ENZYMATIC PROCESS FOR THE PREPARATION OF (S)-5-(4-FLUORO-PHENYL)-5-HYDROXY- 1MORPHOLIN-4-YL-PENTAN-1-ONE, AN INTERMEDIATE OF EZETIMIBE AND FURTHER CONVERSION TO EZETIMIBE
申请人:Husain Mofazzal
公开号:US20120028316A1
公开(公告)日:2012-02-02
The present invention provides an enzymatic process for the preparation of (S)-5-(4-Fluoro-phenyl)-5-hydroxy-1morpholin-4-yl-pentan-1-one by the reduction of 1-(4-Fluoro-phenyl)-5-morpholin-4-yl-pentane-1,5-dione by using a suitable enzyme or by the resolution of (R,S)-5-(4-Fluoro-phenyl)-5-hydroxy-1morpholin-4-yl-pentan-1-one by using an enzyme. The present invention also provides process for the preparation of Ezetimibe comprising the steps of a) protecting the compound (S)-5-(4-Fluoro-phenyl)-5-hydroxy-1morpholin-4-yl-pentan-1-one with hydroxy protecting group b) hydrolyzing the obtained compound c) condensing with a chiral auxiliary d) reacting with an protected imine compound e) converting to alkyl ester f) cyclizing and g) deprotecting to obtain Ezetimibe.
本发明提供了一种酶法制备(S)-5-(4-氟苯基)-5-羟基-1-吗啉基-4-基戊-1-酮的方法,通过还原1-(4-氟苯基)-5-吗啉基-4-基戊-1,5-二酮,使用适当的酶或通过(S)-5-(4-氟苯基)-5-羟基-1-吗啉基-4-基戊-1-酮的拆分(R,S)。本发明还提供了一种制备依折他尼的方法,包括以下步骤:a) 保护化合物(S)-5-(4-氟苯基)-5-羟基-1-吗啉基-4-基戊-1-酮,使用羟基保护基;b) 水解得到的化合物;c) 与手性辅助基缩合;d) 与保护亚胺化合物反应;e) 转化为烷基酯;f) 环化;g) 去保护得到依折他尼。