The enantioselective diethylzinc addition to imines catalyzed by chiral Cu(II)–oxazoline complexes
作者:Xin Li、Lin-Feng Cun、Liu-Zhu Gong、Ai-Qiao Mi、Yao-Zhong Jiang
DOI:10.1016/j.tetasy.2003.09.036
日期:2003.12
series of copper complexes of chiral bisoxazolines has been applied in the catalytic diethylzinc addition to N-sulfonyl imines. It has been found that the tridentate ligands 3–5 provided higher enantioselectivity than bidentate ones. Addition of 4 Å molecular sieves to the reaction system benefits the enantioselectivity. The optimal procedure for diethylzinc addition to different imines resulted in moderate
在N-磺酰基亚胺的催化二乙基锌的加成中已应用了一系列手性双恶唑啉的铜配合物。已发现三齿配体3 - 5比双齿者提供更高的对映选择性。向反应体系中加入4Å分子筛有利于对映选择性。将二乙基锌添加到不同的亚胺中的最佳步骤导致中等收率和高达82%ee的对映选择性。