The present invention relates to an improved process for the preparation of [[2(S)-[[4(R)- (3 -hydroxypheny l)-3 (R),4-dimethyl- 1 -piperidinyl] methyl] - 1 -oxo- 3 -phenylpropyl] amino] acetic acid dihydrate, represented by the following structural formula:
本发明涉及一种改进的制备[[2(S)-[[4(R)-(3-羟基苯基)-3(R),4-二甲基-1-
哌啶基]甲基]-1-氧代-3-苯基丙基]
氨基]
乙酸二水合物的方法,其结构式如下: