Process for preparing steroidal 3-oxo-4,6-dienes such as
17-hydroxy-3-oxo-17.alpha.-pregna-4,6-diene-21-carboxylic
acid.gamma.-lactone
    3.
    发明授权
    Process for preparing steroidal 3-oxo-4,6-dienes such as 17-hydroxy-3-oxo-17.alpha.-pregna-4,6-diene-21-carboxylic acid.gamma.-lactone 失效
    制备甾体3-氧代-4,6-二烯的方法,如17-羟基-3-氧代-17 {60-节 - 4,6-二烯-21-羧酸{65-内酯

    公开(公告)号:US4155906A

    公开(公告)日:1979-05-22

    申请号:US856886

    申请日:1977-12-02

    IPC分类号: C07J1/00 C07J21/00 C07J19/00

    CPC分类号: C07J21/003

    摘要: A process for preparing 17-hydroxy-3-oxo-17.alpha.-pregna-4,6-diene-21-carboxylic acid .gamma.-lactone by contacting 17-hydroxy-3-oxy-17.alpha.-pregna-3,5-diene-21-carboxylic acid .gamma.-lactone with an appropriate halogenating agent in the presence of an amine base, the corresponding hydrohalide salt thereof, and approximately 1-2 molar equivalents (relative to the lactonic starting material) of water, using a cold solvent as the contact medium, and heating the resultant mixture with a dehydrohalogenating agent, is disclosed.

    摘要翻译: 通过使17-羟基-3-氧基-17α-磷酸酯-3,5-二烯与17-羟基-3-氧代-17α-核苷酸 -21-羧酸γ-内酯与适当的卤化剂在胺碱存在下,其相应的氢卤酸盐和约1-2摩尔当量(相对于内酯原料)的水,使用冷溶剂作为 接触介质,并用脱卤化氢剂加热所得混合物。

    Method and intermediates for producing .alpha.-L-aspartyl-L-phenylalanine
    5.
    发明授权
    Method and intermediates for producing .alpha.-L-aspartyl-L-phenylalanine 失效
    生产α-L-天冬氨酰-L-苯丙氨酸的方法和中间体

    公开(公告)号:US4555362A

    公开(公告)日:1985-11-26

    申请号:US610376

    申请日:1984-05-15

    摘要: This invention encompasses a method and intermediates for preparing a commercial sweetening agent, .alpha.-L-aspartyl-L-phenylalanine methyl ester. The process involves reacting L-aspartic acid with diketene to form N-acetoacetyl-L-aspartic acid which is converted to N-acetoacetyl-L-aspartic anhydride by reaction with acetic anhydride. N-acetoacetyl-L-aspartic anhydride is reacted with L-phenylalanine methyl ester to provide N-acetoacetyl-.alpha.-L-aspartyl-L-phenylalanine methyl ester which is converted to .alpha.-L-aspartyl-L-phenylalanine methyl ester by reaction with hydroxylamine hydrochloride.

    摘要翻译: 本发明包括制备商业甜味剂α-L-天冬氨酰基-L-苯丙氨酸甲酯的方法和中间体。 该方法包括使L-天冬氨酸与双烯酮反应形成N-乙酰乙酰基-L-天冬氨酸,其通过与乙酸酐反应转化为N-乙酰乙酰基-L-天冬氨酸酐。 N-乙酰乙酰基-L-天冬氨酸酐与L-苯丙氨酸甲酯反应,得到N-乙酰乙酰基-α-L-天冬氨酰基-L-苯丙氨酸甲酯,通过反应转化成α-L-天冬氨酰-L-苯丙氨酸甲酯 与盐酸羟胺。

    Preparation of N-formyl-L-aspartic anhydride
    8.
    发明授权
    Preparation of N-formyl-L-aspartic anhydride 失效
    N-甲酰基-L-天冬氨酸酐的制备

    公开(公告)号:US4945172A

    公开(公告)日:1990-07-31

    申请号:US442040

    申请日:1989-11-28

    IPC分类号: C07D307/66 C07K5/075

    CPC分类号: C07D307/66

    摘要: N-formyl-L-aspartic anhydride is prepared using a minimum excess of formic acid. Acetic anhydride and a C.sub.3 -C.sub.6 secondary alcohol are added to the reaction mixture to consume excess formic acid. The reaction is suitable for further reactions without modification.

    摘要翻译: 使用最少过量的甲酸制备N-甲酰基-L-天冬氨酸酐。 将乙酸酐和C 3 -C 6仲醇加入到反应混合物中以消耗过量的甲酸。 该反应适合进一步的反应而无需改性。