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Sample text
CF-,CH;,CHUfor use in a Strecker synthesis of 5,5-difluoro-lysine. le? eine, which over 24 h spontaneously eliminates HF to give the mixed Z/E-dehydrocysteine derivative. There are many examples of syntheses o f a-CB-hydroxyalkyl) a-amino acids, not least because there are several important natural compounds of this family land for this reason, this year's crop of examples will be found in other sections of this Chapter). h CuC11)-catalyzed from benzaldehyde giving B-phenylserine diastereoisomers.
Eine, which over 24 h spontaneously eliminates HF to give the mixed Z/E-dehydrocysteine derivative. There are many examples of syntheses o f a-CB-hydroxyalkyl) a-amino acids, not least because there are several important natural compounds of this family land for this reason, this year's crop of examples will be found in other sections of this Chapter). h CuC11)-catalyzed from benzaldehyde giving B-phenylserine diastereoisomers. A preparation of the oxazoline (36) from ethyl isocyanoacetate and ~ S ) - M ~ O C H - .
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 ) .