The ultrasound-assisted synthesis of some novel fused-ring heterocyclic systems bearing structurally diverse benzazoles via a copper-catalyzed cross-coupling reaction

Herein, a novel ultrasonic-assisted process involving CuI-catalyzed intra-molecular C–H activation of benzazoles has been developed. This methodology offers affordable starting materials, mild reaction conditions, easy handling of the catalyst, a simple work-up process, and short reaction times. Graphical abstract