A Designed Approach to Enantiodivergent Enamine Catalysis
作者:Juliet Macharia、Victor Wambua、Yun Hong、Lawrence Harris、Jennifer S. Hirschi、Gary B. Evans、Mathew J. Vetticatt
DOI:10.1002/anie.201703919
日期:2017.7.17
The rational design and implementation of enantiodivergent enamine catalysis is reported. A simple secondary amine catalyst, 2‐methyl‐l‐proline, and its tetrabutylammonium salt function as an enantiodivergent catalyst pair delivering the enantiomers of α‐functionalized aldehyde products in excellent enantioselectivities. This novel concept of designed enantiodivergence is applied to the enantioselective
Synthesis and use of a stable aminal derived from TsDPEN in asymmetric organocatalysis
作者:Silvia Gosiewska、Rina Soni、Guy J. Clarkson、Martin Wills
DOI:10.1016/j.tetlet.2010.06.017
日期:2010.8
A stable aminal formed stereoselectively from (R,R)-N-tosyl-1,2-diphenyl-1,2-ethylenediamine (TsDPEN) is capable of asymmetric organocatalysis of Diels-Alder and alpha-amination reactions of aldehydes. (C) 2010 Elsevier Ltd. All rights reserved.
Direct Organo-Catalytic Asymmetricα-Amination of Aldehydes—A Simple Approach to Optically Activeα-Amino Aldehydes,α-Amino Alcohols, andα-Amino Acids
Unusual Reversal of Enantioselectivity in the Proline-Mediated α-Amination of Aldehydes Induced by Tertiary Amine Additives
作者:Donna G. Blackmond、Antonio Moran、Matthew Hughes、Alan Armstrong
DOI:10.1021/ja102718x
日期:2010.6.9
An intriguing reversal in product enantioselectivity accompanied by a change in the kinetic profile is observed in the alpha-amination of aldehydes catalyzed by proline in the presence of organic bases. Implications for the prevailing stereochemical models for proline and related aminocatalytic transformations are discussed.