Novel α-amino acid-derived phase-transfer catalyst application to a highly enantio- and diastereoselective nitro-Mannich reaction
作者:Yuxin Liu、Zhonglin Wei、Yu Liu、Jungang Cao、Dapeng Liang、Yingjie Lin、Haifeng Duan
DOI:10.1039/c7ob02501g
日期:——
New quaternary ammonium types of bifunctional asymmetric phase-transfer catalysts bearing multiple hydrogen-bonding donors derived from α-amino acids were readily prepared and found to be highly efficient in the asymmetric nitro-Mannich reactions of amidosulfones. Very broad substrate generality was observed, and the products were achieved in high enantio-/diastereoselectivities (90–>99.9% ee, 90 : 10
带有来自α-氨基酸的多个氢键供体的新型双功能不对称相转移催化剂的季铵盐易于制备,并在酰胺砜的不对称硝基-曼尼希反应中非常有效。观察到非常广泛的底物通用性,并且以高对映/非对映选择性(90-> 99.9%ee,90:10至92:8 dr)获得了产物。与以前的报道相比,脂肪族酰胺砜的对映选择性已提高到很高的水平(91–93%ee)。