Rhodium(iii)-catalyzed direct C–H activation of 2-aryl-3H-indoles: a strategy for 4-heteroaryl pyrazole synthesis

A novel protocol for synthesizing 4-heteroaryl pyrazoles from readily available 2-aryl-3H-indoles and diazopyrazolones through the rhodium(iii)-catalyzed C–H bond activation has been achieved. This redox-neutral strategy features powerful reactivity, tolerates various functional groups, and proceeds with moderate yields under mild reaction conditions.