Copper-catalyzed synthesis of benzocarbazoles via α-C-arylation of ketones

A simple and efficient copper-catalyzed method for the synthesis of 11H-benzo[a]carbazoles has been developed. The protocol uses readily available substituted 2-(2-bromophenyl)-1H-indoles and ketones as starting materials and an inexpensive catalyst system. The corresponding 11H-benzo[a] carbazoles were obtained in moderate to excellent yields.