A simple synthesis of the phenanthrene scaffold from α‐bromochalcones under visible‐light photoredox catalysis is described. The corresponding α‐keto vinyl radicals are generated under irradiation with blue light in the presence of photocatalyst fac‐[Ir(ppy)₃]. The radical subsequently undergoes intramolecular cyclization with the ortho‐aryl/heteroaryl ring to afford the phenanthrene scaffold.

中文翻译：

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可见光光氧化还原催化α-溴环十二烷的分子内环化反应合成菲。

描述了一种在可见光光氧化还原催化下从α-溴化查耳酮简单合成菲支架的方法。在存在光催化剂fac- [Ir（ppy）₃ ]的情况下，在蓝光照射下会生成相应的α-酮乙烯基。该自由基随后与邻-芳基/杂芳基环进行分子内环化，从而提供菲骨架。