Copper-mediated C H amination of 2H-indazoles with N–Fluorobenzenesulfonimide

A facile copper-catalyzed amination in C-3 position of 2H-indazoles using commercially available N-fluorobenzenesulfonimide (NFSI) as an amidating reagent was established in this paper. The results revealed broad substrate scope in moderate to good yields under mild conditions. The described procedure involves a radical addition process whereby new CN bonds are formed, and it provides a new protocol for the synthesis of functionalized...