We report herein a photocatalytic arene lactonization via carboxylic radical aromatic substitution. This procedure is characterized by its ability to cleave inert C–X bonds (X = H, F, Cl, Br, O, S) under mild and oxidant-free conditions, thus furnishing a general and operationally simple synthetic protocol for diverse substituted coumarins.

中文翻译：

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可见光促进的芳烃C–H / C–X通过羧基芳香族取代的内酯化作用†

我们在本文中报道了通过羧基芳族取代的光催化芳烃内酯化。该方法的特点是能够在温和且无氧化剂的条件下裂解惰性C–X键（X = H，F，Cl，Br，O，S），从而为各种取代的香豆素提供了通用且操作简单的合成方案。