Tunable furanoside diphosphite ligands. A powerful approach in asymmetric catalysis
作者:Montserrat Diéguez、Aurora Ruiz、Carmen Claver
DOI:10.1039/b303303a
日期:——
series of highly tunable furanoside diphosphite ligands, derived from readilyavailable D-(+)-xylose and D-(+)-glucose, are discussed. Their modular nature allows a facile systematic variation in the configuration of the stereocentres at the ligand bridge and in the biaryl substituents. This enabled to select a ligand for each particular reaction that provided enantioselectivities that are comparable to
一系列高度可调的呋喃糖苷二亚磷酸酯 配体,源于现成的 D -(+)-木糖 和 D -(+)-葡萄糖,进行了讨论。它们的模块性质允许在配体桥和联芳基取代基上的立体中心的构型的容易的系统变化。这样可以选择一个配体 对于每个提供对映选择性与最佳对映选择性相当的特定反应 催化剂 以前在不同的不对称反应中已有报道。
Chiral Diphosphites Derived fromD-Glucose: New Ligands for the Asymmetric Catalytic Hydroformylation of Vinyl Arenes
and C(5). Replacement of the tert-butyl substituent by methoxy substituents at the para positions of the biphenyl moieties improved the enantioselectivities. We have characterized the rhodiumcomplexes formed underCO/H2 by NMR techniques and in situ IR spectroscopy and have observed that there is a relationship between the structure of the [HRh(CO)2(PP)] species and their enantiodiscriminating performance