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。
<i>C</i><sub>1</sub>-Symmetric Diphosphite Ligands Derived from Carbohydrates: Influence of Structural Modifications on the Rhodium-Catalyzed Asymmetric Hydroformylation of Styrene
and 26a,b) and glucofuranoside (3a, 7a, 8a,b) ligands with C1 symmetry have been prepared and used in the Rh-catalyzed asymmetrichydroformylation of styrene. The main structural features of these ligands are a) the presence of a 6-O-isopropyl group in ligands with a gluco configuration, b) the absence of 1,2-O-isopropylidene, a common group in many ligands with a furanoside skeleton, c) the presence
新的 3,5-二亚磷酸酯取代的呋喃木糖苷(1b、25a、b 和 26a、b)和具有 C1 对称性的呋喃糖苷(3a、7a、8a、b)配体已被制备并用于 Rh 催化的苯乙烯不对称加氢甲酰化. 这些配体的主要结构特征是 a) 在具有葡糖构型的配体中存在 6-O-异丙基,b) 不存在 1,2-O-异亚丙基,这是许多具有呋喃糖苷骨架的配体中的常见基团, c) 存在与 2-OH 键合的烷基链,和 d) 亚磷酸酯部分中二醇的修饰。碳水化合物骨架和二亚磷酸酯桥的修饰影响活性和选择性