Electrophotocatalytic C−H Azolation of Arenes

An electrophotocatalytic method has been developed for the dehydrogenative cross coupling of arenes with azoles employing a bicatalytic system consisting of acridinium dye and (2,2,6,6‐tetramethylpiperidin‐1‐yl)oxyl (TEMPO). The reactions are conducted in a simple undivided cell with visible‐light irradiation and requires no external chemical oxidant. Light it up: Dehydrogenative C−H/N−H cross coupling is among the most attractive methods for the construction of C−N bonds. Here, an electrophotocatalytic method has been developed for the dehydrogenative cross coupling of electron‐rich arenes with azoles. The reactions are conducted in a simple undivided cell with visible light irradiation, employ a bicatalytic system that consists of an easily available acridinium dye and TEMPO, and proceed through H2 evolution without need for external chemical oxidants.