Practical Synthesis of Methyl Z-2-(N-Acetylamino) but-2-Enoate. An Intermediate to D- and L-2-Aminobutyric Acid
作者:William A. Nugent、John E. Feaster
DOI:10.1080/00397919808006866
日期:1998.5
Abstract Treatment of inexpensive L- or DL-threonine methyl ester with acetic anhydride and either pyridine or anhydrous sodium acetate at reflux results in dehydration yielding the N,N-diacetamide of the title compound in >80% yield. Monodeacetylation of the diacetamide with 0.1 equiv of triethylamine in methanol affords the title monoacetamido derivative 1 in nearly quantitative yield.
PROCESS FOR THE EFFICIENT PREPARATION OF N-SUBSTITUTED DEHYDROAMINO ACID ESTERS
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0792258A1
公开(公告)日:1997-09-03
US5559268A
申请人:——
公开号:US5559268A
公开(公告)日:1996-09-24
[EN] PROCESS FOR THE EFFICIENT PREPARATION OF N-SUBSTITUTED DEHYDROAMINO ACID ESTERS<br/>[FR] PROCEDE POUR LA PREPARATION EFFICACE D'ESTERS DE DEHYDROAMINOACIDES N-SUBSTITUES
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:WO1996016021A1
公开(公告)日:1996-05-30
(EN) A process for the preparation of N-substituted dehydroamino acid esters by contacting a $g(b)-hydroxy-$g(a)-amino acid ester or N- or O-substituted $g(b)-hydroxy-$g(a)-amino acid ester with an excess of acetic anhydride and a base is disclosed.(FR) Procédé pour la préparation d'esters de déhydroaminoacides N-substitués qui consiste à mettre en contact un ester de $g(b)-hydroxy-$g(a)-aminoacide ou $g(b)-hydroxy-$g(a)-aminoacide N- ou O-substitué avec un excès d'anhydride acétique et une base.
Stereo-Controlled Asymmetric Bioreduction of α,β-Dehydroamino Acid Derivatives
作者:Clemens Stueckler、Christoph K. Winkler、Mélanie Hall、Bernhard Hauer、Melanie Bonnekessel、Klaus Zangger、Kurt Faber
DOI:10.1002/adsc.201100042
日期:2011.5.9
α,β‐Dehydroamino acidderivatives proved to be a novel substrate class for ene‐reductases from the ‘old yellow enzyme’ (OYE) family. Whereas N‐acylamino substituents were tolerated in the α‐position, β‐analogues were generally unreactive. For aspartic acidderivatives, the stereochemical outcome of the bioreduction using OYE3 could be controlled by variation of the N‐acyl protective group to furnish