Hydrogen-Bonding Asymmetric Metal Catalysis with α-Amino Acids: A Simple and Tunable Approach to High Enantioinduction
作者:Yingdong Lu、Tim C. Johnstone、Bruce A. Arndtsen
DOI:10.1021/ja904185b
日期:2009.8.19
While asymmetric transition-metal catalysis has become a powerful method for constructing chiral products, a challenge in this field is the identification of the correct ligand for high selectivity. We report here a simple approach to chiral catalyst formation: coupling of an available pool of Brønsted acids, namely, amino acid derivatives, with tunable ligands on copper catalysts. This system can
虽然不对称过渡金属催化已成为构建手性产物的有力方法,但该领域的一个挑战是识别正确的高选择性配体。我们在这里报告了一种形成手性催化剂的简单方法:将可用的布朗斯台德酸池(即氨基酸衍生物)与铜催化剂上的可调配体偶联。该系统可用于产生许多不同的手性环境,只需改变所使用的氨基酸或配体,并为快速筛选和鉴定高对映选择性的正确组合提供支架。后者在铜催化亚胺的炔基化反应中得到了说明,ee 高达 99%。