A novel visible-light-catalyzed tandem radical addition/1,5-hydrogen atom transfer/cyclization cascade of 2-alkynylarylethers with sulfonyl chlorides in 2-methyltetrahydrofuran was developed under photocatalyst- and additive-free conditions. This reaction relies on unique energy transfer and solvent-radical relay strategies to generate sulfonyl radicals for the preparation of a series of sulfonyl-functionalized dihydrobenzofurans in moderate to high yields catalyzed by visible light or solar radiation.

中文翻译：

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可见光催化串联自由基加成/1,5-氢原子转移/2-炔基芳基醚与磺酰氯的环化

在无光催化剂和无添加剂条件下，开发了一种新型可见光催化串联自由基加成/1,5-氢原子转移/环化级联的 2-炔基芳基醚与磺酰氯在 2-甲基四氢呋喃中。该反应依赖于独特的能量转移和溶剂自由基中继策略来产生磺酰基自由基，以在可见光或太阳辐射的催化下以中等至高产率制备一系列磺酰基官能化的二氢苯并呋喃。