While diethyl malonate with diphenyliodonium chloride in t-butyl alcohol containing potassium t-butoxide gave only low yields of diethyl phenylmalonate and diethyl diphenylmalonate, reaction with 4,4′-dichlorodiphenyliodonium chloride gave good yields of the corresponding mono- and di-(4-chlorophenyl) derivatives. In methanol, ethanol and 2-propanol arylation was repressed, the main reactions now involving
[EN] ASYMMETRIC MICHAEL AND ALDOL ADDITION USING BIFUNCTIONAL CINCHONA-ALKALOID-BASED CATALYSTS<br/>[FR] ADDITIONS ASYMETRIQUES DE MICHAEL ET D'ALDOL UTILISANT DES CATALYSEURS BIFONCTIONNELS A BASE DE CINCHONINE
申请人:UNIV BRANDEIS
公开号:WO2005121137A1
公开(公告)日:2005-12-22
One aspect of the present invention relates to quinine-based and quinidine-based catalysts. Another aspect of the invention relates to a method of preparing a derivatized quinine-based or quinidine-based catalyst comprising 1) reacting quinine or quinidine with 5 base and a compound that has a suitable leaving group, and 2) converting the ring methoxy group to a hydroxy group. Another aspect of the present invention relates to a method of preparing a chiral, non-racemic compound from a prochiral electron-deficient alkene or azo compound or prochiral aldehyde or prochiral ketone, comprising the step of: reacting a prochiral electron-deficient alkene or azo compound or prochiral aldehyde or prochiral 10 ketone with a nucleophile in the presence of a catalyst; thereby producing a chiral, non racemic compound; wherein said catalyst is a derivatized quinine or quinidine. Another aspect of the present invention relates to a method of kinetic resolution, comprising the step of reacting racemic chiral alkene with a nucleophile in the presence of a derivatized quinine or quinidine.
Catalytic Enantioselective C−C Bond Forming Conjugate Additions with Vinyl Sulfones
作者:Hongming Li、Jun Song、Xiaofeng Liu、Li Deng
DOI:10.1021/ja0511063
日期:2005.6.1
highly enantioselective catalytic conjugateaddition to vinyl sulfones. Promoted by readily accessible organocatalysts derived from C6'-OH cinchona alkaloid derivatives and under mild, air- and moisture-tolerant conditions, conjugateadditions of a wide range of alpha-cyanoacetates bearing either an alpha-aryl or an alpha-alkyl substituent to vinyl sulfones proceeded in excellent enantioselectivity and
在这篇通讯中,我们描述了第一个高度对映选择性催化共轭添加到乙烯基砜的开发。由衍生自 C6'-OH 金鸡纳生物碱衍生物的易于获得的有机催化剂促进,在温和、耐空气和耐湿的条件下,将带有 α-芳基或 α-烷基取代基的各种 α-氰基乙酸酯共轭加成到乙烯基砜以优异的对映选择性和高产率进行。因此,这种高效且操作简单的对映选择性 CC 键形成共轭加成为全碳四元立体中心的对映选择性构建提供了一种新的有用的方法。
Catalytic enantioselective conjugate additions with α,β-unsaturated sulfones
作者:Hongming Li、Jun Song、Li Deng
DOI:10.1016/j.tet.2008.11.054
日期:2009.4
development of a highlyefficient catalytic asymmetric conjugate addition to α,β-unsaturated sulfones. Utilizing practical bifunctional organic catalysts and involving air- and moisture-tolerant conditions, conjugate additions of a wide range of Michael donors to α,β-unsaturated sulfones proceeded in excellent enantioselectivity/diastereoselectivity and high yield. This efficient and operationally
The bifunctional thiourea–tertiary amine derivatives of simple chiral diamines serve as highly enantioselective catalysts for the Michael addition of α-substituted cyanoacetates to vinyl sulfones, giving an efficient protocol for the construction of an all-carbon substituted quaternary stereocentre.