Synthesis of enantiomerically pure quaternary glutamic acids via chemo- and diastereoselective alkylation of (5S)-3-([2-meth-oxycarbonyl]ethyl)-5-phenyl-5,6-dihydro-2H-1,4-oxazin-2-one - Harwood, Laurence M.; Tyler, Simon N. G.; Drew, Michael G. B.; Jahans, Archie; MacGilp, Iain D. (ARKIVOC, 2000)
doi: 10.3998/ark.5550190.0001.514