Synthesis of Aromatic Sulfonamides through a Copper-Catalyzed Coupling of Aryldiazonium Tetrafluoroborates, DABCO·(SO2)2, and N-Chloroamines

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A copper-catalyzed aminosulfonylation of aryldiazonium tetrafluoroborates, DABCO·(SO 2 ) 2, and N -chloroamines is described. This coupling reaction provides an efficient and simple approach to a wide range of sulfonamides in moderate to good yields under mild conditions. Mechanistic investigation suggests that a radical process and transition-metal catalysis are merged in this tandem reaction.