O‐Sulfonamidophenylimines undergo intramolecular sulfonamidation/oxidation to produce 1,2‐disubstituted benzimidazoles upon treatment with palladium(II) chloride/(diacetoxyiodo)benzene and potassium carbonate at room temperature. The substituent scope at the 2‐position of the benzimidazole can be extended to alkyl, aryl, alkenyl, acyl, and ester functional groups under mild conditions.
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Fu et al. (2011) studied this question.