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
Propylene carbonate is shown to be an environmentally friendly and sustainable replacement for dichloromethane and acetonitrile in proline-catalysed a-hydrazinations of aldehydes and ketones. Enantioselectivities comparable to those obtained in conventional solvents or ionic liquids can be obtained, even when using a lower catalyst loading.
Application of hydroxyproline derivatives in enantioselective α-amination reactions in organic and aqueous environments: a structure-activity relationship study
作者:András A. Gurka、Kornél Szőri、Milán Szőri、Mihály Bartók、Gábor London
DOI:10.1007/s11224-016-0873-z
日期:2017.4
We examined the activity of a series of L-hydroxyproline derivatives in enantioselective α-amination reaction between diethyl azodicarboxylate and propanal both in organic and aqueous media. In organic media most of the catalysts showed high activity and enantioselectivities comparable to that accessible with L-proline that is among the best catalysts in the reaction. The catalysts showed good activity
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.