Copper-Catalyzed Multicomponent Reaction of DABCO·(SO₂)₂, Alcohols, and Aryl Diazoniums for the Synthesis of Sulfonic Esters

A Cu-catalyzed multicomponent cascade reaction of DABCO·(SO₂)₂ (DABSO), alcohol, and aryl diazonium tetrafluoroborate was developed which afforded sulfonic esters in moderate to good chemical yields. In this reaction, the SO₂ surrogate DABSO was used for the first time in the synthesis of sulfonic aliphatic esters. This multicomponent reaction was carried out under mild conditions and tolerated a wide range of substrates, which provides a new and efficient strategy for the synthesis of sulfonic esters