Palladium-catalyzed direct sulfonylation of C-H bonds with the insertion of sulfur dioxide

A palladium-catalyzed direct sulfonylation of C-H bonds with the insertion of sulfur dioxide under mild conditions is reported. The sulfonylative couplings with the insertion of sulfur dioxide into C-H bonds are effective, and two classes of sulfonylative products are formed in moderate to good yields by the combination of radical chemistry and palladium-catalyzed C-H activation.