An N-heterocyclic carbene-based nickel catalyst for the Kumada–Tamao–Corriu coupling of aryl bromides and tertiary alkyl Grignard reagents
作者:Shin Ando、Mai Mawatari、Hirofumi Matsunaga、Tadao Ishizuka
DOI:10.1016/j.tetlet.2016.06.042
日期:2016.7
In this study, nickel-catalyzed coupling reactions between arylhalides and tert-alkyl Grignard reagents were developed. Our original bicyclic NHC ligands reduced the formation of isomerized products, and we found that NMP as a co-solvent suppressed the reduction process. Under the optimal conditions we developed, the catalyst loading was lowered to 0.5 mol %, and catalyst loading using ortho-substituted
在这项研究中,开发了镍催化的芳基卤化物与叔烷基格氏试剂之间的偶联反应。我们最初的双环NHC配体减少了异构化产物的形成,我们发现NMP作为助溶剂抑制了还原过程。在我们开发的最佳条件下,催化剂负载量降低至0.5 mol%,使用邻位取代的芳基溴化物的催化剂负载量也适用于2.0 mol%。