An efficient catalytic method to convert an alpha-C-H bond of N-alkylamines into an alpha-C-alkynyl bond was developed. In the past, such transformations were carried out under oxidative conditions, and the enantioselective variants were confined to tetrahydroisoquinoline derivatives. Here, we disclose a method for union of N-alkylamines and trimethylsilyl alkynes, without the presence of an external oxidant, and promoted through cooperative actions of two Lewis acids, B(C6F5)3 and a Cu-based complex. A variety of propargylamines can be synthesized in high diastereo- and enantioselectivity. The utility of the approach is demonstrated by late-stage site-selective modification of bioactive amines. Kinetic investigations that shed light on various mechanistic nuances of the catalytic process are presented.

中文翻译：

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通过路易斯酸/有机铜催化促进的 C-H 活化将 N-烷基胺直接转化为 N-炔丙基胺：在生物活性分子的后期功能化中的应用

开发了一种将 N-烷基胺的 α-CH 键转化为 α-C-炔基键的有效催化方法。过去，这种转化是在氧化条件下进行的，对映选择性变体仅限于四氢异喹啉衍生物。在这里，我们公开了一种在不存在外部氧化剂的情况下结合 N-烷基胺和三甲基甲硅烷基炔的方法，并通过两种路易斯酸 B(C6F5)3 和 Cu 基络合物的协同作用进行促进。可以高非对映选择性和对映选择性合成多种炔丙胺。生物活性胺的后期位点选择性修饰证明了该方法的实用性。介绍了阐明催化过程的各种机制细微差别的动力学研究。