A novel approach for the efficient cleavage of the amide bonds in tertiary amides is reported. Based on the selective radical abstraction of a benzylic hydrogen atom by a CuBr₂/Selectfluor hybrid system followed by a selective cleavage of an N–C bond, an acyl fluoride intermediate is formed. This intermediate may then be derivatized in a one-pot fashion. The reaction proceeds under mild conditions and exhibits a broad substrate scope with respect to the tertiary amide moiety as well as to nitrogen, oxygen, and carbon nucleophiles for the subsequent derivatization. Mechanistic studies suggest that the present reaction proceeds via a radical-polar crossover process that involves benzylic carbon radicals generated by the selective radical abstraction of a benzylic hydrogen atom by the CuBr₂/Selectfluor hybrid system. Furthermore, a synthetic application of this method for the selective cleavage of peptides is described.

中文翻译：

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使用溴化铜（II）/ Selectfluor杂化体系通过自由基-极性交换有效裂解叔酰胺键

报道了有效裂解叔酰胺中酰胺键的新方法。基于CuBr ₂ / Selectfluor杂化体系对苄基氢原子的选择性自由基抽象，然后选择性裂解N-C键，形成了酰基氟中间体。然后该中间体可以一锅法衍生。该反应在温和的条件下进行，并且对于叔酰胺部分以及随后进行衍生反应的氮，氧和碳亲核试剂表现出宽泛的底物范围。机理研究表明，本反应是通过自由基-极性交换过程进行的，该过程涉及通过CuBr ₂对苄基氢原子的选择性自由基抽象而产生的苄基碳自由基。/ Selectfluor混合系统。此外，描述了该方法用于肽的选择性切割的合成应用。