2-Hydroxy-3-[(S)-prolinamido]pinanes as novel bifunctional organocatalysts for asymmetric aldol reactions in aqueous media
作者:Dmitry E. Siyutkin、Alexander S. Kucherenko、Larisa L. Frolova、Alexander V. Kuchin、Sergei G. Zlotin
DOI:10.1016/j.tetasy.2011.07.013
日期:2011.6
Novel (S)-prolinamides with stereoisomeric 2-hydroxy-3-aminopinane units have been synthesized. In the presence of (1R,2R,3S,5R)-2-hydroxy-3-[(S)-prolinamido]pinane (5 mol %) cyclic ketones reacted with (hetero-)aromatic aldehydes in aqueous media to afford chiral aldols in high yields. The reaction had moderate to high diastereo- (dr up to 91/9) and enantioselectivities (up to 83% ee). (C) 2011 Elsevier Ltd. All rights reserved.