PROCESS FOR PREPARATION OF RILPIVIRINE INTERMEDIATE

摘要

The present invention relates to the preparation of a key Rilpivirine intermediate namely, (E)-4-(2-cyanoethenyl)-2,6-dimethylphenylamine hydrochloride (II) by a process comprising reaction of the tetrafluoroborate salt of the diazonium ion of 2,6- dimethyl-4-amino-l-carboxybenzyl phenylamine (VI) with acrylonitrile in presence of palladium acetate, followed by treatment with an acid and its subsequent conversion to the hydrochloride salt (II), wherein the undesired Z isomer is less than 0.5% and provides Rilpivirine hydrochloride having Z isomer less than 0.1%.