Prolinamides Bearing Thiourea Groups as Catalysts for Asymmetric Aldol Reactions
作者:Stamatis Fotaras、Christoforos G. Kokotos、Evaggelia Tsandi、George Kokotos
DOI:10.1002/ejoc.201001417
日期:2011.3
based on α-amino acid amides (proline, valine, and threonine) and chiral diamines bearingthioureagroups were synthesized and their activities for aldolreactions were studied. The catalyst based on (S)-proline and (1S,2S)-diphenylethylenediamine proved to be an excellent catalyst, providing the products of reactions between ketones and aromatic aldehydes in high to quantitative yields and with high
A novel trifunctional organocatalyst for the asymmetric aldol reaction: a facile enantioselective synthesis of β-hydroxyketones
作者:B.V. Subba Reddy、K. Bhavani、A. Raju、J.S. Yadav
DOI:10.1016/j.tetasy.2011.05.001
日期:2011.4
A new L-prolinamide trifunctional catalyst has been developed for the enantioselective aldol reaction of various aromatic and aliphatic aldehydes with acetone. This method provides high yields of beta-hydroxyketones (up to 90%) with good enantioselectivity (up to 92%) at a low catalyst loading (10 mol %). (C) 2011 Elsevier Ltd. All rights reserved.