Ascorbic acid ester
    1.
    发明授权
    Ascorbic acid ester 失效
    抗坏血酸酯

    公开(公告)号:US4845246A

    公开(公告)日:1989-07-04

    申请号:US205094

    申请日:1988-06-10

    IPC分类号: C07H7/06

    CPC分类号: C07H7/06

    摘要: 6-O-(2-keto-L-gulonoyl)-L-ascorbate substantially free from 2-keto-L-gulonic acid is produced by allowing an acid to act on 2-keto-L-gulonic acid in an inert organic solvent and recovering 6-O-(2-keto-L-gulonoyl)-L-ascorbate from the reaction mixture.6-O-(2-keto-L-gulonoyl)-L-ascorbate is more fat-soluble than L-ascorbic acid and is expected of the use as a prodrug for L-ascorbic acid that can be absorbed from the intestinal tract.

    2-Alkyl-4-amino-5-aminomethylpyrimidines
    2.
    发明授权
    2-Alkyl-4-amino-5-aminomethylpyrimidines 失效
    2-烷基-4-氨基-5-氨基甲基嘧啶

    公开(公告)号:US4794182A

    公开(公告)日:1988-12-27

    申请号:US073697

    申请日:1987-07-14

    IPC分类号: C07D239/42

    CPC分类号: C07D239/42

    摘要: A novel 2-lower alkyl-4-amino-5-substituted iminopyrimidine compound represented by the formula: ##STR1## wherein R is a lower alkyl, and Y is hydroxyl or amino which may be protected or a salt thereof is obtainable by allowing a formylpyrimidine compound represented by the formula: ##STR2## wherein R is a lower alkyl to react with a compound represented by the formula H.sub.2 N--Y, wherein Y is hydroxyl or amino which may be protected, or a salts thereof. The iminopyrimidine compound gives the known pyrimidine compound represented by the formula: ##STR3## wherein R is as defined above in high yield. Therefor, the process is very useful as an industrial production method.

    摘要翻译: 由下式表示的新型2-低级烷基-4-氨基-5-取代的亚氨基嘧啶化合物:其中R为低级烷基,Y为可被保护的羟基或氨基或其盐可通过使 由下式表示的甲酰嘧啶化合物:其中R是与式H2N-Y表示的化合物反应的低级烷基,其中Y是可被保护的羟基或氨基,或其盐。 亚氨基嘧啶化合物以高产率得到由下式表示的已知嘧啶化合物:其中R如上定义。 因此,该方法作为工业生产方法是非常有用的。

    Production of L-ascorbic acid
    3.
    发明授权
    Production of L-ascorbic acid 失效
    生产L-抗坏血酸

    公开(公告)号:US5902885A

    公开(公告)日:1999-05-11

    申请号:US2513

    申请日:1993-01-08

    IPC分类号: C07D307/62

    CPC分类号: C07D307/62

    摘要: L-ascorbic acid is produced by allowing an acid to act on 2-keto-L-gulonic acid in a mixture solvent of an inert organic solvent and an aliphatic ketone in the presence of water and a surfactant.The method produces L-ascorbic acid in a high yield 90% or more and is an industrially advantageous method.

    摘要翻译: 通过在水和表面活性剂的存在下,在惰性有机溶剂和脂族酮的混合溶剂中使酸作用于2-酮-L-古洛糖酸来制备L-抗坏血酸。 该方法以高产率生产L-抗坏血酸90%以上,是工业上有利的方法。

    Process for producing vitamin A derivatives
    5.
    发明授权
    Process for producing vitamin A derivatives 失效
    生产维生素A衍生物的方法

    公开(公告)号:US5424478A

    公开(公告)日:1995-06-13

    申请号:US215813

    申请日:1994-03-22

    IPC分类号: C07C69/07 C07C403/12

    CPC分类号: C07C403/12 C07C2101/16

    摘要: The present specification relates to an industrially advantageous process for producing vitamin A derivatives which are useful as medicaments, feed additives, food additives and the like. The process provides vitamin A derivatives, particularly all-trans vitamin A derivatives in high yield and purity.

    摘要翻译: 本说明书涉及可用作药物,饲料添加剂,食品添加剂等的维生素A衍生物的工业上有利的方法。 该方法以高产率和纯度提供维生素A衍生物,特别是全反式维生素A衍生物。

    Thiazole derivatives
    7.
    发明授权
    Thiazole derivatives 失效
    噻唑衍生物

    公开(公告)号:US4695639A

    公开(公告)日:1987-09-22

    申请号:US568921

    申请日:1984-01-06

    摘要: A novel aminothiazoleacetic acid derivative which is an advantageous synthetic intermediate for .beta.-lactam antibiotics, and its production method and use. Starting with diketene, the production method comprises the following squence of steps. ##STR1## (In the above formulas, R is lower alkyl or phenyl; R.sub.1 and R.sub.2 each are hydrogen or lower alkyl; X and X' each are halogen; W is S or SO.sub.2 ; and W' is OH or ##STR2##

    摘要翻译: 一种新颖的氨基噻唑乙酸衍生物,其是β-内酰胺抗生素的有利合成中间体及其制备方法和用途。 从双烯酮开始,生产方法包括以下步骤。 (图像) + TR (在上式中,R为低级烷基或苯基; R 1和R 2各自为氢或低级 烷基; X和X'各自为卤素; W为S或SO 2; W'为OH或“IMAGE”