Abstract
A visible-light-induced three-component reaction of 2-aryl indoles/benzimidazoles, Hantzsch esters, and sodium pyrosulfite through a radical cascade cyclization process with the insertion of sulfur dioxide is described. It provides a novel and powerful way for the synthesis of alkylsulfonated isoquinolinones. Hantzsch esters and Na2S2O5 are employed as alkyl radical precursors and SO2 surrogate, respectively. This transformation exhibits good functional group tolerance and substrate applicability under mild conditions.
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