Copper-Catalysed Allylic Substitution Using 2,8,14,20-Tetrapentylresorcinarenyl-Substituted Imidazolium Salts
作者:Murat Kaloğlu、Neslihan Şahin、David Sémeril、Eric Brenner、Dominique Matt、İsmail Özdemir、Cemal Kaya、Loïc Toupet
DOI:10.1002/ejoc.201501070
日期:2015.11
Unsymmetrical imidazolium salts, each having one nitrogen atom (N1) substituted by a cavity-shaped TPR group (TPR = 2,8,14,20-tetrapentylresorcinaren-5-yl), were tested in situ as proligands for the copper-catalysed allylic arylation of cinnamyl bromide with arylmagnesium halides. The catalytic systems produced mixtures of linear (l) and branched (b) arylated compounds in variable proportions, with
不对称咪唑盐,每个都有一个氮原子 (N1) 被空腔形 TPR 基团(TPR = 2,8,14,20-四戊基间苯二酚-5-基)取代,作为铜催化烯丙基的前配体进行了原位测试肉桂基溴与芳基卤化镁的芳基化。催化系统产生不同比例的线性 (l) 和支化 (b) 芳基化化合物的混合物,其中 b/l 比最高 (78:22) 用于最拥挤的咪唑鎓盐,即第二个氮原子(N2)被甲基取代。从咪唑鎓盐之一获得的 N-杂环卡宾配合物通过 X 射线衍射研究进行表征。