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.
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
Efficient catalysts for asymmetric Mannich reactions
作者:Michał Rachwalski、Tim Leenders、Sylwia Kaczmarczyk、Piotr Kiełbasiński、Stanisław Leśniak、Floris P. J. T. Rutjes
DOI:10.1039/c3ob40681d
日期:——
Efficient chiral catalysts for direct asymmetric three-component Mannich reactions of ketones, aldehydes and an amine (p-anisidine) have been developed. The corresponding β-amino carbonyl compounds (Mannich adducts) were obtained in good chemical yields and excellent enantio- and diastereoselectivities. The reaction conditions have been optimized by invoking ultrasonication and the influence of some structural moieties of the catalysts on the chemical yield and stereoselectivity of the Mannich products has been evaluated.
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.