Improved synthetic access to the β,γ-enol ether amino acids, L-2-amino-4-methoxy-trans-but-3-enoic acid and l-2-amino-4-methoxy--but-3-enoic acid
作者:Vitauts Alks、Janice R. Sufrin
DOI:10.1016/s0040-4039(00)98044-4
日期:1990.1
to L-2-amino-4-methoxy--but-3-enoic acid, exclusive of the - isomer, has been developed. The key step is direct formation of a -enol etherderivative from the corresponding dimethylacetal, by refluxing in CCl4, in the presence of hexamethyldisilazane and Me3SiI. The isomeric L- amino acid could be accessed from this route by isomerizing the intermediate, methyl DL-2-acetamido-2-amino-4-methoxy--but-3-enoate
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.
DAUMAS, M.;VO-QUANG, L.;VO-QUANG, Y.;GOFFIC, F. LE, TETRAHEDRON LETT., 30,(1989) N8, C. 5121-5124
作者:DAUMAS, M.、VO-QUANG, L.、VO-QUANG, Y.、GOFFIC, F. LE
DOI:——
日期:——
ALKS, VITAUTS;SUFRIN, JANICE R., TETRAHEDRON LETT., 31,(1990) N7, C. 5257-5260