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-4-基-戊-1-酮的方法,该方法通过使用适当的酶还原1-(4-
氟苯基)-5-吗啉-4-基-戊-1,5-二酮或通过使用酶分离(R,S)-5-(4-
氟苯基)-5-羟基-1-吗啉-4-基-戊-1-酮而得到。本发明还提供了一种制备
依折麦布的方法,包括以下步骤:a) 用羟基保护基保护化合物(S)-5-(4-
氟苯基)-5-羟基-1-吗啉-4-基-戊-1-酮,b)
水解所得化合物,c) 与手性辅助剂缩合,d) 与保护
亚胺化合物反应,e) 转化为烷基酯,f) 环化,g) 去保护基得到
依折麦布。