<i>C</i><sub>2</sub>-Symmetric Diphosphinite Ligands Derived from Carbohydrates. The Strong Influence of Remote Stereocenters on Asymmetric Rhodium-Catalyzed Hydrogenation
作者:Mohamed Aghmiz、Ali Aghmiz、Yolanda Díaz、Anna Masdeu-Bultó、Carmen Claver、Sergio Castillón
DOI:10.1021/jo0496502
日期:2004.10.1
Modular ligands of C2 symmetry (13a−e, 14a,b,d, and ent-9), systematically modified at positions 2 and 5, were easily prepared from d-glucosamine, d-glucitol, and tartaric acid, respectively. The application of these ligands in the rhodium-catalyzed hydrogenation of methyl acetamidoacrylate, methyl acetamidocinnamate, and dimethyl itaconate shows that both the configuration and the substituents at
分别从d-葡萄糖胺,d-葡萄糖醇和酒石酸容易制备C 2对称的模块化配体(13a - e,14a,b,d和ent - 9),在位置2和5处进行了系统修饰。这些配体在乙酰氨基丙烯酸甲酯,乙酰氨基doc酸甲酯和衣康酸二甲酯的铑催化氢化中的应用表明,四氢呋喃骨架的位置2和5的构型和取代基均对方法的对映选择性有很大影响。