The present invention relates to an improved process for the preparation of [[2(S)-[[4(R)-(3-hydroxyphenyl)-3(R),4-dimethyl-1-piperidinyl]methyl]-1-oxo-3-phenylpropyl]amino]acetic acid dihydrate, represented by the following structural formula (I).
本发明涉及一种制备[[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]
乙酸二水合物的改进工艺,其结构式(I)如下。