Organocatalysts and methods of use in chemical synthesis
申请人:Wang Wei
公开号:US20090088588A1
公开(公告)日:2009-04-02
The present invention is directed to compositions comprising organocatalysts that facilitate stereo-selective reactions and the method of their synthesis and use. Particularly, the invention relates to metal-free organocatalysts for facilitation of stereo-selective reactions, and the method of their synthesis and use.
A highly efficient kinetic resolution of Morita–Baylis–Hillman adducts achieved by N–Ar axially chiral Pd-complexes catalyzed asymmetric allylation
作者:Feijun Wang、Shengke Li、Mingliang Qu、Mei-Xin Zhao、Lian-Jun Liu、Min Shi
DOI:10.1039/c1cc15543a
日期:——
Palladium complexes with an axially chiral NâAr framework have been developed. These complexes showed high stereoselectivities in asymmetric allylic arylation to achieve the kinetic resolution of MoritaâBaylisâHillman adducts, affording up to 99% ee of (E)-allylation products and 92% ee of recovered MoritaâBaylisâHillman adducts.
Asymmetric metal-catalysed epoxidation of electron-deficient olefins
作者:Mark Bailey、Ian Staton、Peter R Ashton、István E Markó、W David Ollis
DOI:10.1016/s0957-4166(00)86103-0
日期:1991.1
The SYN diastereospecific epoxidation of acyclic beta-hydroxyketones (beta-hydroxyacrylates) and cyclic beta-hydroxyketones using titanium and vanadium catalysts is reported. Some initial results on the asymmetric epoxidation of these systems using the Sharpless titanium-tartrate catalyst are also described.