Distal Stereocontrol Using Guanidinylated Peptides as Multifunctional Ligands: Desymmetrization of Diarylmethanes via Ullman Cross-Coupling
作者:Byoungmoo Kim、Alex J. Chinn、Daniel R. Fandrick、Chris H. Senanayake、Robert A. Singer、Scott J. Miller
DOI:10.1021/jacs.6b03444
日期:2016.6.29
guanidine-containing peptides as multifunctional ligands for transition-metal catalysis and its application in the remote desymmetrization of diarylmethanes via copper-catalyzed Ullman cross-coupling. Through design of these peptides, high levels of enantioinduction and good isolated yields were achieved in the long-range asymmetriccross-coupling (up to 93:7 er and 76% yield) between aryl bromides and malonates
我们报道了一类新型含胍肽作为过渡金属催化多功能配体的开发及其在通过铜催化乌尔曼交叉偶联二芳基甲烷远程去对称化中的应用。通过这些肽的设计,芳基溴和丙二酸之间的长程不对称交叉偶联(高达 93:7 er 和 76% 产率)实现了高水平的对映诱导和良好的分离产率。我们的机制研究表明,远端立体控制是通过肽的路易斯碱性C端羧酸酯与底物的远端芳烃之间的Cs桥相互作用来实现的。