The introduction of a trifluoromethyl (CF3) group can dramatically improve a compound's biological properties. Despite the well-established importance of trifluoromethylated compounds, general methods for the trifluoromethylation of alkyl C-H bonds remain elusive. Here we report the development of a dual-catalytic C(sp3)-H trifluoromethylation through the merger of light-driven, decatungstate-catalysed hydrogen atom transfer and copper catalysis. This metallaphotoredox methodology enables the direct conversion of both strong aliphatic and benzylic C-H bonds into the corresponding C(sp3)-CF3 products in a single step using a bench-stable, commercially available trifluoromethylation reagent. The reaction requires only a single equivalent of substrate and proceeds with excellent selectivity for positions distal to unprotected amines. To demonstrate the utility of this new methodology for late-stage functionalization, we have directly derivatized a broad range of approved drugs and natural products to generate valuable trifluoromethylated analogues. Preliminary mechanistic experiments reveal that a 'Cu-CF3' species is formed during this process and the critical C(sp3)-CF3 bond-forming step involves the copper catalyst.

中文翻译：

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decatungstate和铜催化的合并，以使脂肪族C（sp3）-H三氟甲基化。

三氟甲基（CF3）基团的引入可以显着改善化合物的生物学特性。尽管三氟甲基化的化合物已确立的重要性，但是用于烷基CH键的三氟甲基化的通用方法仍然难以实现。在这里，我们报告通过光驱动，decatungstate催化的氢原子转移和铜催化的合并发展双重催化的C（sp3）-H三氟甲基化。这种金属光氧化还原方法可使用稳定的市售三氟甲基化试剂，一步就将强脂族和苄基CH键直接转化为相应的C（sp3）-CF3产品。该反应仅需要单当量的底物，并且对于未保护的胺远端的位置具有优异的选择性。为了证明这种新方法在后期功能化中的实用性，我们直接衍生了各种已获批准的药物和天然产品，以生成有价值的三氟甲基化类似物。初步的机械实验表明，在此过程中形成了“ Cu-CF3”物质，并且关键的C（sp3）-CF3键形成步骤涉及铜催化剂。