Rh(III)-Catalyzed Cascade Annulation/C-H Attivation of o-Ethynylanilines with Diazo Compounds: One-Pot Synthesis of Benzo[a]carbazoles via 1,4-Rhodium Migration

A Rh(III)-catalyzed cascade annulation/C-H activation of o-ethynylanilines with, diazo compounds has-been developed. This concise method allows for the rapid formation of a number of benzo[a]carbazoles in high yields, exhibiting good functional group tolerance and scalability. The key to the success of this approach involves one C-N bond and two C-C bond formation, and an aryl-to-aryl 1,4-rhodium migration.