[EN] ASYMMETRIC MICHAEL AND ALDOL ADDITION USING BIFUNCTIONAL CINCHONA-ALKALOID-BASED CATALYSTS [FR] ADDITIONS ASYMETRIQUES DE MICHAEL ET D'ALDOL UTILISANT DES CATALYSEURS BIFONCTIONNELS A BASE DE CINCHONINE
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。