Abstract
In this paper, we reported a facial approach for the preparation of benzo[c][1,2]oxazine scaffolds via visible light induced phenyl iodine bis(trifluoroacetate) (PIFA) oxidative [4+2] annulation of vinyl benzenes with N‐aryl substituted hydroxamic acids. In the transformation, amidoxyl radicals are readily generated via covalent I–O bond formation and photo‐induced I–O cleavage from N‐aryl substituted hydroxamic acids, and their coupling with vinyl arenes in the form of [4+2] annulation delivers benzo[c]‐[1,2]oxazines derivatives. This reaction proceeds in the absence of transition metals and catalysts, exhibits broad substrate scope of both alkenes and N‐aryl substituted hydroxamic acids.
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