Reduction of 2,5-diketogluconic acid
    65.
    发明授权
    Reduction of 2,5-diketogluconic acid 失效
    还原2,5-二酮葡萄糖酸

    公开(公告)号:US4337350A

    公开(公告)日:1982-06-29

    申请号:US143585

    申请日:1980-04-25

    申请人: Glenn C. Andrews

    发明人: Glenn C. Andrews

    摘要: The novel stereoselective and regioselective alkali metal borohydride reduction of 2,5-diketogluconic acid, alkyl esters or salts thereof to form 2-ketogulonic acid together with lesser amounts of 2-ketogluconic acid is disclosed. The 2-ketogulonic acid is readily converted to ascorbic acid.

    摘要翻译: 公开了2,5-二酮葡萄糖酸,其烷基酯或其盐与更少量的2-酮基葡萄糖酸一起形成2-酮基古洛糖酸的新型立体选择性和区域选择性碱金属硼氢化物还原。 2-酮基古洛糖容易转化为抗坏血酸。

    2,5-Diketogluconic acid esters
    68.
    发明授权
    2,5-Diketogluconic acid esters 失效
    2,5-二酮葡萄糖酸酯

    公开(公告)号:US4230880A

    公开(公告)日:1980-10-28

    申请号:US12683

    申请日:1979-02-16

    申请人: Glenn C. Andrews

    发明人: Glenn C. Andrews

    摘要: The novel stereoselective and regioselective alkali metal borohydride reduction of 2,5-diketogluconic acid, alkyl esters or salts thereof to form 2-ketogluconic acid together with lesser amounts of 2-ketogluconic acid is disclosed. The 2-ketogluconic acid is readily converted to ascorbic acid.

    摘要翻译: 公开了2,5-二酮葡萄糖酸,其烷基酯或其盐与较少量的2-酮基葡萄糖酸一起形成2-酮基葡萄糖酸的新立体选择性和区域选择性碱金属硼氢化物还原。 2-酮葡萄糖酸容易转化为抗坏血酸。

    Ascorbic acid synthesis
    69.
    发明授权
    Ascorbic acid synthesis 失效
    抗坏血酸合成

    公开(公告)号:US4111958A

    公开(公告)日:1978-09-05

    申请号:US803020

    申请日:1977-06-03

    摘要: Ascorbic acid is prepared from a 1,4-lactone selected from gulono-1,4-lactone, galactono-1,4-lactone, idono-1,4-lactone and talono-1,4-lactone by a process comprising protection of the hydroxyl groups of the lactone so as to form an intermediate having a free hydroxyl group at either, but not both, the 2- or 3-position, oxidizing this free hydroxyl group to a keto group and hydrolyzing the oxidized intermediate to remove the hydroxyl-protecting groups.

    摘要翻译: {PG,1抗坏血酸由选自gulono-1,4-内酯,半乳糖-1,4-内酯,idono-1,4-内酯和talono-1,4-内酯的1,4-内酯由 方法包括保护内酯的羟基,以便在2-或3-位的任一个但不是二者形成游离羟基的中间体,将该游离羟基氧化成酮基并水解氧化的中间体 以除去羟基保护基团。

    Process for producing 2-keto-L-gulonic acid
    70.
    发明授权
    Process for producing 2-keto-L-gulonic acid 失效
    2-酮-L-古洛糖酸的制备方法

    公开(公告)号:US3922194A

    公开(公告)日:1975-11-25

    申请号:US45265674

    申请日:1974-03-19

    申请人: SHIONOGI & CO

    摘要: 2-Keto-L-gulonic acid is prepared from 2,5-diketo-D-gluconic acid through microbial conversion. The 2-keto-L-gulonic acid producing microorganism used for this microbial conversion includes strains which belong to genera of Brevibacterium, Arthrobacter, Micrococcus, Staphylococcus, Pseudomonas and Bacillus. Both the incubation of the microorganism in a medium containing 2,5-diketo-L-gluconic acid and the direct contact of any products obtained from the cells with a substrate containing said 2,5-diketo-D-gluconic acid may be used in the disclosed process.

    摘要翻译: 2-酮-L-古洛糖酸通过微生物转化由2,5-二酮-D-葡萄糖酸制备。 用于该微生物转化的2-酮-L-古洛糖酸生产微生物包括属于短杆菌属,节杆菌属,微球菌属,葡萄球菌属,假单胞菌属和芽孢杆菌属的菌株。 在含有2,5-diketo-L-葡萄糖酸的培养基中培养微生物和将从细胞获得的任何产物与含有所述2,5-二酮-D-葡萄糖酸的底物直接接触可以用于 所公开的过程。