Chiral oxazoline ligands containing a 1,2,4-triazine ring and their application in the Cu-catalyzed asymmetric Henry reaction
作者:Ewa Wolińska
DOI:10.1016/j.tet.2013.06.084
日期:2013.9
Eleven members of new ligand class incorporating a chiral oxazoline and a 1,2,4-triazine ring have been synthesized via Pd-catalyzed amination reaction of 3-halo-1,2,4-triazines with 2-(o-aminophenyl)oxazolines. Buchwald–Hartwig amination of 3-halo-1,2,4-triazines was investigated to establish the best conditions for synthesis of the title ligands. Catalytic activity of the new ligands was evaluated in
通过3-卤代1,2,4-三嗪与2-(邻氨基苯基)恶唑啉的Pd催化胺化反应合成了11种新的配体类,其中包括手性恶唑啉和1,2,4-三嗪环。研究了3-卤代1,2,4-三嗪的布赫瓦尔德-哈特维格胺胺化反应,以建立标题配体合成的最佳条件。在硝基甲烷与各种芳香族和脂肪族醛的不对称亨利反应中评估了新配体的催化活性。以高收率(高达95%)和中等至良好的对映选择性(高达82%ee)获得了β-羟基硝基烷。