practically synthesized using catalyticenantioselectivecyanosilylation of cyclohexyl phenyl ketone (6a) as a key step. Cyanohydrin 7a with 94% ee was obtained with 1 mol% of Gd-5 catalyst. The key α-hydroxy carboxylic acid 8 was synthesized from 7a in an enantiomerically pure form without column chromatography. Other cycloalkyl phenyl ketones, except cyclopentyl phenyl ketone (6e-H) gave products with
using catalyticenantioselectivecyanosilylation of cyclohexyl phenyl ketone (9a) as a key step is described. The key reaction proceeded with 94% ee using 1 mol% of Gd-1 catalyst, and was performed on a 100 g-scale. In addition, a short catalyticenantioselective synthesis of the versatile intermediate for Scios Nova analogues of antimuscarinic agents (7) is described. Application of the catalytic enantioselective
Method of producing oxybutynin and its derivatives
申请人:THE UNIVERSITY OF TOKYO
公开号:US20040006243A1
公开(公告)日:2004-01-08
An oxybutynin and its derivatives are produced by reacting a phenylketone with a silylcyanide in the presence of a specified asymmetric catalyst to obtain a siloxynitrile, and then reacting the siloxynitrile with a reducing agent and oxidizing the resulting aldehyde, or subjecting the siloxynitrile to a hydrolysis.