The first palladium-catalyzed highly regioselective indolization of 2-bromo- or 2-chloroanilines with internal alkynes: Synthesis of 2,3-disubstituted indoles

ORGN 391

Ming Shen, zlu@rdg.boehringer-ingelheim.com, Guisheng Li, Jianxiu Liu, Azad Hossain, Frank Roschangar, Vittorio Farina, Chris H. Senanayake, and Bruce Z. Lu, zlu@rdg.boehringer-ingelheim.com. Department of Chemical Development, Boehringer-Ingelheim Pharmaceuticals, Inc, 800 East Leigh Street, Suite 205, Richmond, VA 23219
The first practical and economical process for synthesis of 2,3-disubstituted indole compounds has been developed with high regioselectivity by palladium-catalyzed indolization of 2- bromo - or chloro -anilines and their derivatives with internal alkynes.