Demonstrates efficient synthesis of functionalized benzoazepinones, suggesting a sustainable approach.
A green and efficient visible‐light‐induced cascade strategy for the synthesis of functionalized benzo[ b ]azepinones via radical sulfur dioxide insertion is presented. Utilizing Eosin Y as an organophotocatalyst under green LEDs irradiation, this protocol enables the rapid construction of seven‐membered azepine rings through a tandem sulfonylation/annulation sequence. The reaction proceeds under mild, transition‐metal‐free conditions, exhibiting excellent functional group tolerance and a broad substrate scope. By leveraging gaseous SO 2 surrogates (DABSO), this method provides a sustainable and atom‐economical route to diverse sulfonylated benzazepines of significant pharmaceutical interest.
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Zhang et al. (2026) studied this question.
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