Preparation process of .alpha.-L-aspartyl-L-phenylalanine methyl ester
    12.
    发明授权
    Preparation process of .alpha.-L-aspartyl-L-phenylalanine methyl ester 失效
    α-L-天冬氨酰-L-苯丙氨酸甲酯的制备方法

    公开(公告)号:US4801732A

    公开(公告)日:1989-01-31

    申请号:US171134

    申请日:1988-03-22

    CPC分类号: C07K5/0613

    摘要: This invention relates to an improved process for preparing .alpha.-L-aspartyl-L-phenylalanine methyl ester. More specifically, it relates to a process for preparing .alpha.-L-aspartyl-L-phenylalanine methyl ester which comprises treating, as a raw material, N-formyl-.alpha.-L-aspartyl-L-phenylalanine in methanol in the presence of an acid to form .alpha.-L-aspartyl-L-phenylalanine dimethyl ester, hydrolyzing the .alpha.-L-aspartyl-L-phenylalanine dimethyl ester by bringing it into contact with hydrochloric acid in the presence of methanol as desired, separating the thereby-precipitated .alpha.-L-aspartyl-L-phenylalanine methyl ester hydrochloride and neutralizing the hydrochloride. Further, this invention also provides a process for preparing .alpha.-L-aspartyl-L-phenylalanine methyl ester capable of using, as a raw material, N-formyl-.alpha.-L-aspartyl-L-phenylalanine which contains N-formyl-.beta.-L-aspartyl-L-phenylalanine in an amount of 30% by weight or less.

    摘要翻译: 本发明涉及一种制备α-L-天冬氨酰基-L-苯丙氨酸甲酯的改进方法。 更具体地说,本发明涉及一种制备α-L-天冬氨酰基-L-苯丙氨酸甲酯的方法,该方法包括在甲醇中存在下,以N-甲酰基-α-天冬氨酰基-L-苯丙氨酸为原料 酸形成α-L-天冬氨酰基-L-苯丙氨酸二甲酯,通过使α-L-天冬氨酰-L-苯丙氨酸二甲酯在需要的甲醇存在下与盐酸接触,分离由此沉淀的α -L-天冬氨酰基-L-苯丙氨酸甲酯盐酸盐并中和盐酸盐。 此外,本发明还提供一种制备能够以N-甲酰基-β-L-天冬氨酰基-L-苯丙氨酸为原料的α--L-天冬氨酰基-L-苯丙氨酸甲酯的制备方法,该方法含有N-甲酰基-β -L-天冬氨酰基-L-苯丙氨酸,其量为30重量%以下。

    Process for production of .beta.-phenylserine
    14.
    发明授权
    Process for production of .beta.-phenylserine 失效
    生产β-苯基丝氨酸的方法

    公开(公告)号:US4605759A

    公开(公告)日:1986-08-12

    申请号:US636289

    申请日:1984-07-31

    IPC分类号: C07C227/16 C07C99/00

    CPC分类号: C07C227/16

    摘要: In the production of a .beta.-phenylserine by reacting glycine with a benzaldehyde in the presence of an alkali and treating the product with an acid, a novel process which comprises carrying out the reaction in a mixed solvent composed of water and a hydrophobic organic solvent. The presence of a phase transfer catalyst or a surface-active agent in this reaction system promotes the reaction and the .beta.-phenylserine can be obtained in a high yield.

    摘要翻译: 在碱存在下使甘氨酸与苯甲醛反应制备β-苯基丝氨酸,并用酸处理该产物的新方法包括在由水和疏水性有机溶剂组成的混合溶剂中进行反应。 该反应体系中相转移催化剂或表面活性剂的存在促进了反应,可以高产率获得β-苯基丝氨酸。