3-Arylsulfonylquinolines from N -Propargylamines via Cascaded Oxidative Sulfonylation Using DABSO.

We report a cascaded oxidative sulfonylation of N -propargylamine via a three-component coupling reaction using DABCO·(SO 2 ) 2 (DABSO). 3-Arylsulfonylquinolines were obtained by mixing diazonium tetrafluoroborate, N -propargylamine, and DABSO under argon atmosphere in dichloroethane (DCE) for 1 h. In a radical pathway, DABSO was utilized as the sulfone source and an oxidant in this radical-mediated cascaded reaction.