The present article summarizes the development of two novel and complementary catalytic methods to access ?-chiral aldehydes. A C1-symmetric chiral (P,N) ligand with a structure derived from the ubiquitous binepine scaffold has been specifically designed for
the Pd-catalyzed ?-arylation of aldehydes to access indane derivatives with a well-defined quaternary stereocenter in high yields and excellent enantioselectivities. In addition, a dinuclear palladium hydride catalyst has been synthesized for the isomerization of terminal and trisubstituted
epoxides into aldehydes and ketones respectively. Combined experimental and theoretical investigations pointed to an unprecedented 'epoxide-opening/hydride-transfer' sequence. The mechanism also features two distinct enantio-determining steps in the kinetic resolution of racemic epoxides.
本文总结了两种新颖且互补的催化方法的发展,用于获取α-手性醛类化合物。一种源自广泛存在的bipine桥架的C1对称手性(P,N)配体已经专门设计用于Pd催化的α-芳基化反应,以获得具有明确定义的四元手性中心的茚烷衍生物,产率高且选择性优异。此外,合成了一种双核钯氢化物催化剂,用于将末端和三取代环氧化物异构化为相应的醛和酮。结合实验和理论研究指出了一种前所未有的“环氧化物开环/氢转移”序列。该机制还包括在消旋环氧化物的动力学拆分过程中的两个不同的手性决定步骤。