| 摘要 |
A method for preparing an alpha -L-aspartyl-L-phenylalanine alkyl ester, which method comprises: reacting a divalent alkali salt of aspartic acid, having an amino-protective group, with an organic halo ester compound, to form a monovalent, alkali-salt, mixed,anhydride aspartate compound; and condensing the mixed,anhydride aspartate compound with an alkyl ester of L-phenylalanine under alkaline conditions and reducing the pH to an acidic condition after condensation to free the amino and carboxyl groups, to form a mixture consisting essentially of the alpha and beta alkyl ester of alpha -L-aspartyl-L-phenylalanine.
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