Proline catalyzed two-component, three-component and self-asymmetric Mannich reactions promoted by ultrasonic conditions
摘要:
The proline catalyzed two-component and three-component asymmetric Mannich reaction with hydroxyacetone and self-Mannich reaction with propanal were performed successfully under ultrasonic conditions in I It to afford Mannich products in 90-98% isolated yields and 81-99% ees with excellent diastereoselectivities. (c) 2006 Elsevier Ltd. All rights reserved.
Abstract The direct three-component asymmetric Mannichreactions of hydroxyacetone with anilines and aromatic aldehydes in the presence of (2S,5S)-5-(methoxycarbonyl)pyrrolidine-2-carboxylic acid afforded syn-1,2-amino alcohols in good-to-excellent yields (55∼91%) and up to 98% ee.
2-Pyrrolidinecarboxylic Acid Ionic Liquid as a Highly Efficient Organocatalyst for the Asymmetric One-Pot Mannich Reaction
作者:Xin Zheng、Yun-Bo Qian、Yongmei Wang
DOI:10.1002/ejoc.200901088
日期:2010.1
A novel one-pot three-component asymmetricMannichreaction using [EMIm][Pro] (1) as a catalyst has been developed. By employing this new reaction system, a variety of optically active β-amino carbonyl compounds were synthesized in up to 99 % yield with up to >99 dr and >99 % ee. The reaction conditions have been optimized and the mechanism for the asymmetric induction is discussed.
The Proline-Catalyzed Direct Asymmetric Three-Component Mannich Reaction: Scope, Optimization, and Application to the Highly Enantioselective Synthesis of 1,2-Amino Alcohols
作者:Benjamin List、Peter Pojarliev、William T. Biller、Harry J. Martin
DOI:10.1021/ja0174231
日期:2002.2.1
We have developed proline-catalyzed direct asymmetric three-component Mannich reactions of ketones, aldehydes, and amines. Several of the studied reactions provide beta-amino carbonyl compounds (Mannich products) in excellent enantio-, diastereo-, regio-, and chemoselectivities. The scope of each of the three components and the influence of the catalyst structure on the reaction are described. Reaction