Organocatalysis of asymmetric aldol reaction in water: comparison of catalytic properties of (S)-valine and (S)-proline amides
作者:A. S. Kucherenko、D. E. Siyutkin、R. R. Dashkin、S. G. Zlotin
DOI:10.1007/s11172-013-0132-z
日期:2013.4
(S)-Valine amides containing (S)- or (R)-α-phenylethyl substituents at N1 atom efficiently catalyze asymmetric aldol reactions between cyclic (heterocyclic) ketones and aromatic aldehydes in water, predominantly giving rise to the aldol anti-diastereomers in high yields (up to 98%) and enantiomeric excess (up to 94%).
Indium-trichloride catalyzed mukaiyama-aldol reaction in water: Solubility, aggregation and internal pressure effect
作者:Teck-Peng Loh、Jian Pei、Kevin Siong-Ve Koh、Guo-Qiang Cao、Xu-Ran Li
DOI:10.1016/s0040-4039(97)00595-9
日期:1997.5
Studies on the effects of water and the binding characteristic of InCl3 in the Mukaiyama-aldol reaction with an in depth mechanistic probe on the probable internalpressure and aggregation effects exerted in this media.
(1R,2R)-Bis[(S)-prolinamido]cyclohexane Modified with Ionic Groups: The First C2-Symmetric Immobilized Organocatalyst for Asymmetric Aldol Reactions in Aqueous Media
作者:Sergei V. Kochetkov、Alexandr S. Kucherenko、Sergei G. Zlotin
DOI:10.1002/ejoc.201100707
日期:2011.10
The first C2-symmetric immobilized organocatalyst for asymmetricaldolreactions containing the (1R,2R)-bis[(S)-prolinamido]cyclohexane unit tagged with two imidazolium+/PF6– ion pairs has been synthesized. In its presence, (hetero)aromatic aldehydes reacted with linear or cyclicketones in aqueous media to yield chiral aldols with high diastereo- and enantioselectivities and the catalyst could be
Electron deficiency of aldehydes controls the pyrrolidine catalyzed direct cross-aldol reaction of aromatic/heterocyclic aldehydes and ketones in water
作者:Swapandeep Singh Chimni、Dinesh Mahajan
DOI:10.1016/j.tet.2005.03.045
日期:2005.5
A synthetically useful pyrrolidine catalyzed direct cross-aldol reaction of aromatic/heterocyclic aldehydes with ketones in water affords the aldol addition product in up to 93% yield. Electrophilicity of the aldehydes controls the course of the reaction.
Simple amphiphilic isosteviol–proline conjugates as chiral catalysts for the direct asymmetric aldol reaction in the presence of water
作者:Ya-Jie An、Yun-Xiao Zhang、Ya Wu、Zhao-Min Liu、Chao Pi、Jing-Chao Tao
DOI:10.1016/j.tetasy.2010.04.019
日期:2010.4
activity (up to >99% yield) and stereoselectivity (up to 99:1 dr, >99% ee) for the direct aldolreaction of cyclohexanone and substitutedbenzaldehydes at room temperature in the presence of water. In addition, solventeffects, catalyst loading, substrate scope, temperature, and the influence of water on the reactions were investigated. These results demonstrate that the catalysts with a chiral concave