AN IMPROVED PROCESS FOR THE PREPARATION OF VARENICLINE AND SALT THEREOF

摘要

The present invention relates to an improved process for the preparation of varenicline and salt thereof. The present invention also provides a process for the preparation of 1- (4,5-dinitro-10-aza-tricyclo 6.3.L027 dodeca-2(7)5335-trien-10-yl)-23252- trifluoroethanone of Formula 4 using ethyl trifluoroacetate and further converted to varenicline and salt thereof