We report a mild and operationally simple trifluoroacylation strategy of olefines, that utilizes trifluoroacetic anhydride as a low-cost and readily available reagent. This light-mediated process is fundamentally different from conventional methodologies and occurs through a trifluoroacyl radical mechanism promoted by a photocatalyst, which triggers a C−O bond fragmentation. Mechanistic studies (kinetic isotope effects, spectroelectrochemistry, optical spectroscopy, theoretical investigations) highlight the evidence of a fleeting CF₃CO radical under photoredox conditions. The trifluoroacyl radical can be stabilized under CO atmosphere, delivering the trifluoroacetylation product with higher chemical efficiency. Furthermore, the method can be turned into a trifluoromethylation protocol by simply changing the reaction parameters. Beyond simple alkenes, this method allows for chemo- and regioselective functionalization of small-molecule drugs and common pharmacophores.

中文翻译：

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由可见光促进的三氟乙酸酐的 C-O 键断裂引发烯烃的自由基三氟乙酰化

我们报告了一种温和且操作简单的烯烃三氟酰化策略，该策略利用三氟乙酸酐作为低成本且易于获得的试剂。这种光介导的过程与传统方法有着根本的不同，它通过由光催化剂促进的三氟酰基自由基机制发生，从而触发 CO 键断裂。机理研究（动力学同位素效应、光谱电化学、光谱学、理论研究）突出了转瞬即逝的 CF ₃的证据光氧化还原条件下的 CO 自由基。三氟酰基自由基可以在 CO 气氛下稳定，提供具有更高化学效率的三氟乙酰化产物。此外，该方法可以通过简单地改变反应参数变成三氟甲基化协议。除了简单的烯烃外，该方法还允许小分子药物和常见药效团的化学和区域选择性功能化。