Catalyst-free electrochemical trifluoromethylation of coumarins using CF 3 SO 2 NHNHBoc as the CF 3 source.

An efficient electrochemical trifluoromethylation of coumarins using CF 3 SO 2 NHNHBoc as the source of the trifluoromethyl group was developed. Under catalyst-free and external oxidant-free electrolysis conditions, a range of 3-trifluoromethyl coumarins were obtained in moderate to good yields. The method could be easily scaled up with moderate efficiency.