Rhodium(II)-Catalyzed Divergent Dearomative Cyclization of 1,3-Azoles with Cyclopropenes.
Herein, we report a rhodium(II)-catalyzed divergent dearomative cyclization of benzimidazoles and benzoxazoles with cyclopropenes that proceeds through a unified azolium ylide mechanism. Scaffold tuning of the 1,3-azole substrates enables two distinct pathways: pyrroloimidazoles from benzimidazoles and benzoxazoloazepi...