Highly functionalized α-2,3-methanoamino acid esters were prepared by the cyclopropanation of dehydroaspartic acid esters with 2-methoxyfuran or 2-siloxyfuran derivatives. These reactions proceed smoothly in the absence of any catalysts, bases, additives, or solvents.
An intramolecular oxa-Michael reaction on α,β-unsaturated α-amino-δ-hydroxycarboxylic acid esters. Synthesis of functionalized 1,3-dioxanes
作者:L. Becerra-Figueroa、S. Movilla、J. Prunet、G. P. Miscione、D. Gamba-Sánchez
DOI:10.1039/c7ob03066e
日期:——
A highly diastereoselective intramolecular oxa-Michael reaction on α,β-unsaturated α-amino-δ-hydroxycarboxylic acid esters is presented; 1,3-dioxanes functionalized in positions 2,4 and 6 were obtained in good yields and with excellent selectivities; an experimental and computational study was carried out to understand the reaction course in terms of yields and selectivities. This reaction proceeds
Amino Acids and Peptides; XLIII<sup>1</sup>. Dehydroamino Acids; XVIII<sup>2</sup>. Synthesis of Dehydroamino Acids and Amino Acids from<i>N</i>-Acyl-2-(dialkyloxyphosphinyl)-glycin Esters; II
New non-proteogenic aminoacids bearing an enol aryl-ether moiety.
作者:M. Daumas、L. Vo-Quang、F. Le Goffic
DOI:10.1016/s0040-4020(01)88758-5
日期:1992.3
Aminoacids bearing an enol aryl-ether moiety have been synthesized by a new method allowing a great versatility in the introduction of N-protective groups and enol ether functions. This method involves a Wittig-Horner condensation affording alpha,beta-dehydro homoserine ether derivatives, followed by a regio and stereoselective isomerization into the desired E enol ether. Clean deprotection was achieved providing new 2-amino-4-aryloxybut-3(E)-enoic acids 3.
PREPARATION OF HORNER-WADSWORTH-EMMONS REAGENT: METHYL 2-BENZYLOXYCARBONYLAMINO-2- (DIMETHOXY- PHOSPHINYL)ACETATE