Rhodium(II)-Catalyzed C(sp 3 )-H Diamination of Arylcyclobutanes.

Activated by multiple consecutive oxidative radical-polar crossover and desaturation processes, the selective diamination of arylcyclobutanes, which is difficult to perform by classical metallonitrene C-H insertion, was achieved in a short time by rhodium(II) catalysis using N-fluorobenzenesulfonimide (NFSI) as the oxidant and nitrogen source.