Synthesis of naturally-occurring 4-alkylideneglutamic acids
作者:Claire M. Moody、Douglas W. Young
DOI:10.1016/s0040-4039(00)60652-4
日期:1993.9
The enaminone (4), prepared from (2S)-pyroglutamic acid, has been reacted with Grignard reagents to afford a variety of (E)-alkylidene derivatives (8). Three of these have been converted to the 4-alkylideneglutamic acids, (1), (2) and (3), which are identical to known natural products, (2) and (3) being the E-isomers.
Synthesis of Enantiomerically Pure 4-Substituted Glutamic Acids and Prolines: General Aldol Reaction of Pyroglutamate Lactam Lithium Enolate Mediated by Et2O.cntdot.BF3
作者:Jesus Ezquerra、Concepcion Pedregal、Belen Yruretagoyena、Almudena Rubio、M. Carmen Carreno、Ana Escribano、Jose Luis Garcia Ruano
DOI:10.1021/jo00114a054
日期:1995.5
4-Alkylidenyl glutamic acids, potent and selective GluR5 agonists
作者:S.Richard Baker、David Bleakman、Jesus Ezquerra、Barbara A Ballyk、Michele Deverill、Ken Ho、Rajender K Kamboj、Ivan Collado、Carmen Domı́nguez、Ana Escribano、Ana I Mateo、Concepcion Pedregal、Almudena Rubio
DOI:10.1016/s0960-894x(00)00346-2
日期:2000.8
Twenty-four 4-alkylidene glutamic acids were synthesised and tested as potential subtype selective GluR5 and 6 ligands. It was found that a critical size of alkylidene group gave potent and selective GluR5 receptor agonists. LY339624 had K(i)s of 0.0326 and >100 mu M on GluR5 and 6 receptors, respectively. (C) 2000 Published by Elsevier Science Ltd. All rights reserved.
Nucleophilic ring opening of aziridine-2-carboxylates with Wittig reagents; an enantioefficient synthesis of unsaturated amino acids
作者:Jack E. Baldwin、Robert M. Adlington、Nicholas G. Robinson
DOI:10.1039/c39870000153
日期:——
Reaction of N-tosyl- or N-acyl aziridine-(2S)-carboxylate esters with carbonyl stabilized Wittig reagents provides an isolable phosphorus ylide resulting from opening of the aziridine ring; this ylide reacts with carbonylcompounds to provide a novel synthesis of optically pure unsaturated amino acids, exemplified by enantioefficient syntheses of the naturally occuring (2S)-γ-methyleneglutamic acid