Novel ester derivatives of buprenorphine and their preparation processes, and long acting analgestic pharmaceutical compositions

摘要

Disclosed herein are novel buprenorphine monocarboxylic ester derivatives and dibuprenorphine dicarboxylic ester derivatives which exert a longer analgesic effect as compared to buprenorphine hydrochloride. Also disclosed are the processes for synthesizing the novel ester derivatives of buprenorphine, and long-acting analgesic pharmaceutical compositions containing a compound selected from buprenorphine base and the novel ester derivatives of buprenorphine.