Construction of Optically Active Quaternary Propargyl Amines by Highly Enantioselective Zinc/BINOL-Catalyzed Alkynylation of Ketoimines
作者:Gaochao Huang、Zengsheng Yin、Xingang Zhang
DOI:10.1002/chem.201301479
日期:2013.9.2
general and efficient method for the highly enantioselective alkynylation of ketoimines through a zinc/1,1′‐bi‐2‐naphthol (BINOL)‐catalyzed process has been developed. A variety of ketoimines, including α‐fluoroalkyl α‐imine esters, α‐aryl α‐imine esters, and trifluoromethyl aryl ketoimines, are applicable and provide their corresponding quaternary propargyl amines in excellent yields with high ee values
已开发出一种通过锌/ 1,1'-bi-2-萘酚(BINOL)催化的方法来对酮亚胺进行高度对映选择性炔基化的通用有效方法。各种酮亚胺,包括α-氟烷α亚胺酯,α -芳基α-亚胺酯,以及三氟甲基芳基酮亚胺,都适用,并提供其相应的季炔丙基胺在具有高极高的产率ee值的值(高达99% ee值) 。在BINOL的3,3'位上的取代基的空间和电子效应对于反应效率和对映选择性都是至关重要的。为了证明该方法的有效性,(R)‐α‐CF 3α-脯氨酸的制备方法非常高效。该方案的显着特征是其广泛的底物范围,高的反应效率(高达99%)和对映选择性(高达99% ee),低的催化剂负载量(5 mol%的BINOL衍生物)和温和的反应条件。