PROCESSES FOR PREPARATION OF NARWEDINE AND ITS USE IN THE SYNTHESIS OF GALANTAMINE

摘要

The present invention relates to processes for preparation of narwedine, and use thereof in the synthesis of pure galantamine and salts thereof. The present invention further relates to a novel acid addition salt of narwedine isopropylene glycol ketal of (Formula I), which is a useful intermediate in the synthesis of narwedine and galantamine.