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    Process for the preparation of 2 thion-oxazolidinones and derivatives thereof
    1.
    发明授权
    Process for the preparation of 2 thion-oxazolidinones and derivatives thereof 失效
    2种恶唑烷酮及其衍生物的制备方法

    公开(公告)号：US3905988A

    公开(公告)日：1975-09-16

    申请号：US11631171

    申请日：1971-02-18

    Applicant: STAMICARBON

    Inventor： DAHLMANS JOHANNES J ,  BOESTEN WILHELMUS H J

    IPC: C07D263/46 ,  C07D263/52 ,  C07D85/26

    CPC classification number: C07D263/52 ,  C07D263/46

    Abstract: A process for the preparation of 2-thionoxazolidone-5 and derivatives thereof is disclosed wherein tertiary alkyl esters of secondary amino carboxylic acid or the N-thiocarbonyl chloride of an Alpha -secondary aminocarboxylic acid is subjected to the action of a proton yielding acid. The compounds produced by the process of this invention are useful as amino acid derivatives in the synthesis of peptides.

    Abstract translation: 公开了制备2-硫代恶唑烷酮-5及其衍生物的方法，其中仲氨基羧酸的叔烷基酯或α-仲氨基羧酸的N-硫代羰基氯经受质子产生酸的作用。 通过本发明方法生产的化合物可用作肽合成中的氨基酸衍生物。

    Preparation of aspartyl dipeptide-alkylesters using aqueous solvent
    2.
    发明授权
    Preparation of aspartyl dipeptide-alkylesters using aqueous solvent 失效
    使用水性溶剂制备天冬氨酰二肽 - 烷基酯

    公开(公告)号：US3879372A

    公开(公告)日：1975-04-22

    申请号：US30652472

    申请日：1972-11-15

    Applicant: STAMICARBON

    Inventor： BOESTEN WILHELMUS H J

    IPC: C07C231/00 ,  A23L27/30 ,  C07C67/00 ,  C07C231/14 ,  C07D307/66 ,  C07K5/075 ,  C07C103/52 ,  A23L1/26

    CPC classification number: C07D307/66 ,  A23L27/32 ,  C07K5/0613 ,  Y02P20/55 ,  Y10S530/801

    Abstract: A process for preparing aspartyl Alpha -amino acid lower alkyl esters is disclosed, wherein an N-protected aspartic acid anhdyride is reacted with an Alpha -amino acid lower alkyl ester at a temperature of about -10 to +50 *C, and at a pH of 4-12, in an aqueous solvent. After the reaction, the N-protective group is removed to produce the desired aspartyl Alpha -amino acid lower alkyl ester which has a peptide linkage. Many of the products produced by the present invention are useful as sweetening agents, as well as starting materials in the synthesis of polypeptides, e.g. gastrine.

    Abstract translation: 公开了一种制备天冬氨酰基α-氨基酸低级烷基酯的方法，其中将N-保护的天冬氨酸阿魏酸与α-氨基酸低级烷基酯在约-10至+50℃的温度下反应， pH为4-12，在水性溶剂中。 反应后，除去N-保护基以产生具有肽键的所需天冬氨酰基α-氨基酸低级烷基酯。

    Optical separation of methionine nitrile
    3.
    发明授权
    Optical separation of methionine nitrile 失效
    甲硝唑的光学分离

    公开(公告)号：US3683002A

    公开(公告)日：1972-08-08

    申请号：US3683002D

    申请日：1969-02-10

    Applicant: STAMICARBON

    Inventor： BOESTEN WILHELMUS H J ,  SUVERKROPP GEERTRUDES H

    IPC: A47B3/00 ,  C07C121/42

    CPC classification number: C07C319/28 ,  C07B2200/07 ,  C07C323/60

    Abstract: A process for preparing optically active methionine, methionine nitrile, and methionine amide is disclosed. A mixture of L- and D-methionine nitrile is at least partially converted to a salt of optically active Alpha -phenoxypropionic acid, and the resulting salt is subjected to optical separation by crystallization. The resultant optically active methionine nitrile may be converted into methionine or methionine amide. Optically active methionine or methionine amide is useful as a food and feed supplement.

    Abstract translation: 公开了一种制备光学活性甲硫氨酸，甲硫氨酸腈和甲硫氨酰胺的方法。 至少部分地将L-和D-甲硫氨酸腈的混合物转化为光学活性α-苯氧基丙酸的盐，所得盐通过结晶进行光学分离。 所得光学活性甲硫氨酸腈可以转化成甲硫氨酸或甲硫氨酸酰胺。 光活性甲硫氨酸或甲硫氨酸酰胺可用作食品和饲料添加剂。

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