Cu-Catalyzed Alkynylation of Unactivated C(sp<sup>3</sup>)–X Bonds with Terminal Alkynes through Directing Strategy
作者:Fei-Xian Luo、Xing Xu、Ding Wang、Zhi-Chao Cao、Yun-Fei Zhang、Zhang-Jie Shi
DOI:10.1021/acs.orglett.6b00289
日期:2016.5.6
and concise protocol for Cu-catalyzed cross-coupling of unactivated alkyl halides/peusudohalides with terminal alkynes to afford internal alkynes with the assistance of various amides as directing groups. Different alkyl halides/pseudohalides exhibited excellent reactivities, and the inactivated alkyl chlorides and sulfonates showed better reactivity than bromides/iodides. This is the first successful
在这封信中,我们报告了一种有效而简洁的方案,用于铜催化未活化烷基卤化物/伪卤化物与末端炔烃的交叉偶联,从而借助各种酰胺作为导向基团提供内部炔烃。不同的烷基卤化物/假卤化物显示出优异的反应性,而灭活的烷基氯化物和磺酸盐显示出比溴化物/碘化物更好的反应性。这是在没有任何添加剂的情况下直接将烷基氯化物和磺酸盐与末端炔烃进行交叉偶联的第一个成功实例。发现Cu催化剂比其他过渡金属催化剂更有效。对于末端炔烃,该反应还显示出较宽的底物范围。