Herein, we reported the heterogeneous photocatalytic C–H alkylation of indoles with diazo compounds using graphitic carbon nitride (g-C₃N₄) as the photocatalyst. The reaction was carried out under a simple operation and mild conditions. In addition, the catalyst was found to be stable and reusable after five reaction cycles. The photochemical reaction proceeds via an intermediary of a carbon radical, which is generated from diazo compounds through a visible-light-promoted proton-coupled electron transfer (PCET) process.

中文翻译：

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氮化碳使重氮化合物对吲哚进行非均相光催化 C-H 官能化

在此，我们报道了使用石墨氮化碳（gC ₃ N ₄）作为光催化剂，吲哚与重氮化合物的非均相光催化C-H烷基化反应。该反应操作简单，条件温和。此外，发现该催化剂在五个反应循环后稳定且可重复使用。光化学反应通过碳自由基的中介进行，碳自由基是通过可见光促进的质子耦合电子转移（PCET）过程从重氮化合物产生的。