Trisubstituted piperazin-2,5-diones
    5.
    发明授权
    Trisubstituted piperazin-2,5-diones 失效
    三取代哌嗪-2,5-二酮

    公开(公告)号:US5214145A

    公开(公告)日:1993-05-25

    申请号:US647618

    申请日:1991-01-28

    IPC分类号: C07D241/08

    CPC分类号: C07D241/08

    摘要: Disclosed is a process for preparation of an amino acid, such as phenylalanine, with a high degree of optical purity. The process makes use of the same amino acid as a chiral template.

    摘要翻译: 公开了具有高光学纯度的氨基酸如苯丙氨酸的制备方法。 该方法利用与手性模板相同的氨基酸。

    Process for preparation of amino acids
    6.
    发明授权
    Process for preparation of amino acids 失效
    氨基酸制备方法

    公开(公告)号:US4992552A

    公开(公告)日:1991-02-12

    申请号:US406995

    申请日:1989-09-14

    IPC分类号: C07D241/08

    CPC分类号: C07D241/08

    摘要: Disclosed is a process for preparation of an amino acid, such as phenylalanine, with a high degree of optical purity. The process makes use of the same amino acid as a chiral template.

    摘要翻译: 公开了具有高光学纯度的氨基酸如苯丙氨酸的制备方法。 该方法利用与手性模板相同的氨基酸。

    Nutritive glycerol esters of .beta.-acyloxy butyrates
    7.
    发明授权
    Nutritive glycerol esters of .beta.-acyloxy butyrates 失效
    β-酰氧基丁酸酯的营养甘油酯

    公开(公告)号:US5519161A

    公开(公告)日:1996-05-21

    申请号:US453549

    申请日:1995-05-03

    IPC分类号: C07C69/675 C07C69/66

    CPC分类号: C07C69/675

    摘要: Novel compositions that are useful as nutrients are disclosed. These compounds are preferably water soluble parenteral nutrients and are glycerol esters of .beta.-acyloxybutyrates of the formula ##STR1## wherein each R is the same or different and is hydrogen, or --COCH.sub.2 CHOR'CH.sub.3), provided that at least one R is not hydrogen and wherein R' is a linear acid ester of even carbon number from 2 to 20 carbons. These compositions are useful as a substitute for glucose in feeding.

    摘要翻译: 公开了可用作营养物质的新型组合物。 这些化合物优选是水溶性肠胃外营养物,并且是式“IMAGE”的β-酰氧基丁酸酯的甘油酯,其中每个R相同或不同,为氢或-COCH 2 CHOR'CH 3),条件是至少一个R不是氢 并且其中R'是碳数为2至20个碳原子的直链酸酯。 这些组合物可用作饲料中葡萄糖的替代物。

    Process for preparation of dipeptides
    8.
    发明授权
    Process for preparation of dipeptides 失效
    二肽制备方法

    公开(公告)号:US5144073A

    公开(公告)日:1992-09-01

    申请号:US406994

    申请日:1989-09-14

    申请人: John C. Hubbs

    发明人: John C. Hubbs

    IPC分类号: C07D241/08 C07K5/075

    CPC分类号: C07D241/08 C07K5/0613

    摘要: Disclosed is a process for synthesis of a dipeptide such as N-acetyl-L-.alpha.-aspartyl-L-phenylalanine methyl ester wherein one amino acid serves as a chiral template which allows for synthesis of a second amino acid residue to form said dipeptide. The process involves several novel steps such as a nucleophile addition step. In addition, several novel intermediates are described.

    摘要翻译: 公开了一种合成二肽的方法,例如N-乙酰基-L-α-天门冬酰基-L-苯丙氨酸甲酯,其中一个氨基酸用作手性模板,其允许合成第二个氨基酸残基以形成所述二肽。 该方法涉及几个新的步骤,例如亲核试剂添加步骤。 另外还描述了几种新的中间体。

    Composition and process for the production of poly(3-hydroxyalkanoates)
    9.
    发明授权
    Composition and process for the production of poly(3-hydroxyalkanoates) 失效
    用于生产聚(3-羟基链烷酸酯)的组合物和方法

    公开(公告)号:US5563239A

    公开(公告)日:1996-10-08

    申请号:US336620

    申请日:1994-11-09

    IPC分类号: C08G63/06 C08G63/85

    CPC分类号: C08G63/85 C08G63/06

    摘要: Disclosed is a novel process for the production of poly(3-hydroxyalkanoates) through the condensation polymerization of esters of 3-hydroxyalkanoic acids at a temperature of about 90.degree. to 200.degree. C. in the presence of a titanium catalyst. Also is disclosed a novel composition that is a poly(3-hydroxyalkanoate) containing predominantly carboxylic ester end groups.

    摘要翻译: 公开了一种通过在钛催化剂存在下,在约90℃至200℃的温度下,通过3-羟基链烷酸的酯的缩聚制备聚(3-羟基链烷酸酯)的新方法。 还公开了一种新型组合物,其是主要含羧酸酯端基的聚(3-羟基链烷酸酯)。