Catalytic asymmetric cross-dehydrogenative coupling: activation of C–H bonds by a cooperative bimetallic catalyst system
作者:Weidi Cao、Xiaohua Liu、Ruixue Peng、Peng He、Lili Lin、Xiaoming Feng
DOI:10.1039/c3cc41315b
日期:——
A cooperative bimetallic catalyst system was applied in the catalytic asymmetric cross-dehydrogenative coupling of β-ketoesters and xanthene. Various optically active xanthene derivatives bearing a quaternary stereogenic carbon center were obtained in moderate to good yields (up to 90%) with excellent enantioselectivities (up to 99% ee). Meanwhile, a transition-state model was proposed to explain the origin of the asymmetric induction.
一种双金属协同催化体系被应用于β-酮酯与咕吨的催化不对称交叉脱氢偶联反应中。以中等至良好的产率(高达90%)合成了多种带有季碳立体中心的手性咕吨衍生物,且具有极佳的对映选择性(高达99% ee)。同时,提出了一种过渡态模型,以解释不对称诱导的起源。