Selective Functionalization of Aromatic C(sp2 )-H Bonds in the Presence of Benzylic C(sp3 )-H Bonds by Electron-Deficient Carbenoids Generated from 4-Acyl-1-Sulfonyl-1,2,3-Triazoles.

A rhodium(II)-catalyzed reaction of newly prepared 4-acyl-1-sulfonyl-1,2,3-triazoles with benzene, and its derivatives, is investigated. Acceptor/acceptor carbenoids generated from 4-acyltriazoles undergo selective insertion at aromatic C(sp2 )-H bonds in the presence of benzylic C(sp3 )-H bonds to produce N-sulfonylenaminones.