A Powerful Chiral Phosphoric Acid Catalyst for Enantioselective Mukaiyama-Mannich Reactions
作者:Fengtao Zhou、Hisashi Yamamoto
DOI:10.1002/anie.201603929
日期:2016.7.25
A new BINOL‐derived chiral phosphoric acid bearing 2,4,6‐trimethyl‐3,5‐dinitrophenyl substituents at the 3,3′‐positions was developed. The utility of this chiral phosphoric acid is demonstrated by a highly enantioselective (ee up to >99 %) and diastereoselective (syn/anti up to >99:1) asymmetric Mukaiyama–Mannich reaction of imines with a wide range of ketene silyl acetals. Moreover, this method was
开发了一种新的BINOL衍生的在3,3'-位置带有2,4,6-三甲基-3,5-二硝基苯基取代基的手性磷酸。这种手性磷酸的实用性通过亚胺与多种乙烯酮甲硅烷基缩醛的不对称Mukaiyama–Mannich反应(对映选择性(ee高达99%)和非对映选择性(顺/反高达99:1))证明。此外,该方法已成功应用于具有出色的非对映和对映选择性的邻近三级和四级立体成因中心的建设。值得注意的是,BINOL衍生的N - triflyl磷酰胺构成了互补的催化剂体系,可将标题反应应用到更具挑战性的亚胺上,而无需N-( 2-羟基苯基)部分