Synthesis of Benzo[a]carbazoles via Palladium-Catalyzed Tandem Cyclization of Diarylalkynes with Isocyanides

]carbazoles via palladium-catalyzed annulation between diarylalkynes and isocyanides. This method features excellent regioselectivity and chemoselectivity, mild reaction conditions, experimental simplicity, and good functional group tolerance. Further mechanistic investigations suggest that intramolecular 1,5-acyl migration is mainly involved in this reaction system. The feasibility of the strategy was further demonstrated by late-stage modifications and photophysical property studies.