Functionalized Oxindole Construction via a Cyano Migration and Cyclization Relay Strategy

A visible-light-induced trifunctionalization of unactivated alkenes for building functionalized oxindoles through a radical cyano migration strategy is reported. This transformation employs a tandem alkene sulfonylation-initiated cyano migration/cyclization cascade process. This strategy features stable and easily accessible substrates, mild reaction conditions, metal-free catalysts, and the capability of late-stage functionalization.