Ligand Effect and Control of<i>E</i>- and<i>Z</i>-Selectivity in the Silver-Catalyzed Synthesis of 4-Bromooxazolines
作者:Valerie H. L. Wong、Andrew J. P. White、T. S. Andy Hor、King Kuok Mimi Hii
DOI:10.1002/adsc.201500157
日期:2015.8.10
The stereospecific intramolecular hydroamination of alkynyl trichloroacetimidates catalyzed by bis(pyridyl)silver(I) complexes to form 1,3‐oxazolines and oxazines has been investigated in greater detail. The rate of the reaction is profoundly influenced by the electronic character of the pyridyl ligand; leading to optimized conditions whereby reactions can be completed at ambient temperature with catalyst
对双(吡啶基)银(I)配合物催化形成1,3-恶唑啉和恶嗪的炔基三氯乙酰亚胺的立体定向分子内胺化反应进行了更详细的研究。反应速率受到吡啶基配体的电子特性的深刻影响;导致优化的条件,从而可以在环境温度下以低至1 mol%的催化剂负载量完成反应,同时保持对(Z)异构体的立体选择性。还介绍了进一步研究以确定配体的作用以及(E)-异构体的合成。