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Synthesis of Aspartame via Asymmetric Hydrogenation of N-Protected (Z)-N-α-L-Aspartyl-Δ-phenylalanine Methyl Ester
Fuganti, Claudio,Grasselli, Piero,Malpezzi, Luciana
, p. 1126 - 1128 (2007/10/02)
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ON THE SYNTHESIS OF β-PHENYLALANINE
Portelli, Mario
, p. 215 - 216 (2007/10/02)
A practical, economical and efficient two-step synthesis of β-phenylalanine and its methyl ester is reported: ?-phenylserine, 1, is chlorinated to β-chloro-β-phenylalanine, 2; the latter is hydrogenated in the presence of 10percent Pd/C catalyst to give the desired amino acid. β-Phenylalanine is separated (yield based upon β-phenylserine) as the free amino acid 3 (65.3percent yield) or as the hydrochloride 4 (79.8percent yield) or esterified to the methyl ester hydrochloride 5 (78.7percent yield).