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【结 构 式】

【分子编号】65591

【品名】 

【CA登记号】 

【 分 子 式 】C27H27ClF3N3O3

【 分 子 量 】533.9777096

【元素组成】C 60.73% H 5.1% Cl 6.64% F 10.67% N 7.87% O 8.99%

与该中间体有关的原料药合成路线共 1 条

合成路线1

该中间体在本合成路线中的序号:(VI)

Taranabant can be prepared by two different synthetic strategies. 2-Methyl-2-[5-(trifluoromethyl)pyridin-2-yloxy]propionic acid (I) is chlorinated with oxalyl chloride and DMF in CH2Cl2, and the resulting acid chloride is then coupled with 3-(4-chlorophenyl)-2(R,S)-(3-cyanophenyl)-1(R,S)-methylpropylamine (IIa) by means of NMM in CH2Cl2 to produce racemic taranabant, which is finally resolved employing chiral HPLC (1-3). Similarly, the target enantiomer is obtained by condensation of acid (I) with the (S,S)-amine (IIb) using cyanuric chloride and NMM as the coupling reagents (4). In an alternative method, acid (I) is converted to the carboxamide (III) by chlorination with SOCl2 followed by treatment with ammonium hydroxide. Subsequent coupling of amide (III) with the enol tosylate (IV) in the presence of Pd2(dba)3 and 1,4-bis(diphenylphosphino)butane (dppb) gives the N-acyl enamine (V). After hydrolysis of the cyano group to the corresponding carboxamide with K2CO3 and H2O2, asymmetric hydrogenation of the enamine double bond over chiral rhodium catalysts (generated from a dienerhodium complex salt and chiral diphosphine ligands) provides the desired isomer (VI). Reconversion of carboxamide (VI) to the target nitrile is finally accomplished by treatment with cyanuric chloride in DMF/MTBE (5, 6). Scheme 1.

1 Hagmann, W.K., Lin, L.S., Shah, S.K. et al. (Merck & Co., Inc.). Substituted amides. CA 2478183, EP 1496838, JP 2005519958, JP 2006257090, US 2004058820, US 6972295, WO 03077847.
2 Hagmann, W.K., Lin, L.S., Shah, S.K. et al. (Merck & Co., Inc.). Substituted amides active at the cannabinoid-1 receptor. WO 2004048317.
3 Lin, L.S., Lanza, T.J. Jr., Jewell, J.P. et al. Discovery of N-[(1S,2S)-3-(4-chlorophenyl)-2-(3-cyanophenyl)-1-methylpropyl]-2-methyl-2-[[5-(trifluoromethyl)pyridin-2-yl]oxy]propanamide (MK-0364), a novel, acyclic cannabinoid-1 receptor inverse agonist for the treatment of obesity. J Med Chem 2006, 49(26): 7584-7.
4 Chen, C., Frey, L.F., Shultz, S. et al. Catalytic, enantioselective synthesis of taranabant, a novel, acyclic cannabinoid-1 receptor inverse agonist for the treatment of obesity. Org Proc Res Devel 2007, 11(3): 616-23.
5 Campos, K.R., Klapars, A., McWilliams, J.C. et al. (Merck & Co., Inc.). Formation of tetra-substituted enamides and stereoselective reduction thereof. WO 2006017045.
6 Weissman, S.A. (Merck & Co., Inc.). Cyanation of aromatic halides. US 2006106223.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(Iia) 65586 3-[(1RS,2RS)-2-Amino-1-[(4-Chlorophenyl)Methyl]Propyl]Benzonitrile   C17H17ClN2 详情 详情
(Iib) 65587 3-[(1S,2S)-2-Amino-1-[(4-Chlorophenyl)Methyl]Propyl]Benzonitrile 732982-66-0 C17H17ClN2 详情 详情
(I) 65585 2-Methyl-2-[[5-(Trifluoromethyl)-2-Pyridinyl]Oxy]Propanoic Acid 605680-62-4 C10H10F3NO3 详情 详情
(III) 65588     C10H11F3N2O2 详情 详情
(IV) 65589     C24H20ClNO3S 详情 详情
(V) 65590     C26H21ClF3N3O2 详情 详情
(VI) 65591     C27H27ClF3N3O3 详情 详情
Extended Information