A novel and green photocatalytic strategy for the synthesis of C-4-acylated coumarins with α-keto acids and 3-nitrocoumarin has been developed. This operationally simple protocol works under mild reaction conditions, providing convenient access to 4-acyl coumarin derivatives. The control experimental results showed that the nitro radical produced by the cleavage of the C–N bond acts as an electron
开发了一种新型绿色光催化策略,用于用 α-
酮酸和
3-硝基
香豆素合成 C-4-酰化
香豆素。这个操作简单的协议在温和的反应条件下工作,提供了方便地获取 4-酰基
香豆素衍
生物。对照实验结果表明,C-N键断裂产生的硝基自由基作为电子受体完成光催化循环,实现氧化还原中性反应。