abstract |
of the Invention 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 2,7preparation of l-(4,5-dinitro-10-aza-tricyclo[6.3.1.0 ]dodeca-2(7),3,5-trien-10-yl)-2,2,2-trifluoroethanone of Formula 4 using ethyl trifluoroacetate and further converted to varenicline and salt thereof. |