Highly Enantioselective Diels–Alder Reaction Catalyzed by Chiral Imidazolidinone
作者:Yongjiang Wang、Xiaoliang Xu、Wen Pei
DOI:10.1080/00397910802632571
日期:2009.5.7
Abstract New chiral imidazolidinone with an indole group was synthesized and used to catalyze the Diels–Alder reaction of α,β-unsaturated aldehyde with diene. High enantiomeric excesses and good yields were obtained. The reaction media were also surveyed. The best result in terms of enantioselectivity was achieved using acrolein and 2,3-dimethylbutdiene (up to 95% ee) in CH3OH/H2O.
New Strategies for Organic Catalysis: The First Highly Enantioselective Organocatalytic Diels−Alder Reaction
作者:Kateri A. Ahrendt、Christopher J. Borths、David W. C. MacMillan
DOI:10.1021/ja000092s
日期:2000.5.1
employ organic molecules as reaction catalysts, 2 despite the widespread availability of organic chemicals in enantiopure form and the accordant potential for academic, industrial, and economic benefit. Herein, we introduce a newstrategy for organocatalysis that we expect will be amenable to a range of asymmetric transformations. In this context, we document the firsthighlyenantioselective organocatalytic
Recei Ved January 7, 2000 在过去的 30 年中,对映选择性催化已成为探索性有机合成研究中最重要的前沿领域之一。在此期间,有机金属不对称催化剂的开发取得了显着进展,进而提供了丰富的对映选择性氧化、还原、π 键活化和路易斯酸催化过程。1 然而,令人惊讶的是,使用有机分子作为反应催化剂的不对称转化相对较少,2 尽管对映纯形式的有机化学品广泛可用,并且具有相应的学术、工业和经济效益潜力。在此,我们介绍了一种新的有机催化策略,我们预计该策略将适用于一系列不对称转化。在这种情况下,我们记录了第一个高度对映选择性的有机催化 Diels-Alder 反应。3
Organocatalysis using protonated 1,2-diamino-1,2-diphenylethane for asymmetric Diels–Alder reaction
作者:Kyoung Hoon Kim、Seil Lee、Dae-Woong Lee、Dong-Hyun Ko、Deok-Chan Ha
DOI:10.1016/j.tetlet.2005.07.025
日期:2005.9
chiral 1,2-diamino-1,2-diphenylethane (DPEN) were employed in the catalytic and asymmetricDiels–Alderreaction between cyclopentadiene and crotonaldehyde. The N-3-pentyl diamine·2HCl catalyst shows high endo/exo selectivity and endo-enantioselectivity for the cycloaddition, and this organocatalysis is the first example of the use of a chiral 1,2-diamine to generate an imine intermediate which is activated