Disclosed herein is an improved, commercially viable and industrially advantageous process for the preparation of substantially pure Lercanidipine intermediate, 1,1,N-trimethyl-N-(3,3-diphenylpropyl)-2-aminoethyl acetoacetate. The intermediate is useful for preparing Lercanidipine, or a pharmaceutically acceptable salt thereof, in high yield and purity. The present invention further provides a novel crystalline form of Lercanidipine hydrochloride and a process for its preparation. The present invention also provides a process for the preparation of amorphous form of Lercanidipine hydrochloride.
本文公开了一种改进的、商业可行的和工业上有利的制备基本纯Lercanidipine中间体1,1,N-三甲基-N-(3,3-二苯基丙基)-2-
氨基
乙酰乙酸酯的方法。该中间体可用于高收率和高纯度地制备Lercanidipine或其药学上可接受的盐。本发明还提供了一种新的晶体形式的Lercanidipine盐酸盐及其制备方法。本发明还提供了一种制备Lercanidipine盐酸盐无定形形式的方法。