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    • 2. 发明授权
    • Process for preparing .alpha.-aspartyl-L-phenylalanine methyl ester
    • 制备α-天门冬酰基-L-苯丙氨酸甲酯的方法
    • US4638081A
    • 1987-01-20
    • US608983
    • 1984-05-10
    • Biagio Elefante
    • Biagio Elefante
    • C07C231/00C07C67/00C07C231/02C07C231/12C07K5/075C07C101/32C07K5/06
    • C07K5/0613Y10S530/801
    • A process for preparing .alpha.-L-aspartyl-L-phenylalanine methyl ester consisting of:bringing N-formyl-L-aspartic anhydride and L-phenylalanine methyl ester, in a molar ratio equal or approximately equal to 1:1, into contact with a solid cation exchange resin having free sulphonic, phosphonic or carboxylic acid groups, the ration of the acid equivalents of said resin acid groups to the number of moles of the one or other reagent being equal to or less than about 1:1, and operating in the liquid phase in an inert organic solvent at a temperature of about 40.degree. C. or less, until a mixture of N-formyl-.alpha.-L-aspartyl-L-phenylalanine methyl ester and N-formyl-.beta.-L-aspartyl-L-phenylalanine methyl ester forms in which the .alpha. isomer prevails over the .beta. isomer;deformylating said N-formyl-.alpha.-L-aspartyl-L-phenylalanine methyl ester and N-formyl-.beta.-L-aspartyl-L-phenylalanine methyl ester; andseparating and recovering the .alpha.-L-aspartyl-L-phenylalanine methyl ester from said deformylated products.
    • 一种制备α-L-天冬氨酰基-L-苯丙氨酸甲酯的方法,其特征在于:将N-甲酰基-L-天冬氨酸酐和L-苯丙氨酸甲酯以等于或大约等于1:1的摩尔比与 具有游离磺酸,膦酸或羧酸基团的固体阳离子交换树脂,所述树脂酸基团的酸当量与所述一种或其它试剂的摩尔数的比例等于或小于约1:1,并且操作 在惰性有机溶剂中,在约40℃或更低的温度下在液相中,直到N-甲酰基-α-L-天冬氨酰基-L-苯丙氨酸甲酯和N-甲酰基-β-L-天冬氨酰基 L-苯丙氨酸甲酯形式,其中α异构体优于β异构体; 使N-甲酰基-α-L-天冬氨酰基-L-苯丙氨酸甲酯和N-甲酰基-β-L-天冬氨酰基-L-苯丙氨酸甲酯变形, 并从所述去甲酰化产物中分离和回收α-L-天冬氨酰基-L-苯丙氨酸甲酯。