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Extra resources for Amino Acids and Peptides (SPR Amino Acids, Peptides (RSC))vol.23
N-Methyl-D-aspartic acid hydrate io an important natural protein amino acid derivative that. has been included in this year's published X-ray work as has L-lanthionine. N-acety1amino)-U-n-butylnorleucine,'"' and Na-acetyl-N-methylL-tryptophanamide 3"5 The crystal structure of the intensely sweet L-aspartamidc (51 1, an . inverso-dipeptide been reported . derivative from one structural point. r. r. heir own right. r. studies continue to provide practical analytical support for amino acid studies, as in assignments of absolute configuration to amethyl a-amino acids through detection of the precise chemical shift for the methyl proton resonances in aqueous solutions containing the chiral lanthanoid shift c u r o ~ i u m ~ I I I ) .
LS2 Pyroglutamic acid processing C + N-Boc (S>-pyroglutaminol, and alkylation) gives C2S14S)- and C ~ S , ~ R ) - H O ~ C . C H C N H ~ ) . C H ~ C H ( W Z H ) C C H Z ) ~ P ~ , Cn = 1,3,5), as 4-substituted glutamic acid analogues for neuroexc itatory activity studies. ate,'~'aridolysis after resolution, and cyclization with P h P . Like the corresponding azetidine-2,4-dicarboxylic are of considerable interest as potential agonists of N-methyl-D-aspartate receptors. "' and . - . The simple-chemicalSYElAh- ir Qf.
The maxiniunt yield Amino Acids and Peprides 26 ef glycine is pour at I O X , but. is of a level that suggests that. the results of serendipitous experiments of this type may feature in future production organic processes chemicals that create cocktail of a [though probably not for more or less useful the production of aminu acids! 1 . '" been shown Since HCN synthesis) were to and NHo to be react. 5% yield through presenting these compounds to the erythrose - fornamidine reaction mixture is a convincing proposal for the genesis of this amino acid.