino- 1 -N-(3 ,3 -diphenylpropyl)piperidine
To a solution of l-(3,3-diphenylpropyl)-4-piperidone (Method L) (2.2g, 7.5mmol) in DCM (30ml) was added ethylamine (8.5ml, 2M in THF, 17mmol), sodium triacetoxyborohydride (1.6g, 7.5mmol) and 4A Molecular Sieves (10 rods). The reaction mixture left to stir at ambient temperature. After 16h the mixture was filtered, washed with water, dried (Na^O^ and concentrated to give the title compound as an oil (1.4g, 4.35mmol); MS: 323. Method AC N-[l-Phenylmethyl-piρeridin-4-yl]-N-meτhyl-(4-fluorophenyl)acetamide
To a solution of 4-methylammo-l-N-(phenylmethyl)piperidinef (2.95g, 14.5mmol) in DMF (25ml) was added DIPEA (10ml), 4-fluorophenylacetic acid (2.67g, 17.3mmol) and HATU (6.0g, 16mmol). After 16h at RT water was added and the mixture was partitioned with EtOAc (x3). The organics were combined, washed with water and brine, dried (MgSO4) and concentrated to give the title compound as a brown oil (4.90g, 14.4mmol); MS: 341. f 4-Methylamino- l-N-(phenylmethyl)piperidine is described inJ. Med. Chem. 1999, 42, 4981-5001. Method AD 4-(N-(4-Fluorophenylacetamido)-N-methyl)ammopiperidine
To a solution of N-[l-phenylmethyl-piρeridin-4-yl]-N-methyl-(4- fluorophenyl)acetamide" (Method AC) (4.90g, 14.4mmol) in EtOH (50ml) was added 20% palladium hydroxide on carbon (lg) followed by ammonium formate (5.18g, 82mmol). The reaction mixture was then refluxed until the evolution of gas ceased at which point it was filtered through Celite® and concentrated to give the title compound as an oil (2.86g, 11.4mmol); MS: 251. Method AE 3-Phenylpent-4-enoic acid
Cinnamyl alcohol (5g, 37mmol), triethylorthoacetate (47ml) and propionic acid (0.17ml) were heated at 140°C under a distillation head and condenser. After lh the reaction mixture was cooled and concentrated to give a pale yellow oil. This oil was dissolved in EtOH (15ml) and water (15ml) and NaOH (3.73g, 93mmol) was added and the mixture stirred at 80°C. After 16h the mixture was heated to 100°C for 2h then allowed to cool. The reaction mixture was diluted with water (120ml) and extracted with diethyl ether (2x150ml). The aqueous layer was acidified with AcOH and then re-extracted with diethyl ether (3x150ml). The organics were combined and dried (MgSO4) and concentrated to give the desired product as a brown oil (5.52g, 3 lmmol); NMR: 2.65 (m, 2H), 3.75 (1, IH), 4.95 (s, IH), 5.05 (d, IH), 5.95 (m, IH), 7.2 (m, 5H), 12.1 (br s, IH); MS: 177. Method AF 3-Phenylpent-4-en- 1 -ol To a solution of 3-phenylpent-4-enoic acid (Method AE) (2.0g, 11 mmol) in THF
(20ml) at 0°C was added lithium aluminium hydride (12.5ml, IM solution in THF) dropwise over 15 mins and the reaction mixture was allowed to warm to RT. After 64h water (2.4ml) was added followed by 2N NaOH (2.4ml) then water (7.2ml). The resulting gelatinous precipitate was filtered, washed with THF and concentrated. The residue was dissolved in DCM and washed with saturated sodium hydrogen carbonate (2x150ml), dried (MgSO4) and concentrated to give the title compound as apale yellow oil (1.8g, 11. lmmol); NMR: 1.8 (m, 2H), 3.4 (m, 2H), 4.4 (t, IH), 5.0 (m, 2H), 5.9 (m, IH) and 7.2 (m, 5H). Method AG 5 -Bromo-3 -phenylpent- 1 -ene The procedure described in Method V was repeated except using 3 -phenylpent-4-en- 1 - ol (1.75g, 10.8mmol), triphenylphosphine (3.12g, 11.9mmol), carbon tetrabromide (3.94g, 11.9mmol) and DCM (35ml) to give the title compound as a colourless oil (2.02g, 9mmol); NMR: 2.2 (m, 2H), 3.4 (m, 3H), 5.1 (m, 2H), 5.95 (m, IH) and 7.2 ( , 5H).
Method AH
N-[l-(3-[4-Fluorophenyl]-3-oxopropyl)-4-piperidinyll-N-ethyl-4- methanesulfonylphenylacetamide hydrochlori.de
To a solution ofN-4-piperidinyl-N-ethyl-4-methanesulfonylphenylacetamide (1.3 g, 4.0 mmol) in DMF (25 mL) was added DIPEA (2 mL, 11.5 mmol) and 3-chloro-4'- fluoropropiophenone (770 mg, 4.0 mmol). The resulting mixture was stirred at room temperature overnight then evaporated. The residue was heated to reflux with 5% methanol in ethyl acetate giving a white solid which was isolated (1.6 g, 80%). ΝMR: 1.00 and 1.16 (t, 3H), 1.75 (t, 2H), 2.23 (q, 2H), 3.10 (t, 2H), 3.18 (s, 3H), 3.30 (m, 2H), 3.35 and 3.64 (q, 2H), 3.56 (m, 2H), 3.82 and 3.93 (s, 2H), 4.15 and 4.28 ( , IH), 7.40 (m, 2H), 7.50 (m, 2H), 7.83 (m, 2H), 8.07 (m, 2H); MS: 475. Method Al N-(4-Piperidinyl)-N-ethyl-4-methanesulfonylphenylacetamide
To a solution of N-(l-phenylmethyl-4-piperidinyl)-N-ethyl-4-methanesulfonylphenyl- acetamide (34g, 82mmol) in ethanol (600mL) was added ammonium formate (40g). The mixture was purged with argon and 30% Pd on carbon (4.2g) was added. The resulting mixture was stirred at reflux for 4 h, then allowed to cool and filtered through diatomaceous earth. The filtrate was evaporated to give a thick oil which solidified on standing to yield the title compound (24.9 g, 94%); ΝMR: 1.02 and 1.15 (t, 3H), 1.4 -1.6 (br m, 4H), 2.45 (m, 2H), 2.93 (br m, 2H), 3.18 (s, 3H), 3.20 and 3.32 (q, 2H), 3.72 and 4.18 (m, IH), 3.80 and 3.87 (s, 2H), 7.50 (m, 2H), 7.85 (m, 2H); MS: 325 (MH+). Method AJ N-(l-Phenylmethyl-4-piperidinyl)-N-ethyl-4-methanesulfonylphenylacetamide
To a solution of l-phenylmethyl-4-ethylaminopiperidine dihydrochloride (32. Og, 1 lOmmol) in DCM (500mL) was added Ν,Ν-diisopropylethylamine (60mL) with stirring to ensure complete dissolution. 4-Methanesulfonylphenylacetic acid (25. Og, 117mmol), 4- Dimethylaminopyridine (4-DMAP) (2.0g) and dicyclohexylcarbodiimide (DCCI) (25.0g, 121 mmol) were added and the resulting mixture was stirred at room temperature for 20 h. The precipitate was removed by filtration and the resulting solution was washed successively with 2N aqueous HCI, water and IN aqueous NaOH, dried (MgSO4) and evaporated. The residue was purified by silica gel chromatography (eluent 10% MeOH/ethyl acetate) to afford the title compound (35 g, 76%); NMR: 1.00 and 1.14 (t, 3H), 1.45 and 1.70 (m, 2H), 1.95 (br m, 2H), 2.80 (br m, 2H), 3.18 (s, 3H), 3.20 and 3.33 (q, 2H), 3.45 (s, 2H), 3.80 and 3.87 (s, 2H), 3.70 and 4.10 (m, IH), 7.2 - 7.3 (m, 5H), 7.48 (m, 2H), 7.82 (m, 2H); MS: 415 (MH+). Method AK 1 -Phenylmethyl-4-ethylaminopiperidine dihydrochloride
To a solution of l-phenylmethyl-4-piperidone (25.0 g, 132 mmol) in THF (250 mL) was added ethylamine hydrochloride (12.0 g, 147 mmol) and methanol (50 mL) and the resulting mixture stirred at room temperature for 10 min. Sodium triacetoxyborohydride (40 g, 189 mmol) was added portionwise and the resulting mixture stirred at room temperature for 1 h. 2M Sodium hydroxide solution (250 mL) was added and the resulting mixture extracted with diethyl ether. The organic extracts were dried (K2CO3) and evaporated to give 1- phenylmethyl-4-ethylaminopiperidine as an oil. This was dissolved in ethanol (500 mL) and concentrated hydrochloric acid (20 mL) was added. The resulting crystals were collected, washed with diethyl ether and dried giving the title compound as a solid (38 g); NMR:
(CDClj): 1.10 (t, 3H), 1.40 (m, 2H), 1.83 (m. 2H), 2.02 (m, 2H), 2.65 (q, 2H), 2.85 (m, 2H),
3.50 (s, 2H), 3.75 (m, IH), 7.2 - 7.4 (m, 5H); MS: 219 (MH+).
Method AL
N- [ 1 -(3 -Phenyl-3 -chloropropyl)-4-piperidinyl1 -N-methyl-4-fluorophenylacetamide
To a cooled (5°C) solution of N-[l -(3 -phenyl-3 -hydroxypropyl)-4-piperidinyl]-N- methyl-4-fluorophenylacetamide (112 mg, 0.29 mmol) in DCM (5 mL) was added Ν,Ν- diisopropylethylamine (0.10 mL, 0.58 mmol) then methanesulfonyl chloride (0.03 mL, 0.35 mmol). The resulting mixture was stirred at ambient temperature for 18 h, then was concentrated. The residue was purified by Bond Elut chromatography (eluent DCM, followed by 5% MeOH/DCM) to afford the title compound as an oil (120mg) which was characterised by LC-MS; MS: 403, 405. Method AM N- [ 1 -(3 -Phenyl-3 -hydroxypropyl)-4-piperidinyl] -N-methyl-4-fluorophenylacetamide
To a solution of N-[l-(3-phenyl-3-oxopropyl)-4-piperidinyl]-N-methyl-4- fluorophenylacetamide (300 mg, 0.78 mmol) in methanol (30 mL) was added sodium borohydride (120 mg) and the resulting mixture was stirred at room temperature for 2 h.
Water (5 mL) was added and the mixture was concentrated. The residue was extracted with DCM and the organic extract was washed with water and brine, dried and concentrated to give the title compound (230 mg, 76%); NMR: 1.4 (m, 2H), 1.7 (m, 4H), 1.9 (m, 2H), 2.7 and 2.8 (s, 3H), 2.9 (m, 2H), 3.65 and 3.75 (s, 2H), 4.2 (m, IH), 4.6 (m, IH), 5.4 (br s, IH), 7.1 (m, 2H), 7.2 (m, 3H), 7.3 (m, 4H); MS: 385. Method AN N-[l-(3-Phenyl-3-oxoproρyl)-4-piperidinyl]-N-methyl-4-fluorophenylacetamide
To a solution of N-(4-piperidinyl)-N-methyl-4-fluorophenylacetamide (250 mg, 1.0 mmol) in DMF (10 mL) was added 3-chloropropiophenone (168 mg, 1.0 mmol) and DIPEA (0.35 mL, 2.0 mmol). The resulting mixture was stirred at room temperature for 3 h. Water and DCM were added and the phases separated. The organic phase was washed with brine, dried and concentrated. The residue was purified by silica column chromatography (eluent 10% MeOH in DCM) yielding the title compound (305 mg); ΝMR: 1.3 (m, 2H), 1.6 (m, 2H), 2.0 (m, 2H), 2.6 (s, 3H), 2.7 (m, 2H), 2.9 (m, 2H), 3.1 (t, 2H), 3.7 (m, 2H), 4.2 (m, IH), 7.1 (m, 2H), 7.2 (m, 2H), 7.4 (dd, 2H), 7.6 (t, IH), 7.9 (d, 2H); MS: 383. Method AO N-(2-Bromoethyl)diphenylamine
To a cooled (5°C) solution of N,N-diphenylbromoacetamide (1.4 g, 5.0 mmol) in THF (20 mL) was added borane methyl sulfide complex (26 mL, 1.0M) gradually. The reaction mixture was stirred at room temperature for 4 h. 1 % Acetic acid in methanol (30 mL) was added and the resulting mixture was stirred for 20 h. The solvent was removed by evaporation and the residue was partitioned between ethyl acetate and water. The organic phase was dried and concentrated to give the title compound (1.0 g); ΝMR (CDC13): 3.52 (t, 2H), 4.10 (t, 2H), 7.00 ( , 4H), 7.23 (m, 6H). Method AP
N,N-Diphenylbromoacetamide
To a cooled (5°C) solution of diphenylamine (2.0 g, 12 mmol) in DMF (15 mL) was added sodium hydride (520 mg, 60% dispersion) followed by bromoacetyl bromide (3.58 g) and the resulting mixture was stirred for 2 h. Water was added gradually, then the mixture was extracted three times with ethyl acetate. The combined organic extracts were washed three times with brine, dried (MgSO4) and evaporated to yield the title compound (3.4 g, 99%); ΝMR (CDC13): 3.83 (S, 2H), 7.35 (m, 10H). Method AQ N-(4-Piperidinyl)-N-allyl-4-methanesulfonylphenylacetamide
To a solution of N-(l-phenylmethyl-4-piperidinyl)-N-allyl-4- methanesulfonylphenylacetamide (4.40 g, 10.3 mmol) in DCM (30 mL) under an argon atmosphere and the mixture cooled in an ice- water bath. 1 -Chloroethyl chloroformate (1.34 mL, 12.4 mmol) was added and the resulting mixture was stirred for 3 h while warming to room temperature. The mixture was evaporated and the residue dissolved in methanol (30 mL). The resulting mixture was refluxed for 1 h, allowed to cool and concentrated. The crude product was purified by silica column chromatography (eluent 5%EtOH/DCM then 15%EtOH/2% isopropylamine/DCM) to give the title compound (1.30 g); ΝMR: 1.50 (m, 4H), 2.50 (m, 2H), 2.95 (m, 2H), 3.20 (s, 3H), 3.74 and 3.91 (s, IH), 3.80 and 3.95 (d, IH), 4.29 (m, IH), 5.00 and 5.05 (d, IH), 5.20 (m, IH), 5.73 and 5.89 (dddd, IH), 7.44 and 7.49 (d, 2H), 7.85 (m, 2H). Method AR
N-(l-Phenylmethyl-4-piperidinyl)-N-allyl-4-methanesulfonylphenylacetamide
This was prepared by reacting l-phenylmethyl-4-allylamine with 4- methanesulfonylphenylacetamide according to the procedure used for Method AJ; ΝMR (d6- DMSO, 373K): 1.65 (m, 2H), 1.88 (m, 2H), 2.39 (m, 2H), 3.05 (m, 2H), 3.09 (s, 3H), 3.75 (m, 4H), 3.93 (s, 2H), 4.08 (m, IH), 5.15 (m, 2H), 5.82 (dddd, IH), 7.30 (m, 5H), 7.45 (d, 2H), 7.80 (d, 2H). Method AS
1 -Phenylmethyl-4-allylamine
This was prepared by reacting l-phenylmethyl-4-piperidone with allylamine according to the procedure used for Method AK; ΝMR (CDC13): 1.4 (m, 2H), 1.5 (m, 2H), 1.9 (m, 2H), 2.0 (dd, 2H), 2.5 (m, IH), 2.8 (m, 2H), 3.3 (d, 2H), 3.5 (s, 3H), 5.1 (d, IH), 5.2 (d, IH), 5.9 (dddd, IH), 7.3 (m, 5H); MS: 231 (MH+). Method AT N-4-Piperidinyl-N-ethyl-4-fluorophenylacetamide
This was prepared by reacting N-(l-pheny lmethyl-4-piperidinyl)-N-ethyl-4- fluorophenylacetamide according to the procedure used for Method Al; ΝMR: (formic acid salt): 0.97 and 1.10 (t, 3H), 1.46 and 1.62 (m, 2H), 1.8 - 2.0 ( , 2H), 2.78 (m, 2H), 3.1 - 3.3 ( , 4H), 3.65 and 3.74 (s, 2H), 3.97 and 4.22 (m, IH), 7.08 ( , 2H), 7.25 (m, 2H), 8.42 (s, IH); MS: 265. Method AU
3-Phenyl-3-Boc-aminopropanal
A solution of 3-phenyl-2-Boc-aminopropanol (700 mg, 2.78 mmol) in DCM (8 mL) was added to a stirred solution of Dess-Martin periodinane (1.30 g, 3.06 mmol) in DCM (5 mL) at room temperature followed by pyridine (0.3 mL). After stirring for 6 h at room temperature the mixture was partitioned between diethyl ether and saturated aqueous sodium bicarbonate solution containing sodium thiosulfate. The organic phase was washed with water and brine, dried and concentrated giving the title compound as a solid (790 mg); NMR: 1.4 (s, 9H), 2.8 (m, 2H),.5.1 (m, IH), 7.3 (m, 5H), 8.6 (m, IH), 9.6 (t, IH). Method AV
3-Phenyl-2-Boc-aminopropanol
To a solution of 3-phenyl-3-Bocaminopropanoic acid (1.0 g, 3.78 mmol) in THF (10 mL) was added borane-THF complex (7.5 mL, 1.5M, 11.3 mmol) at 0°C. The resulting mixture was stirred with warming to room temperature for 5 h. 10% Acetic acid in methanol (20 mL) was added dropwise, the resulting mixture was concentrated and the residue partitioned between DCM and IM aqueous HCI. The organic phase was washed with water and brine, dried (MgSO4) and concentrated. The residue was purified by Bond Elut chromatography (eluent 5% MeOH/DCM) to afford the title compound (900 mg). Method AW
3-Phenyl-3-Boc-aminopropanoic acid
To a solution of DL-3-amino-3-phenylpropanoic acid (5 g, 30.2 mmol) in 2M aqueous sodium hydroxide (70 mL) was added a solution of di-tert-butyldicarbonate (8.56 g, 39.2 mmol) in THF (60 mL) and the resulting mixture stirred at room temperature for 48 h. Water
(50 mL) was added and the mixture washed twice with ethyl acetate (50 mL). The aqueous phase was acidified to pH 3 with concentrated aqueous HCI, and the resulting mixture was extracted twice with ethyl acetate (60 mL). The combined organic extracts were dried (MgSO4) and concentrated to give the title compound as a white solid (4.8 g); NMR: 1.4 (s,
9H), 2.7 (m, 2H), 4.8 ( , IH), 7.3 (m, 5H), 7.5 (br d, IH), 12.1 (br s, IH); MS: 266.
Method AX
4-Cyclopropylamino-l-(3,3-diphenylpropyl)piperidine
This was prepared using a method similar to that used for 4-ethylamino-l -(3, 3- diphenylpropyl)piperidine (Method AB). NMR: 0.0 (m, 2H), 0.2 (m, 2H), 1.1 (m, 2H), 1.55
(m, 2H), 1.7 (m, 2H), 1.9 (m, 5H), 2.5 (m, 2H), 3.7 (m, IH), 6.9 (m, 2H), 7.1 (m, 8H); MS:
335.
Method AY
4-(2 -Hydroxy ethylamino)- 1 -(3,3-diphenylpropyl)piperidine This was prepared using a method similar to that used for 4-ethylamino-l -(3,3- diphenylpropyl)piperidine. NMR: 1.2 (m, 2H), 1.7 (m, 2H), 1.9 (t, 2H), 2.1 (m, 4H), 2.3 (m,
IH), 2.7 (m, 2H), 3.1 (s, 3H), 3.4 (m, IH), 3.95 (m, IH), 7.1 (m, 2H), 7.3 (m, 8H); MS: 339.
Method AZ
4-(2-Fluoroethylamino)-l-(3,3-diphenylpropyl)piperidine This was prepared using a method similar to that used for 4-ethylamino-l -(3,3- diphenylpropyl)piperidine; MS: 341. Method BA
4-Chlorosulfonylphenylacetic acid.
Chlorosulfonic acid (10ml, 148 mmol) was heated to 40°C and phenyl acetic acid (5g, 36.7 mmol) was added slowly. Stirred for two hours then cooled and carefully poured onto ice (50g). The filtrate was cooled by filtration and dried under vacuum to afford the title compound as a pale cream solid. (7.9g, 92%); NMR (CDC13), 3.80 (2H, s), 7.68 (2H, d), 8.00 (2H, d); MS: ES- 233, ES+ 189. Method BB 4-Fluorosulfonylphenylacetic acid.
18-Crown-6 (63mg, lmol%) was added to a solution of 4-chlorosulfonylphenylacetic acid (5g, 24 mmol) and KF (2.78g, 48 mmol) in MeCN (5mL) and stirred for 4 h. The product was then drowned out by the addition of water (lOOmL) and collected by filtration to afford desired product (4.78g, 97%); NMR (CDC13): 3.80 (2H, s), 7.68 (2H, d), 8.00 (2H, d); MS: 187. Method BC N-[l-(3,3-Diphenylpropyl)-4-piperidinyl]-N-methyl-4-fluorosulfonylphenylacetamide
To a solution of HATU (836mg, 2.2mmol), 4-fluorosulfonylphenylacetic acid (409mg, 2.2 mmol), l-(3,3-diphenylpropyl)-4-methylaminopiperidine (618mg, 2 mmol) in DMF (10 mL) was added DIPEA (0.4mL) and stirred over night. Poured onto water and extracted into ethyl acetate (50 mL). Washed (brine lOOmL) and dried over MgSO4, and evaporated to afford a pale yellow solid. Trituration with ethyl acetate/hexane (50:50) afforded the title product as a pale yellow solid (577 mg, 57%); ΝMR: 1.80 (2H, m), 2.00 (2H, m), 2.40 (2H, m), 2.80-3.20 (6H, m), 3.27 (3H, s), 3.45 (2H, m), 3.92 (IH, m), 4.46 (IH, m), 7.20 (2H, m), 7.27 (8H, m), 7.60 (2H, t), 8.04 (2H, d); MS: 509. Method BD
N- [ 1 -(3 ,3 -diphenylρropyl)-4-piperidinyl] - N-methyl-4-methoxy carbonylphenylacetamide
Solid HATU (2.55 g; 6.7 mmol) followed by DIPEA (1.22 ml; 6.7 mmol) was added at room temperature to a solution of 4-methoxycarbonylphenylacetic acid (1.3 g; 6.7 mmol) in DMF (10 ml). After 5 minutes, 4-methylamino-l-(3,3-diphenylpropyl)piperidine (2.1 g; 6.7 mmol) was added and stirring continued overnight at ambient temp. The mixture was then partitioned between water (10 ml) and ethyl acetate (10 ml). The organic layer was separated, washed with water (1 ml) and dried over Νa2SO4 and evaporated to give an oil. Purification was by Bond Elut, eluting with a stepped gradient from DCM to 5% methanol in DCM yielding the title compound (2.47 g, 77%); MS: 485 (MH+). Method BE 4-tert-Butoxycarbonylamino- 1 -(3-R-phenyl- 1 -butanoic amide)piperidine
To a solution of 4-Boc-amino piperidine (2.46g, 12.3 mmol) in DMF (30 L) was added HATU (4.67g, 12.3 mmol) and 3-R-phenyl- 1 -butanoic acid(2g, 12.2 mmol) and DIPEA (2.12 mL). Stirred over night then poured into water and extracted into ethyl acetate. The organic extracts were dried over MgSO4 and evaporated to afford the title compound as a white solid, (4.03 g, 94%); NMR: 1.20 (6H, m), 1.38 (9H, s), 1.65 (2H, m), 2.60 (2H, m), 3.00 (IH, ), 3.15 (IH, q), 3.40 (IH, ), 3.80 (IH, d, broad), 4.20 (IH, m), 6.80 (IH, m), 7.18 (IH, m), 7.24 (4H, m) MS: 347, 291 (- BOC). Method BF
4-Amino-l -(3 -R-phenyl-1 -butanoic amide)piperidine hydrochloride
To a solution of acetyl chloride (5mL) in methanol (20mL) was 4-Boc-amino-l -(3-R- phenyl- 1 -butanoic amide)piperidine (lg, 3mmol) and stirred for one hour. The solvents were then evaporated to afford the title compound as a white solid. (929mg, 100% for HCI salt); NMR: 1.20 (3H, d), 1.35 (2H, m), 1. 41 (IH, m), 1.89 (2H, m), 2.80-3.20 (5H, m), 3.90 (IH, d), 4.30 (IH, d), 7.10 (IH, m), 7.20 (4H, ); MS: 247. Method BG
4- Amino- 1 -(3-R-phenylbutyl)piperidine
To a solution of 4-amino-l -(3 -R-phenyl-1 -butanoic amide)piperidine(lg, 3 mmol) in THF (20mL) was added a solution of LiAlH4 in THF (10 mL of 1.0M solution) and the mixture was refluxed for 5 hours. The mixture was cooled, quenched with aqueous sodium hydroxide, filtered and the filtrate partitioned between water and ethyl acetate. The combined organic phase was dried, MgSO4, and evaporated to afford the title compound as a white solid. (610 mg, 87 %); NMR: 1.20 (4H, m), 1.60 (4H, m), 1.89 (2H, m), 2.10 (2H, m), 2.43 (IH, m), 2.70 (4H, m), 7.10 (3H, m), 7.20 (2H, m); MS: 233. Method BH
4-tgrt-Butoxycarbonylamino- 1 -(3-S-phenyl- 1 -butanoic amide)piperidine
To a solution of 4-Boc-amino piperidine (2.46g, 12.3 mmol) in DMF (30 mL) was added HATU (4.67 g, 12.3 mmol) and 3 -S-phenyl-1 -butanoic acid (2g, 12.2 mmol) and DIPEA (2.12 mL). Stirred over night then poured into water and extracted into ethyl acetate. Dried over MgSO4 and evaporated to afford the title compound as a white solid, (4.17g, 99%); NMR: 1.20 (6H, m), 1.38 (9H, s), 1.65 (2H, m), 2.60 (2H, m), 3.00 (IH, m), 3.15 (IH, q), 3.40 (IH, m), 3.80 (IH, d, broad), 4.20 (IH, m), 6.80 (IH, m), 7.18 (IH, m), 7.24 (4H, m); MS: 347, 291 (- BOC). Method BI
4- Amino- 1 -(3 -S-phenyl-1 -butanoic amide)piperidine hydrochloride
To a solution of acetyl chloride (5mL) in methanol (20mL) was added 4-Boc-amino-l- (3-S-phenyl- 1 -butanoic amide)piρeridine( 1 g, 3mmol) and stirred for one hour. The solvents were then evaporated to afford the title compound as a white solid. (930mg, 100% for HCI salt); NMR: 1.20 (3H, d), 1.35 (2H, m), 1. 41 (IH, m), 1.89 (2H, m), 2.80-3.20 (5H, m), 3.90 (IH, d), 4.30 (IH, d), 7.10 (IH, m), 7.20 (4H, m); MS: 247. Method BJ
4- Amino- 1 -(3-S-phenylbutyl)piperidine
To a solution of 4-amino-l-(3-S-phenyl-l -butanoic amide)piperidine(lg, 3mmol) in THF (20mL) was added a solution of LiAlH4 in THF (10 mL of 1.0M soln) and the mixture was refluxed for 5 hours. The mixture was cooled, quenched with aqueous sodium hydroxide, filtered and the filtrate partitioned between water and ethyl acetate. The combined organic phase was dried, MgSO4, and evaporated to afford the title compound as a white solid. (680 mg, 97 %); NMR: 1.20 (4H, m), 1.60 (4H, m), 1.89 (2H, m), 2.10 (2H, m), 2.43 (IH, m), 2.70 (4H, m), 7.10 (3H, m), 7.20 (2H, m); MS: 233. Method BK N,-Phenylmethyl-N-(4-piperidinyl)-N-allylurea hydrochloride
Acetyl chloride (5.5 mL) was added to methanol (20 mL) at 0°C and the mixture stirred for 10 minutes before addition of a solution of N'-phenylmethyl-N-(l-tert- butyloxycarbonyl-4-piperidinyl)-N-allylurea (1.54 g, 4.17 mmol) in methanol (1 mL). The resulting mixture was stirred at 0°C for 1 h and at room temperature for 1 h. Evaporation afforded the title compound as a solid (0.96 g); ΝMR: 1.60 (br d, 2H), 1.93 (m, 2H), 2.80 (m, 2H), 3.10 (m, 2H), 3.79 (d, 2H), 4.21 (m, 3H), 5.10 (d, IH), 5.18 (dd, IH), 5.80 (ddt, IH), 7.20 (m, 5H), 9.21 (br s, 2H); MS: 274. Method BL
N-Phenylmethyl-N-(l-tert-butoxycarbonyl-4-piperidinyl)-N-allylurea
To a stirred solution of 1 -tert-butoxycarbonyl-4-allylaminopiperidine (1.0 g, 4.17 mmol) in DCM (20 mL) was added benzylisocyanate (0.52 mL, 4.2 mmol) and the resulting mixture was stirred at room temperature for 20 h. Water was added and the mixture evaporated to yield the title compound (1.54 g, 99%); ΝMR 1.39 (s, 9H), 1.50 (m, 4H), 2.70 (m, 2H), 3.79 (d, 2H), 4.0 (m, 3H), 4.21 (d, 2H), 5.10 (d, IH), 5.18 (dd, IH), 5.90 (ddt, IH), 6.62 (t, IH), 7.20 (m, 5H); MS: 274 (MH+- BOC). Method BM l-tert-Butoxycarbonyl-4-allylaminopiperidine
To a solution of 1 -tert-butoxycarbonyl-4-piperidone (10.0 g, 50 mmol) in 1,2- dichloroethane (140 mL) was added allylamine (3.4 g, 60 mmol), acetic acid (3.0 mL) and 3A molecular sieves (20 g). The resulting mixture was stirred at room temperature for 45 min. Sodium triacetoxyborohydride (16.2 g, 76 mmol) was added and stirring was continued for a further 4 h. The reaction was quenched with water and extracted twice with ethyl acetate. The organic extracts were washed with sodium bicarbonate solution, combined, dried (MgSO4) and concentrated to afford the title compound as an oil (11.5 g, 96%); NMR (CDC13): 1.21 (m, 2H), 1.40 (s, 9H), 1.60 (br s, IH), 1.81 (d, 2H), 2.63 (m, IH), 2.80 (t, 2H), 3.29 (t, 2H), 4.05 (d, 2H), 5.10 (d, IH), 5.18 (dd, IH), 5.90 (ddt, IH). Method BN
N-(l-Phenylmethyl-4-piperidinyl-N-ethyl-4-fluorophenylacetamide
This was prepared by reacting l-phenylmethyl-4-ethylaminopiperidine dihydrochloride with 4-fluorophenylacetic acid according to the procedure used for Method
AJ; ΝMR (CDC13): 1.13 and 1.19 (t, 3H), 1.35 and 1.85 (m, 2H), 1.74 and 2.08 (m, 2H), 2.90
(br m, 2H), 3.30 ( , 2H), 3.46 (s, 2H), 3.66 (s, 2H), 3.55 and 4.42 (m, IH), 7.00 (m, 2H), 7.2 -
7.3 (m, 7H); MS: 355.
Method BO N-[l-(3-phenyl]-3-oxopropyl)-4-piperidinyl1-N-ethyl-4-methanesulfonylphenylacetamide hydrochloride
To a solution of N-(4-piperidinyl)-N-ethyl-4-methanesulfonylphenylacetamide (Method Al) (14.8g, 45.8mmol) and DIPEA (24mL, 137mmol) in DMF (250mL) was added 3-chloropropiophenone (7.3g, 43.5mmol). The resulting mixture was stirred at room temperature for 20h. The mixture was evaporated and the residue triturated with 5%MeOH/EtOAc to give a solid which was collected by filtration and washed with EtOAc affording the title compound (16.9g, 75%); ΝMR (DMSO at 373 ): 1.14 (t, 3H), 1.77 (m, 2H), 2.34 (m, 2H), 3.11 (m, 2H), 3.15 (s, 3H), 3.45-3.60 (m, 6H), 3.65 (t, 2H), 3.93 (s, 2H), 4.25 (br m, IH), 7.53 (m, 4H), 7.65 (m, IH), 7.84 (d, 2H) and 7.98 (d, 2H); MS: 457. Method BP
3-(3-Trifluoromeτhylphenyl)butyraldehyde Step l: (E)-Ethyl 3-(3-trifluoromethylρhenyl)-2-butenoate
To a solution of triethyl phophonoacetate (1.98ml, lOmmol) in THF at 0°C was added lithium bis(trimethylsilyl)amide (12ml IM in THF, 12mmol) and the resulting mixture stirred. for lOmin. 3'-Trifluoromethylacetophenone (1.52ml, lOmmol) was added and the resulting mixture was stirred whilst allowing to warm to room temperature over lh. The mixture was evaporated and the residue partitioned between water and ethyl acetate, the organic phase was washed with brine, dried (MgSO4) and evaporated. The residue was purified by Bond Elut chromatography (eluent isohexane then 1 : 1 ethyl acetate/isohexane) affording the sub-titled compound (1.4g); NMR (CDC13): 1.3 (t, 3H), 2.6 (s, 3H), 4.2 (q, 2H), 6.15 (s, IH), 7.5 (m, lH), 7.6 (m, 2H), 7.7 (s, lH). Step 2: Ethyl 3-(3-trifluoromethylphenyl)butanoate
To a solution of (E)-ethyl 3-(3-trifluoromethylphenyl)-2-butenoate (Step 1) (1.4g) in ethyl acetate (50ml) was added 10% Pd/C (140mg) and the resulting mixture was stirred under an atmosphere of hydrogen for 18h. The mixture was filtered through Celite® and the filtrate evaporated to give the sub-titled compound (1.33g); NMR (CDC13): 1.2 (t, 3H), 1.35 (d, 3H), 2.6 (m, 2H), 3.4 (m, IH), 4.1 (q, 2H), 7.4 (m, 4H). Step 3: 3 -(3 -Trifluoromethylphenyl)butanol To a solution of ethyl 3-(3-trifluoromethylphenyl)butanoate (Step 2) (1.35g, 5.2mmol) in THF (15ml) at 0°C was added lithium aluminium hydride (5.2ml, IM in THF, 5.2mmol) and the resulting mixture was stirred for 5min. Ethyl acetate (10ml) was added followed by water (0.2ml) then 6M NaOH solution (0.2ml) then water (2ml) and the resulting mixture stirred at room temperature for 5min. before filtration through Celite®. The filtrate was dried (MgSO4) and evaporated giving the sub-titled compound (1.1 g); NMR (CDC13): 1.3 (d, 3H), 1.9 (m, 2H), 3.0 (m, IH), 3.6 (m, 2H), 7.4 (m, 4H). Step 4: 3 -(3 -Trifluoromethylphenyl)butyraldehyde
To a stirred solution of 3-(3-trifluoromethylphenyl)butanol (Step 3) (l.lg, 5.05mmol) in DCM (10ml) was added Dess-Martin periodinane (2.36g, 5.56mmol) and the resulting mixture stirred at room temperature for lOmin. The mixture was washed three times with 2M NaOH solution (20ml), then with brine (20ml), dried (MgSO4) and evaporated giving the title compound (lg, 92%); NMR (CDC13): 1.34 (d, 3H), 2.75 (m, 2H), 3.43 (m, IH), 7.46 (m, 4H), 9.73 (s, IH).
The same sequence of reactions was used to prepare 3-(3-chlorophenyl)butyraldehyde and 3-(3,4-dichlorophenyl)butyraldehyde except that platinum (IN) oxide was used as catalyst in the reduction of (E)-ethyl 3-(3-chlorophenyl)-2-butenoate and (E)-ethyl 3-(3,4- dichlorophenyl)-2-butenoate to ethyl 3-(3-chlorophenyl)butanoate and ethyl 3-(3,4- dichlorophenyl)butanoate respectively.
Method BQ 3-Amino-l-(3,3-diphenylproρyl)pyrrolidine di-(trifluoroacetic acid) salt Step 1 : 3-Boc-amino-l -(3,3-diphenylpropyl)pyrrolidine
To a mixture of 3-boc-aminopyrrolidine (lg, 5.4mmol) and 3,3- diphenylpropionaldehyde (l.lg, 5.4mmol) in DCM (20ml) and MeOH (5ml) was added acetic acid (0.1ml) and the resulting mixture stirred at room temperature for lh. Sodium triacetoxyborohydride (5.4mmol) was added and the mixture stirred for 18h. The reaction mixture was washed twice with water (10ml), dried and evaporated giving the sub-titled compound (2.1g); MS: 381. Step 2: 3-Amino-l-(3,3-diphenylpropyl)pyrrolidine di-(trifluoroacetic acid) salt
3-Boc-amino-l-(3,3-diphenylpropyl)pyrrolidine (Step 1) (2.1g) was dissolved in trifluoroacetic acid ( 10ml) and the resulting mixture was stirred at room temperature for 2h then evaporated giving the title compound (2.3g).
Method BR
3-(4-Chlorophenyl)-3-(4-pyridyl)propionaldehyde Step 1 : 3-(4-Chloroρhenyl)-3-(4-pyridyl)prop-l-ene
To a solution of 4-(4-chlorobenzyl)pyridine (lg, 4.9mmol) in THF was added n-butyl lithium (3.4ml of 1.6M solution, 5.4mmol) dropwise at room temperature. After stirring for 15min. the mixture was cooled to -78°C and allyl bromide (0.65g, 5.4mmol) was added dropwise. The reaction mixture was stirred while warming to room temperature over 18h. The mixture was purified by Bond Elut chromatography (eluent isohexane then diethyl ether) giving the sub-titled compound as an oil (0.54g); NMR (CDC13): 2.8 (t, 2H), 4.0 (t, IH), 5.0 (m, 2H), 5.7 (m, IH), 7.1 (m, 4H), 7.3 (m, 2H) and 8.5 (m, 2H); MS: 244. Step 2: 3-(4-Chlorophenyl)-3-(4-pyridyl)propionaldehyde
3-(4-Chlorophenyl)-3-(4-pyridyl)prop-l-ene (Step 1) (0.54g, 2.2mmol) was dissolved in MeOH (30ml) and the solution cooled to -78°C. Ozone was bubbled through until a blue colour persisted (20min.). The mixture was purged with oxygen and dimethyl sulphide (0.33ml) was added. The mixture was stirred for lh while warming to room temperature, then evaporated and the crude product used directly in the next reaction.
The same sequence of two reactions was used to prepare 3-(4-chlorophenyl)-3-(2- pyridyl)propionaldehyde.
Method BS
3 -( 1 ,3 -B enzodioxol-5-yl)-3 -phenylpropionaldehy de
Step 1: (E)-tert-Butyl 3-(l,3-benzodioxol-5-yl)propenonate A solution of 3,4-methylenedioxycinnamic acid (0.77g, 4mmol) in toluene (10ml) was heated with stirring to 80°C and N,N-dimethylformamide di-tert-butyl acetal (3.83ml, 16mmol) was added dropwise. The resulting mixture was stirred at 80°C for 2h then cooled to room temperature. The mixture was washed with water and brine, dried and evaporated. The residue was purified by Bond Εlut chromatography (eluent iso-hexane then DCM) giving the sub-titled compound as a solid (0.48g).
Step 2: tert-Butyl 3-(l,3-benzodioxol-5-yl)-3-phenylpropionate
To a -78°C solution of (E)-tert-butyl 3-(l,3-benzodioxol-5-yl)propenonate (Step 1) (2.4mmol) in THF (5ml) was added phenyl lithium (2ml of 1.8M solution, 3.6mmol) dropwise and the resulting mixture stirred at -78°C for 2h. Water (5ml) was added and the mixture allowed to warm to room temperature over 18h. The mixture was extracted with ethyl acetate, the organic phase was concentrated and the residue purified by Bond Εlut chromatography (eluent iso-hexane then DCM) giving the sub-titled compound as an oil (0.51g). Step 3: 3-( 1 ,3-Benzodioxol-5-yl)-3-phenylpropionaldehyde To a -78°C solution of tert-butyl 3-(l ,3-benzodioxol-5-yl)-3-phenylpropionate (Step
2) (1.36mmol) in DCM (5ml) was added diisobutylaluminium hydride (3ml IM solution, 3mmol) dropwise and the resulting mixture stirred at -78°C for 90min. MeOH (3ml) was added slowly and the mixture warmed to room temperature. Citric acid solution (10% aqueous, 5ml) was added, the mixture stirred for lOmin. then filtered. The filtrate was dried and evaporated yielding the title compound which was used immediately in the next reaction. The same sequence of three reactions was used to prepare 3-(4-chlorophenyl)-3- phenylpropionaldehyde, 3 -(3 ,4-dichlorophenyl)-3 -phenylpropionaldehyde, 3 -(4- methoxyphenyl)-3-ρhenylpropionaldehyde, 3-(3-chlorophenyl)-3-phenylpropionaldehyde, 3- (4-methylphenyl)-3-phenylpropionaldehyde and 3-(4-trifluoromethylphenyl)-3- phenylpropionaldehyde.
EXAMPLE 34 The ability of compounds to inhibit the binding of RANTES was assessed by an in vitro radioligand binding assay. Membranes were prepared from Chinese hamster ovary cells which expressed the recombinant human CCR5 receptor. These membranes were incubated with O.lnM iodinated RANTES, scintillation proximity beads and various concentrations of the compounds of the invention in 96-well plates. The amount of iodinated RANTES bound to the receptor was determined by scintillation counting. Competition curves were obtained for compounds and the concentration of compound which displaced 50%o of bound iodinated RANTES was calculated (IC50). Preferred compounds of formula (I) have an IC50 of less than 50μM.
EXAMPLE 35 The ability of compounds to inhibit the binding of MlP-lα was assessed by an in vitro radioligand binding assay. Membranes were prepared from Chinese hamster ovary cells which expressed the recombinant human CCR5 receptor. These membranes were incubated with O.lnM iodinated MlP-lα , scintillation proximity beads and various concentrations of the compounds of the invention in 96-well plates. The amount of iodinated MlP-lα bound to the receptor was determined by scintillation counting. Competition curves were obtained for compounds and the concentration of compound which displaced 50% of bound iodinated MlP-lα was calculated (IC50). Preferred compounds of formula (I) have an IC50 of less than 50μM. SCHEDULE I
SCHEME 1
f) LiAIH heat g) Amide formation h) Reductive amination SCHEME 3
isocyanate
SCHEME 4
Conditions a) Hydrogenation (Pd/C) b) Amide formation (R10CO2H, coupling agent) c) Alkyl halide, base d) Reductive amination (aldehyde and Na(AcO)3BH) e) LiAIH4, heat
SCHEME 5
[as above]
Conditions a) LiAIH4, heat b) Reductive amination (RCHO, Na(AcO)3BH) c) alkylation or reductive amination or amide formation followed by reduction d) 6M HCI, reflux e) reductive amination (NH2R2, Na(AcO)3BH SCHEME 6
Conditions
e) TFA or MeOH/HCI
SCHEME 7
Cl-Heterocycle can include:
SCHEME 8
Conditions' a) Alkyl halide, base b) Ar1C(=O)CH3, CH2O, Acetic acid c) Aryl magnesium halide or Aryl lithium addition d) Reduction (NaBH4) e) Reduction (H2/Pd/C) f) (i) Activation of OH (MeSQjCI), (ii) Displacement with R8R9NH
SCHEME 9
a) Reductive amination (R13NH2, Na(OAc)3BH) b) TFA or HCI/MeOH c) Amide formation (carboxylic acid, coupling agent or acid chloride)
SCHEME 10
Conditions: a) Alkyl halide, base b) Amide formation (R14CO2H, coupling agent or R14COCl) c) an isocyanate d) a carbamoyl chloride
SCHEME 11
SCHEME 12
Conditions a) Ar2Li b) TFA or HCI/MeOH c) Amide reduction (e.g. LiAIH4) d) Piperidine, Na(OAc)3BH SCHEME 13
Conditions a) Ester formation (Me2NCH(OtBu)2) b) Aryl lithium addition c) Ester reduction (LiAIH4) d) Bromide formation (PPh3, CBr4) e) Piperidine, base f) Ester reduction (DIBAL-H) g) Piperidine, Na(OAc)3BH
SCHEME 14
Conditions a) nBuϋ, allyl bromide b) ozonolysis; Me2S c) Piperidine, Na(OAc)3BH

Claims (16)

  1. A compound of formula (I):
    wherein:
    R1 is Cj.6 alkyl , C3,7 cycloalkyl, C3.8 alkenyl or C3.8 alkynyl, each optionally substituted with one or more of: halo, hydroxy, cyano, nitro, C3.7 cycloalkyl, NR8R9, C(O)R10, NR13C(O)R14, C(O)NRI7R18, NR19C(O)NR20R21, S(O)nR22, C 6 alkoxy (itself optionally substituted by heterocyclyl or C(O)NR23R24), heterocyclyl, heterocyclyloxy, aryl, aryloxy, heteroaryl or heteroaryloxy;
    R2 is hydrogen, C 8 alkyl, C3.8 alkenyl, C3.8 alkynyl, C3.7 cycloalkyl, aryl, heteroaryl, heterocyclyl, aryl(CM)alkyl, heteroaryl(CM)alkyl or heterocyclyl(CM)alkyl; R3 is Ct.8 alkyl, C2.8 alkenyl, NR45R46, C2_8 alkynyl, C3.7 cycloalkyl, C3.7 cycloalkenyl, aryl, heteroaryl, heterocyclyl, aryl(CM)alkyl, heteroaryl(C1 )alkyl or heterocycly^ . 4)alkyl;
    R46 is CU8 alkyl, C3.8 alkenyl, C3.8 alkynyl, C3.7 cycloalkyl, aryl, heteroaryl, heterocyclyl, aryl(CM)alkyl, heteroaryl(C,.4)alkyl or heterocyclyl(CM)alkyl; wherein the groups of R2, R3 and R46, and the heterocyclyl, aryl and heteroaryl moieties of R1, are independently optionally substituted by one or more of halo, cyano, nitro, hydroxy, S(O)qR25, OC(O)NR26R27, NR28R29, NR30C(O)R31, NR32C(O)NR33R34,
    S(O)2NR35R36, NR37S(O)2R38, C(O)NR39R40, C(O)R41, CO2R42, NR43CO2R44, C,.6 alkyl, C3.10 cycloalkyl, C 6 haloalkyl, C 6 alkoxy, C 6 haloalkoxy, phenyl, phenyl(CM)alkyl, phenoxy, phenylthio, phenyl(Cj^)alkoxy, heteroaryl, heteroaryl(CM)alkyl, heteroaryloxy or heteroaryl(C1_4)alkoxy; wherein any of the immediately foregoing phenyl and heteroaryl moieties are optionally substituted with halo, hydroxy, nitro,
    S(O)kCM alkyl, S(O)2NH2, cyano, CM alkyl, CM alkoxy, C(O)NH2, C(O)NH(CM alkyl), CO2H, CO2(CM alkyl), NHC(O)(CM alkyl), NHS(O)2(CM alkyl), C(O)(CM alkyl), CF3 or OCF3; the C3.7 cycloalkyl, aryl, heteroaryl and heterocyclyl moieties of R1, R2 and R3 being additionally optionally substituted with C 6 alkyl, C2.6 alkenyl, C2.6 alkynyl or Cι_6 alkoxy(C1.6)alkyl;
    R4, R5, R5 and R7 are, independently, hydrogen, C^ alkyl {optionally substituted by halo, cyano, hydroxy, CM alkoxy, OCF3, NH2, NH(CM alkyl), N(CM alkyl)2, NHC(O)(CM alkyl), N(CM alkyl)C(O)(CM alkyl), NHS(O)2(CM alkyl), N(CM alkyl)S(O)2(CM alkyl), CO2(CM alkyl), C(O)NH(CM alkyl), C(O)N(CM alkyl)2J C(O)NH2, CO2H, S(O)2(CM alkyl), S(O)2NH(CM alkyl), S(O)2N(CM alkyl)2, heterocyclyl or C(O)(heterocyclyl)}, S(O)2NH2, S(O)2NH(CM alkyl), C(O)N(CM alkyl)2, C(O)(CM alkyl), CO2H, CO2(CM alkyl) or C(O)(heterocyclyl); or two of R4, R5, R6 and R7 can join to form, together with the ring to which they are attached, a bicyclic ring system; or two of R4, R5, R6 and R7 can form an endocyclic bond (thereby resulting in an unsaturated ring system);
    X is C(O), S(O)2, C(O)C(O), a direct bond or C(O)C(O)NR47; k, m, n, p and q are, independently, 0, 1 or 2; R25, R26, R27, R2\ R29, R30, R31, R32, R33, R34, R35, R36, R37, R38, R39, R40, R41, R42, R43 and
    R44 are, independently, Cι_8 alkyl, C3.8 alkenyl, C3.8 alkynyl, C3.7 cycloalkyl, aryl, heteroaryl or heterocyclyl each or which is optionally substituted by halo, cyano, nitro, hydroxy, CM alkyl, CM alkoxy, SCH3, S(O)CH3, S(O)2CH3, NH2, NHCH3, N(CH3)2, NHC(O)NH2, C(O)NH2, NHC(O)CH3, S(O)2N(CH3)2, S(O)2NHCH3, CF3, CHF2, CH2F, CH2CF3 or OCF3; and R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, R36, R37, R39, R40,
    R41, R42, R43 and R44 may additionally be hydrogen;
    R8, R9, R10, R13, R14, Rπ, R18, R19, R20, R21, R23, R24, R45 and R47 are, independently, hydrogen, alkyl {optionally substituted by halo, hydroxy, C 6 alkoxy, C^ haloalkoxy, heterocyclyl or phenyl (itself optionally substituted by halo, hydroxy, cyano, CM alkyl or CM alkoxy)} , phenyl (itself optionally substituted by halo, hydroxy, nitro, S(O)kCM alkyl, S(O)2NH2, cyano, CM alkyl, C alkoxy, C(O)NH2) C(O)NH(Cu alkyl), CO2H, CO2(CM alkyl), NHC(O)(CM alkyl), NHS(O)2(CM alkyl), C(O)(CM alkyl), CF3 or OCF3) or heteroaryl (itself optionally substituted by halo, hydroxy, nitro, S(O)kC1.4 alkyl, S(O)2NH2, cyano, CM alkyl, C14 alkoxy, C(O)NH2, C(O)NH(CM alkyl), CO2H, CO2(CM alkyl), NHC(O)(CM alkyl), NHS(O)2(CM alkyl), C(O)(CM alkyl), CF3 or
    OCF3); R22 is alkyl {optionally substituted by halo, hydroxy, C,.6 alkoxy, Cx_6 haloalkoxy, heterocyclyl or phenyl (itself optionally substituted by halo, hydroxy, cyano, CM alkyl or CM alkoxy)}, phenyl (itself optionally substituted by halo, hydroxy, cyano, CM alkyl or CM alkoxy) or heteroaryl (itself optionally substituted by halo, hydroxy, cyano, Cl alkyl or CM alkoxy); the pairs of substituents: R8 and R9, R13 and R14, R17 and R18, R20 and R21, R23 and R24, R2δ and R27, R28 and R29, R30 and R31, R32 with either R33 or R34, R33 and R34, R35 and R36, R37 and R38, R39 and R40 and R43 and R44 may, independently, join to form a ring and such a ring may also comprise an oxygen, sulphur or nitrogen atom; where for any of the foregoing heterocyclic groups having a ring -N(H)- moiety, that -
    N(H)- moiety may be optionally substituted by CM alkyl (itself optionally substituted by hydroxy), C(O)(CM alkyl), C(O)NH(CM alkyl), alkyl)2 or S(O)2(CM alkyl); a ring nitrogen and/or sulphur atom is optionally oxidised to form an N-oxide and/or an S-oxide; foregoing heteroaryl or heterocyclyl rings are C- or, where possible, N-linked; or a pharmaceutically acceptable salt thereof or a solvate thereof.
  2. 2. A compound as claimed in claim 1 wherein heteroaryl is pyrrolyl, imidazolyl, pyrazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyridinyl, pyrimidinyl, pyrazinyl, pyridazinyl, thienyl, furyl, quinolinyl, isoquinolinyl, dihydroisoquinolinyl, indolyl, benzimidazolyl, benzo[b]furyl, benzo[b]thienyl, phthalazinyl, indanyl, oxadiazolyl or benzthiazolyl.
  3. 3. A compouind as claimed in claim 1 or 2 wherein aryl is phenyl.
  4. 4. A compound as claimed in claim 1, 2 or 3 wherein heterocyclyl is piperidinyl, morpholinyl, pyrrolidinyl, piperazinyl or tetrahydrofuryl.
  5. 5. A compound as claimed in claim 1 , 2, 3 or 4 wherein R4, R5, R6 and R7 are all hydrogen.
  6. 6. A compound as claimed in claim 1, 2, 3, 4, or 5 wherein X is C(O).
  7. 7. A compound as claimed in claim 1, 2, 3, 4, 5 or 6 wherein m and p are both 1.
  8. 8. A compound as claimed in claim 1, 2, 3, 4, 5, 6 or 7 wherein R2 is methyl, ethyl, allyl, cyclopropyl or propargyl.
  9. 9. A compound as claimed in claim 1, 2, 3, 4, 5, 6, 7 or 8 wherein R3 is NR45R46, aryl, heteroaryl, aryl(CM)alkyl or heteroaryl(CM)alkyl; R45 is hydrogen or Cj.6 alkyl; R46 is aryl, heteroaryl, aryl(C]^)alkyl or heteroaryl(CM)alkyl; wherein the aryl and heteroaryl groups of R3 and R46 are independently substituted by S(O)qR25, OC(O)NR26R27, NR32C(O)NR33R34 or C(O)R41, and optionally further substituted by one or more of halo, cyano, nitro, hydroxy, C 6 alkyl, C2.6 alkenyl, C2.6 alkynyl, C 6 alkoxy(C1.6)alkyl, S(O)qR25, OC(O)NR26R27, NR28R29, NR30C(O)R31, NR32C(O)NR33R34, S(O)2NR35R36, NR37S(O)2R38, C(O)NR39R40, C(O)R41, CO2R42, NR^CO^44, C3.10 cycloalkyl, C 6 haloalkyl, C^ alkoxy, Cj_6 haloalkoxy, phenyl, phenyl(CM)alkyl, phenoxy, phenylthio, phenyl(CM)alkoxy, heteroaryl, heteroaryl(C1 )alkyl, heteroaryloxy or heteroaryl(Cι_ 4)alkoxy; wherein any of the immediately foregoing phenyl and heteroaryl moieties are optionally substituted with halo, hydroxy, nitro, S(O)kCM alkyl, S(O)2NH2, cyano, Cw alkyl, CM alkoxy, C(O)NH2, C(O) H(CM alkyl), CO2H, CO2(CM alkyl), NHC(O)(CM alkyl), NHS(O)2(Cw alkyl), C(O)(CM alkyl), CF3 or OCF3; wherein q, k, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, R36, R37, R38, R39, R40, R41, R42, R43 and R44 are as defined in claim 1.
  10. 10. A compound as claimed in claim 1, 2, 3, 4, 5, 6, 7, 8 or 9 wherein R1 is 2,6- dimethoxybenzyl, 2,4,6-trimethoxybenzyl, 2,4-dimethoxy-6-hydroxybenzyl, 3-(4- dimethylamino-phenyl)prop-2-enyl, (l-phenyl-2,5-dimethylpyrrol-3-yl)methyl, 2- phenylethyl, 3-phenylpropyl, 3-R/S-phenylbutyl, 3-cyano-3,3-diphenylpropyl, 3- cyano-3-phenylρropyl, 4-(N-methylbenzamido)-3-phenylbutyl or 3,3-diphenylpropyl.
  11. 11. A pharmaceutical composition which comprises a compound of the formula (I) as claimed in claim 1, or a pharmaceutically acceptable salt thereof or solvate thereof, and a pharmaceutically acceptable adjuvant, diluent or carrier.
  12. 12. A compound of the formula (I), or a pharmaceutically acceptable salt thereof or solvate thereof, for use as a medicament.
  13. 13. A compound of formula (I), or a pharmaceutically acceptable salt thereof or solvate thereof, in the manufacture of a medicament for use in therapy.
  14. 14. A compound of formula (I), or a pharmaceutically acceptable salt thereof or solvate thereof, in the manufacture of a medicament for use in modulating CCR5 receptor activity in a warm blooded animal.
  15. 15. A method of treating a patient comprising administering a compound of formula (I) as claimed in claim 1, or a pharmaceutically acceptable salt thereof or solvate thereof, or a composition as claimed in claim 11.
  16. 16. A process for the preparation of a compound of formula (I) as claimed in claim 1 comprising: a. reductively animating a compound of formula (II):
    with an aldehyde R3CHO; or b. where R1 is optionally substituted alkyl, reacting a compound of formula (III):
    with an alkyl halide, in the presence of a base.
AU2001258981A 2000-05-17 2001-05-14 Pharmaceutically active piperidine derivatives, in particular as modulators of chemokine receptor activity Abandoned AU2001258981A1 (en)

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