A visible-light-engaged 2-fold site-selective alkylation of indole derivatives with aliphatic ethers or alcohols has been accomplished for easy access to symmetric 3,3′-bisindolylmethane derivatives. The experimental data suggest a sequential photoredox catalysis induced radical addition and proton-mediated Friedel–Crafts alkylation mechanism.

中文翻译：

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光氧化还原催化通过连续的C–H和C–O键裂解引起的醚/醇双双烯丙基化

为了容易获得对称的3，3′-二吲哚基甲烷衍生物，已经实现了吲哚衍生物与脂肪族醚或醇的可见光结合的2-位点选择性烷基化。实验数据表明，相继的光氧化还原催化诱导了自由基的加成和质子介导的Friedel-Crafts烷基化机理。