A new sulfinate salt‐mediated radical relay for the completion of C(sp³)−H bond indenylation of cyclic ethers with readily available 2‐alkynylbenzonitriles by combining silver/tert‐butyl peroxide (TBHP) was established, providing a wide range of 3‐alkylated 1‐indenones with generally good yields. Interestingly, the current reaction system can tolerate an S‐centered radical and a C‐centered radical in one pot, in which the S‐centered radical promotes the formation of the C‐centered radical to induce a radical cascade without disturbing the reaction process. A reaction mechanism is also proposed based on control experiments.

中文翻译：

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亚硫酸盐介导的带有2-炔基苄腈的环醚向3-烷基化的1-茚满的自由基中继环化

建立了一种新的亚磺酸盐介导的自由基中继剂，通过结合过氧化银/叔丁基过氧化氢（TBHP）来完成环状醚与易于获得的2-炔基苄腈的C（sp ³）-H键茚基化反应烷基化的1-茚满，收率通常很好。有趣的是，当前的反应系统可以在一个罐中容忍一个以S为中心的自由基和一个以C为中心的自由基，其中以S为中心的自由基促进了以C为中心的自由基的形成，从而在不干扰反应过程的情况下引发了自由基的级联反应。还基于控制实验提出了反应机理。