An efficient synthesis of 1-aryl-benzo-γ-sultams, 1-aryl-1,3-dihydrobenzo[c]isothiazole-2,2-dioxides, was achieved in 65-99% yields via the Rh-catalyzed intramolecular aromatic C-H functionalization of N,N-diaryl diazosulfonamides with 0.5 mol% Rh2(oct)4 as the catalyst.
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Yang et al. (2014) studied this question.
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