An asymmetric synthesis of dual orexin receptor antagonist MK-6096 (1) is described. Key steps for the trans-2,5-disubstituted piperidinyl ether fragment include a biocatalytic transamination, a trans-selective Mukaiyama aldol, and a regioselective pyridyl SNAr process. The pyrimidyl benzoic acid was synthesized via a Negishi coupling and a nitrile hydrolysis. Coupling of the two fragments via a catalytic T3P-mediated amidation completed the synthesis. Unusual behaviors in the hydrolysis of pyrimidyl benzonitrile and the amide coupling of the pyrimidyl benzoic acid are also described.
[EN] PROCESS FOR THE PREPARATION OF AN OREXIN RECEPTOR ANTAGONIST<br/>[FR] PROCÉDÉ DE PRÉPARATION D'UN ANTAGONISTE DU RÉCEPTEUR DE L'OREXINE
申请人:MERCK SHARP & DOHME
公开号:WO2012058129A1
公开(公告)日:2012-05-03
The present invention is directed to processes for preparing a pyridyl piperidine compound which is an antagonist of orexin receptors, and which is useful in the treatment or prevention of neurological and psychiatric disorders and diseases in which orexin receptors are involved.
作者:John Y. L. Chung、Yong-Li Zhong、Kevin M. Maloney、Robert A. Reamer、Jeffrey C. Moore、Hallena Strotman、Alexei Kalinin、Ronnie Feng、Neil A. Strotman、Bangping Xiang、Nobuyoshi Yasuda
DOI:10.1021/ol5028249
日期:2014.11.21
An asymmetric synthesis of dual orexin receptor antagonist MK-6096 (1) is described. Key steps for the trans-2,5-disubstituted piperidinyl ether fragment include a biocatalytic transamination, a trans-selective Mukaiyama aldol, and a regioselective pyridyl SNAr process. The pyrimidyl benzoic acid was synthesized via a Negishi coupling and a nitrile hydrolysis. Coupling of the two fragments via a catalytic T3P-mediated amidation completed the synthesis. Unusual behaviors in the hydrolysis of pyrimidyl benzonitrile and the amide coupling of the pyrimidyl benzoic acid are also described.