Organonickel complexes encumbering bis-imidazolylidene carbene ligands: Synthesis, X-ray structure and catalytic insights on Buchwald-Hartwig amination reactions
作者:Muthukumaran Nirmala、Gandhi Saranya、Periasamy Viswanathamurthi、Roberta Bertani、Paolo Sgarbossa、Jan Grzegorz Malecki
DOI:10.1016/j.jorganchem.2016.12.029
日期:2017.3
bis(diimidazolylidene) NHC ligands and two non coordinating bromide counter ions in tetradentate C4 fashion. A survey of their catalytic activity in Buchwald−Hartwig amination has been performed. The newly synthesized complexes 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
合成了四种新的配位均化双(二咪唑基亚甲基)镍(II)配合物(C1和C2),并通过元素分析,NMR(1 H和13 C)以及ESI-质谱进行了表征。通过单晶X射线衍射分析鉴定了配合物C1的分子结构,结果表明该配合物具有扭曲的方形平面几何形状,四齿C中具有螯合双(二咪唑基亚甲基)NHC配体和两个非配位溴化物抗衡离子。4时尚。已经对其在布赫瓦尔德-哈特维格胺胺化中的催化活性进行了调查。新合成的配合物还可以在KO t存在下催化芳基氯的胺化反应。卜 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。反应范围包括电子变化的芳基氯和含氮杂芳基氯,包括吡啶和喹啉衍生物。在最佳反应条件下,仲胺和伯胺均具有良好的耐受性。