A new two-step, one-pot synthesis of benzo[][1,2]thiazepine 1,1-dioxides was developed, which contains a visible-light mediated aza Paternò-Büchi reaction of benzo[]isothiazole 1,1-dioxides with alkenes and a Lewis acid catalyzed ring-expansion of azetidine. In this work, the mechanism of the aza Paternò-Büchi reaction was also investigated.
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