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Abstract
AbstractA three‐component reaction of aryldiazonium tetrafluoroborates, the 1,4‐diazabicyclo[2.2.2]octane⋅bis(sulfur dioxide) adduct [DABCO⋅(SO2)2] and hydroxylamines under catalyst‐free and additive‐free conditions has been developed, providing aryl O‐aminosulfonates in good yields. Sulfonamides could also be obtained via a one‐pot process through the reaction of aryldiazonium tetrafluoroborates, DABCO⋅(SO2)2 and amines in the presence of N‐hydroxybenzotriazole. A mechanism involving the insertion of sulfur dioxide and hydrogen atom transfer is proposed and supported by theoretical calculations.magnified image
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