期刊
JOURNAL OF ORGANOMETALLIC CHEMISTRY
卷 751, 期 -, 页码 711-716出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2013.09.008
关键词
Polymer-immobilized chiral catalyst; Cyclic sulfonimine; Amphiphilic polymer ligand; Hydrophobic-hydrophilic balance; Catalyst recycle
资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan [23350053]
- Grants-in-Aid for Scientific Research [23350053, 25102515] Funding Source: KAKEN
Crosslinked polymers containing chiral N-sulfonylated diamine (TsDPEN) structure were synthesized by radical polymerization of chiral N1-(4-vinylbenzenesulfonyl)-1,2-diphenylethylene-1,2-diamine, divinylbenzene and achiral vinyl monomer. The polymer-immobilized chiral complex was prepared from the polymeric TsDPEN with ruthenium dichloride p-cymene. Asymmetric transfer hydrogenation of cyclic sulfonimine was performed using the polymer-immobilized TsDPEN-Ru (II) complex. The hydrophobic-hydrophilic balance of the polymers was tuned by means of the incorporation of the achiral vinyl monomers, which strongly influenced on the catalytic activity of the polymeric catalyst. In most cases the amphiphilic polymer-immobilized chiral catalysts are highly active in the asymmetric transfer hydrogenation. Enantioenriched sultam with up to 98% ee was obtained by using polymer-immobilized chiral catalysts containing quaternary ammonium salt in CH2Cl2. Some of the polymer-immobilized chiral catalysts containing quaternary ammonium salt were successfully used in water. Up to 95% ee was obtained by using the polymeric catalyst in water. Most of the quaternized polymeric catalysts showed sufficient reactivity and higher enantioselectivities compared with that of low-molecular-weight catalyst in water. (c) 2013 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据