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CF3SO2Na Acted as a Bifunctional Reagent: Electrochemical Trifluoromethylation of Alkenes Accompanied by SO2-Insertion to Access Trifluoromethylated Cyclic N-Sulfonylimines.

An unprecedented electrochemical trifluoromethylation/SO 2 -insertion/cyclization process has been achieved in an undivided cell in an atom-economic fashion. The protocol relies on tandem bifunctionalization of cyanamide-based alkenes by using Langlois reagent as CF 3 and SO 2 sources under direct anodically oxidative conditions, in which two C-C bonds, two C-X bonds (N-S and S-C) and two rings were formed in a single operation. This transformation enabled efficient construction of various trifluoromethylated cyclic N-sulfonylimines from readily available materials.