Catalysts for metathesis reactions including enantioselective olefin metathesis, and related methods
申请人:TRUSTEES OF BOSTON COLLEGE
公开号:US10569261B2
公开(公告)日:2020-02-25
The present invention provides compositions comprising metal complexes, and related methods. In some embodiments, metal complexes of the invention may be useful as catalysts for chemical reactions, including metathesis reactions, wherein the catalysts exhibit enhanced activity and stereoselectivity. In some embodiments, the invention may advantageously provide metal complexes comprising a stereogenic metal atom. Such metal complexes may be useful in enantioselective catalysis.
CATALYSTS FOR METATHESIS REACTONS INCLUDING ENANTIOSELECTIVE OLEFIN METATHESIS
申请人:Trustees of Boston College
公开号:EP2242578B1
公开(公告)日:2017-11-01
CATALYSTS FOR METATHESIS REACTIONS INCLUDING ENANTIOSELECTIVE OLEFIN METATHESIS, AND RELATED METHODS
申请人:TRUSTEES OF BOSTON COLLEGE
公开号:US20170333887A1
公开(公告)日:2017-11-23
The present invention provides compositions comprising metal complexes, and related methods. In some embodiments, metal complexes of the invention may be useful as catalysts for chemical reactions, including metathesis reactions, wherein the catalysts exhibit enhanced activity and stereoselectivity. In some embodiments, the invention may advantageously provide metal complexes comprising a stereogenic metal atom. Such metal complexes may be useful in enantioselective catalysis.
<i>Z</i>- and Enantioselective Ring-Opening/Cross-Metathesis with Enol Ethers Catalyzed by Stereogenic-at-Ru Carbenes: Reactivity, Selectivity, and Curtin–Hammett Kinetics
作者:R. Kashif M. Khan、Robert V. O’Brien、Sebastian Torker、Bo Li、Amir H. Hoveyda
DOI:10.1021/ja304827a
日期:2012.8.1
The first instances of Z- and enantioselective Ru-catalyzed olefin metathesis are presented. Ring-opening/cross-metathesis (ROCM) reactions of oxabicyclic alkenes and enol ethers and a phenyl vinyl sulfide are promoted by 0.5-5.0 mol % of enantiomerically pure stereogenic-at-Ru complexes with an aryloxy chelate tethered to the N-heterocyclic carbene. Products are formed efficiently and with exceptional
介绍了 Z 和对映选择性 Ru 催化的烯烃复分解的第一个实例。0.5-5.0 mol % 的对映异构纯立体 Ru 配合物与连接在 N-杂环卡宾上的芳氧基螯合物促进了氧杂双环烯烃和烯醇醚与苯基乙烯基硫化物的开环/交叉复分解 (ROCM) 反应. 产品可高效形成且具有出色的对映选择性(> 98:2 对映异构体比)。令人惊讶的是,对映选择性 ROCM 反应以高 Z 选择性(高达 98% Z)进行。此外,反应以与芳基烯烃相反的对映选择性进行,芳基烯烃仅提供 E 异构体。提供了支持 Curtin-Hammett 动力学的初步 DFT 计算以及解释立体选择性水平和趋势的初始模型。