Ligand‐Facilitated Reductive Coupling of Benzyl Chlorides with Aryl Chlorides Catalyzed by Well‐Defined Heteroleptic Ni (II)‐NHC Complexes
作者:Gusheng Lu、Ruipeng Li、Zhengwang Shen、Qinjia Wu、Hongmei Sun
DOI:10.1002/aoc.5741
日期:2020.9
3‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylidene), complex 1 exhibited superior catalytic activity in the magnesium‐mediated reductive coupling of benzyl chlorides with aryl chlorides, featuring outstanding tolerance of both coupling partners with steric demand. This study discloses a ligand‐facilitated reductive coupling of benzyl chlorides with aryl chlorides, which provides a new and practical synthetic
新型杂合Ni(II)配合物,带有高度受阻但具有柔性的IPr *配体,Ni(IPr *)(PPh 3)Br 2(1)和Ni(IPr *)(PCy 3)Br 2(2)(IPr * = 1,3-双(2,6-双(二苯甲基)-4-甲基苯基)咪唑-2-亚基可以轻松制备,产率分别为78%和89%。两者均通过元素分析和NMR光谱进行了表征,并对1进行了X射线晶体学分析。与2及其类似物相比,其空间要求较低的IPr配体(IPr = 1,3-二(2,6-二异丙基苯基)咪唑-2-亚基)复杂1在苄基氯与芳基氯的镁介导的还原偶联中表现出卓越的催化活性,这两种偶联伙伴均具有出色的空间耐受性。这项研究揭示了苄基氯与芳基氯的配体促进还原偶联,为二芳基甲烷的合成提供了一种新的实用合成工具。