| abstract |
4-[[6-chloro-2-[(4-cyanophenyl)amino]-4-pyrimidinyl]oxy]-3,5-dimethyl- benzonitrile is a key intermediate for the preparation of etravirine. The present invention provides a process for preparation of 4-[[6-chloro-2-[(4-cyanophenyl)amino]-4- pyrimidinyl]oxy]-3,5-dimethylbenzonitrile. The present invention also provides a novel process for the preparation of etravirine crystalline form I. The present invention further provides novel crystalline forms of etravirine, processes for their preparation and pharmaceutical compositions comprising them. |