N-Arenesulfonyl-2-aminomethylpyrrolidines Novel Modular Ligands and Organocatalysts for Asymmetric Catalysis
作者:Nils Dahlin、Anders Bøgevig、Hans Adolfsson
DOI:10.1002/adsc.200404098
日期:2004.8
A novel series of (S)-N-arenesulfonyl-2-aminomethylpyrrolidines were prepared in high overall yield starting from N-Boc-L-proline. The mono-sulfonyldiamines were evaluated as organocatalysts in the asymmetric α-amination of propanal using diethyl azadicarboxylate (DEAD) as the amine source. The initially formed α-aminated aldehyde was reduced in situ to the corresponding N-aminooxazolidinone, which
In Situ Catalyst Improvement in the Proline-Mediated α-Amination of Aldehydes
作者:Hiroshi Iwamura、Suju P. Mathew、Donna G. Blackmond
DOI:10.1021/ja046258x
日期:2004.9.1
proline-mediated α-amination of aldehydes exhibits autoinductive rate behavior and amplification of product enantiomericexcess. Further experiments highlight the role of product, offering suggestions for the design of catalysts of improved efficiency for such transformations. The unusual characteristics exhibited by these reactions implicate amino acid catalysis in rationalizations of the origin of biological
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
Enamine Carboxylates as Stereodetermining Intermediates in Prolinate Catalysis
作者:Jason E. Hein、Jordi Burés、Yu-hong Lam、Matthew Hughes、K. N. Houk、Alan Armstrong、Donna G. Blackmond
DOI:10.1021/ol2023533
日期:2011.10.21
Experimental and computational studies probing the nature of Intermediates in the alpha-amination of aldehydes catalyzed by prolinate salts support an enamine carboxylate intermediate in the stereodetermining step.