[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.
progress has been made toward the development of metal-free catalysts of enantioselective transformations, yet the discovery of organic catalysts effective at low catalyst loadings remains a major challenge. Here we report a novel synergistic catalyst combination system consisting of a peptide-inspired chiral helical (thio)urea oligomer and a simple tertiary amine that is able to promote the Michael reaction
Process for preparing optically active nitro compounds and cyano compounds
申请人:Kanto Kagaku Kabushiki Kaisha
公开号:EP1512678A1
公开(公告)日:2005-03-09
[Problem] The problem of the invention is to prepare nitro compounds and cyano compounds in high efficiency and high stereoselectivity by a simple and practical Michael reaction.
[Solution] A process for preparing optically active nitro compounds and cyano compounds representedbythechemical formula (C) using a metal complex, which is obtained by reaction of an optically active nitrogen-containing compound and a periodic table group VIII metal complex, in the asymmetric Michael reaction of a compound represented by the chemical formula (A) and a compound represented by the chemical formula (B) according to the claim 1.
Highly Enantioselective Conjugate Addition of Malonate and β-Ketoester to Nitroalkenes: Asymmetric C−C Bond Formation with New Bifunctional Organic Catalysts Based on Cinchona Alkaloids
作者:Hongming Li、Yi Wang、Liang Tang、Li Deng
DOI:10.1021/ja047281l
日期:2004.8.1
The development of readily accessible bifunctionalchiral catalysts is a desirable yet challenging goal in catalytic asymmetricsynthesis. In this communication, we describe the development of a new class of readily accessible chiralbifunctional organic catalysts that could be derived in one or two steps in high yield from either quinidine or quinine. These catalysts have been shown to catalyze a
开发易于获得的双功能手性催化剂是催化不对称合成中一个理想但具有挑战性的目标。在这篇通讯中,我们描述了一类新的易于获得的手性双功能有机催化剂的开发,该催化剂可以通过一个或两个步骤从奎尼丁或奎宁中以高产率衍生。这些催化剂已被证明可催化丙二酸甲酯和乙酯以及β-酮酯与广泛的β-取代硝基烯烃的高度对映选择性共轭加成,这是一种利用容易获得的起始材料合成重要的CC键形成反应。这种新的催化不对称反应以 91-98% 的 ee 和 71-99% 的产率进行。
An enantioselective Michael addition of malonate to nitroalkenes catalyzed by low loading demethylquinine salts in water
作者:Fu-Xin Chen、Cheng Shao、Quan Wang、Pin Gong、Dong-Yan Zhang、Bang-Zhi Zhang、Rui Wang
DOI:10.1016/j.tetlet.2007.09.168
日期:2007.11
An enantioselective Michaeladdition of malonate to nitroalkenes is efficiently catalyzed by low loading demethylquinine salts in water; the yield range from 49% to 93% and the ee up to 90%.