enantioselection usually depends on differences in steric interactions between prochiral substrates and a chiral catalyst. We have discovered a carbene Si-H insertion in which the enantioselectivity depends primarily on the electronic characteristics of the carbene substrate, and the log(er) values are linearly related to Hammett parameters. A new class of chiral tetraphosphate dirhodium catalysts was developed
催化对映选择通常取决于前手性底物和手性催化剂之间空间相互作用的差异。我们发现了一种卡宾 Si-H 插入,其中对映选择性主要取决于卡宾底物的电子特性,并且 log(er) 值与哈米特参数线性相关。开发了一类新的手性
四磷酸二
铑催化剂,该催化剂在二芳基卡宾插入
硅烷的 Si-H 键方面表现出优异的活性和对映选择性。计算和机械研究表明卡宾的两个芳基之间的电子差异如何导致非对映过渡态能量的差异。该研究为利用基材的电子特性进行不对称催化提供了一种新策略。