Enantioselective Synthesis of <i>syn</i>/<i>anti</i>-1,3-Amino Alcohols via Proline-Catalyzed Sequential α-Aminoxylation/α-Amination and Horner−Wadsworth−Emmons Olefination of Aldehydes
作者:Vishwajeet Jha、Nagendra B. Kondekar、Pradeep Kumar
DOI:10.1021/ol100856u
日期:2010.6.18
A novel and general method for asymmetric synthesis of both syn/anti-1,3-amino alcohols is described. The method uses proline-catalyzed sequential alpha-aminoxylation/alpha-amination and Horner-Wadsworth-Emmons (HWE) olefination of aldehydes as the key step. By using this method, a short synthesis of a bioactive molecule, (R)-1-((S)-1-methylpyrrolidin-2-yl)-5-phenylpentan-2-ol, is also accomplished.
Organocatalytic sequential α-aminoxylation and cis-Wittig olefination of aldehydes: synthesis of enantiopure γ-butenolides
作者:Dattatray A. Devalankar、Pandurang V. Chouthaiwale、Arumugam Sudalai
DOI:10.1016/j.tetasy.2012.02.004
日期:2012.2
A short route to enantiopure gamma-butenolides (up to 99% ee) has been developed from readily available starting materials. The strategy involves a sequential organocatalytic alpha-aminoxylation followed by cis-Wittig olefination of aldehydes. The utility of this protocol has been demonstrated in the asymmetric synthesis of trans-(+)-cognac lactone with high enantiomeric purity. (C) 2012 Elsevier Ltd. All rights reserved.
Organocatalytic Approach to (<i>S</i>)-1-Arylpropan-2-ols: Enantioselective Synthesis of the Key Intermediate of Antiepileptic Agent (−)-Talampanel
作者:Rajiv T. Sawant、Suresh B. Waghmode
DOI:10.1080/00397910903221753
日期:2010.7.12
An efficient organocatalytic route for the preparation of enantioselectivesynthesis of (S)-1-arylpropan-2-ols derivatives, including the key intermediate of antiepileptic agent (−)-talampanel is described. The key steps involved are L-proline-catalyzed asymmetric α-aminooxylation of aldehydes and regioselective tosylation of diols followed by reduction.