NOVEL PROCESS

摘要

A simple, cost-effective process for preparation of efavirenz of formula (I) comprising reacting a solution of 5-chloro-a-(cyclopropylethynyl)-2-amino-a-trifluoromethyl) benzene methanol of formula (II) in an organic solvent with triphosgene in the presence of an inorganic base at a temperature range -5 °C to 25 °C, adding water and isolating compound of formula (I).