Direct C5 (hetero)arylation of uracil and uridine substrates with (hetero)aryl diazonium salts under photoredox catalysis with blue light was reported. The coupling proceeds efficiently with diazonium salts and heterocycles in good functional group tolerance at room temperature in aqueous solution without transition-metal components. A plausible radical mechanism has been proposed.

中文翻译：

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尿嘧啶衍生物与重氮的水性和可见光促进的 C-H（杂）芳基化

报道了在蓝光光氧化还原催化下，用（杂）芳基重氮盐对尿嘧啶和尿苷底物进行直接 C5（杂）芳基化。在室温下，在不含过渡金属组分的水溶液中，与具有良好官能团耐受性的重氮盐和杂环化合物有效地进行偶联。已经提出了一种似是而非的激进机制。