The Scope of the Direct Proline-Catalyzed Asymmetric Addition of Ketones to Imines
作者:Wolfgang Notz、Shin-ichi Watanabe、Naidu S. Chowdari、Guofu Zhong、Juan M. Betancort、Fujie Tanaka、Carlos F. Barbas
DOI:10.1002/adsc.200404114
日期:2004.8
A full account of catalytic direct asymmetric Mannich-type reactions is presented describing the scope of amino acid-catalyzed additions of unmodified ketones to a large variety of imines. These reactions are performed under very mild, operationally simple, and environmentally friendly and benign conditions employing a one-pot, three-component protocol as well as preformed imines. Typically, products
Effects of dendritic interface on enantioselective catalysis by polymer-bound prolines
作者:Tzofit Kehat、Kerem Goren、Moshe Portnoy
DOI:10.1039/c1nj20471h
日期:——
and enantioselectivity of a three-component Mannich reaction was of an even greater magnitude. A series of experiments marked the possibility of catalysis by homogenous L-proline, detached from the resin during the reaction, highly unlikely. Model comparative studies with catalysts equipped with linear or only partially dendritic spacers emphasized the superiority of the fully dendritic spacer architecture
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.
Solid-Phase Synthesis of β-Amino Ketones Via DNA-Compatible Organocatalytic Mannich Reactions
作者:Nam Tran-Hoang、Thomas Kodadek
DOI:10.1021/acscombsci.7b00151
日期:2018.2.12
constructed by solid-phase split-and-pool synthesis are a valuable source of protein ligands. Most OBOC libraries are comprised of oligoamides, particularly peptides, peptoids, and peptoid-inspired molecules. Further diversification of the chemical space covered by OBOC libraries is desirable. Toward this end, we report here the efficient proline-catalyzed asymmetric Mannich reaction between immobilized
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.