The combination of light activation and N‐heterocyclic carbene (NHC) organocatalysis has enabled the use of acid fluorides as substrates in a UVA‐light‐mediated photochemical transformation previously observed only with aromatic aldehydes and ketones. Stoichiometric studies and TD‐DFT calculations support a mechanism involving the photoactivation of an ortho‐toluoyl azolium intermediate, which exhibits “ketone‐like” photochemical reactivity under UVA irradiation. Using this photo‐NHC catalysis approach, a novel photoenolization/Diels–Alder (PEDA) process was developed that leads to diverse isochroman‐1‐one derivatives.

中文翻译：

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N-杂环卡宾催化酰基氟化物的光烯醇化/Diels-Alder反应

光活化和 N-杂环卡宾 (NHC) 有机催化相结合，使得能够使用酰基氟作为 UVA 光介导的光化学转化的底物，而这种转化以前仅在芳香醛和酮中观察到。化学计量研究和 TD-DFT 计算支持涉及邻甲苯甲酰唑中间体光活化的机制，该中间体在 UVA 照射下表现出“酮样”光化学反应性。利用这种光-NHC催化方法，开发了一种新型光烯醇化/狄尔斯-阿尔德（PEDA）工艺，可产生多种异色满-1-酮衍生物。