Herein, a hydroxyl assisted, photoredox/cobalt co‐catalyzed semi‐hydrogenation and tandem cyclization of o‐alkynylphenols is developed towards direct assembly of 2,3‐dihydrobenzofurans. Moderate to good yields were obtained for a range of sterically and electronically diverse 2‐propynolphenols under mild conditions. Mechanistic studies demonstrated the inevitable role of the alcoholic hydroxyl group with (Z)‐alkene as the real intermediate. Finally, a key low‐valent cobalt catalyzed intramolecular hydroetherification of alkene is proposed.

中文翻译：

---

羟基辅助，光氧化还原/钴共催化邻炔基苯酚的半加氢和串联环化反应，可得到2,3-二氢苯并呋喃

在本文中，发展了羟基辅助，光氧化还原/钴共催化邻炔基苯酚的半加氢和串联环化的方法，以直接组装2,3-二氢苯并呋喃。在温和的条件下，一系列空间和电子形式不同的2-丙炔酚均获得了中等至良好的收率。机理研究表明，以（Z）-烯烃为真正中间体的醇羟基不可避免地发挥了作用。最后，提出了关键的低价钴催化烯烃分子内加氢醚化反应。