Indole-Fused Benzoxepine Synthesis via Visible-Light-Driven Aerobic Dehydrogenative [5+2] Annulation

A photocatalyzed oxidative dehydrogenative annulation between 2-(1H-indol-2-yl)-phenols and alkenylphenols is presented. Various indole-fused benzoxepines can be obtained at room temperature using atom-efficient strategies. This method not only avoids the use of stoichiometric amounts of oxidants but also exhibits excellent atom economy by generating H2O as the only theoretical byproduct.

Automated summary

A photocatalyzed oxidative dehydrogenative annulation method is presented, which allows for the synthesis of various indole-fused benzoxepines using atom-efficient strategies at room temperature. This method not only avoids the use of stoichiometric amounts of oxidants, but also exhibits excellent atom economy by generating H2O as the sole theoretical byproduct.