Three-Component Asymmetric Catalytic Ugi Reaction-Concinnity from Diversity by Substrate-Mediated Catalyst Assembly
作者:Wenjun Zhao、Li Huang、Yong Guan、William D. Wulff
DOI:10.1002/anie.201310491
日期:2014.3.24
assembled in situ from a chiral biaryl ligand, an amine, water, BH3⋅SMe2 , and an alcohol or phenol. The catalyst screen included 13 different ligands, 12 amines, and 47 alcohols or phenols. The optimal catalyst system (LAP 8‐5‐47) provided α‐amino amides from an aldehyde, a secondary amine, and an isonitrile with excellent asymmetric induction. The catalytically active species is proposed to be an ion
通过筛选大量不同的 BOROX 催化剂,确定了用于三组分 Ugi 反应的第一种手性催化剂。BOROX 催化剂由手性联芳基配体、胺、水、BH 3 ⋅SMe 2 和醇或苯酚原位组装而成。催化剂筛选包括 13 种不同的配体、12 种胺和 47 种醇或酚。最佳催化剂体系 (LAP 8-5-47) 提供了来自醛、仲胺和异腈的 α-氨基酰胺,具有出色的不对称诱导能力。催化活性物质被认为是由手性硼酸阴离子和亚胺阳离子组成的离子对。