Nickel(II) complex incorporating methylene bridged tetradentate dicarbene ligand as an efficient catalyst toward CC and CN bond formation reactions
作者:Muthukumaran Nirmala、Govindan Prakash、Rangasamy Ramachandran、Periasamy Viswanathamurthi、Jan Grzegorz Malecki、Wolfgang Linert
DOI:10.1016/j.molcata.2014.10.031
日期:2015.2
Suzuki–Miyaura cross-coupling reaction between aryl halides and arylboronic acids under phosphine free conditions. The new complex also catalyzed the amination of aryl chlorides in the presence of KOtBu. Various aryl chlorides and amines can react smoothly to give the corresponding aminated products in moderate to high yields. Both secondary and primary amines are well tolerated under the optimal reaction conditions
为了评估N-杂环卡宾(NHCs)及其络合物的结合和催化性质,已制备了一种新的亚甲基桥连双(芳氧基-NHC)配体。合成了带有新型NHC配体的新型空气稳定的Ni(II)络合物,并通过元素分析,NMR(1 H和13 C)以及ESI-质谱法对其进行了表征。通过单晶X射线衍射分析鉴定了配合物的分子结构,该分析表明Ni(II)配合物具有正方形的平面几何形状,且配体与双负四齿C 2 O 2配位。在不含膦的条件下,芳烃卤化物与芳基硼酸之间的Suzuki-Miyaura交叉偶联反应具有较高的催化活性。新的络合物还可以在KO t Bu存在的情况下催化芳基氯化物的胺化反应。各种芳基氯化物和胺可以平稳反应,以中等至高收率得到相应的胺化产物。在最佳反应条件下,仲胺和伯胺均具有良好的耐受性。