Hydrogenation catalyst useful in the production of
alpha-6-deoxytetracyclines
    5.
    发明授权
    Hydrogenation catalyst useful in the production of alpha-6-deoxytetracyclines 失效
    用于生产α-6-脱氧四环素的氢化催化剂

    公开(公告)号:US4987242A

    公开(公告)日:1991-01-22

    申请号:US443586

    申请日:1989-11-29

    Abstract: A coordination compound useful as a hydrogenation catalyst, having the formula: ##STR1## wherein Ph is phenyl; R is hydrogen or C.sub.1 -C.sub.4 alkyl; and X is chloro, bromo or iodo. This compound is particularly useful as a homogeneous hydrogenation catalyst in the production of alpha-6-deoxytetracyclines, particularly the antibiotic doxycycline. The desired alpha-6-deoxy product is produced in high yields and stereospecificities, the process requiring the use of minimal quantities of rhodium metal in the hydrogenation catalyst per mole of the 6-methylenetetracycline hydrogenated.

    Abstract translation: 可用作氢化催化剂的配位化合物,具有下式:其中Ph是苯基; R是氢或C 1 -C 4烷基; X是氯,溴或碘。 该化合物特别可用作生产α-6-脱氧四环素,特别是抗生素多西环素的均相加氢催化剂。 所需的α-6-脱氧产物以高产率和立体定向性产生,该方法需要在加氢催化剂中使用最少量的铑金属,每摩尔加氢的6-亚甲基四环素。

    Process for producing 7-dimethylamino-6-demethyl-6-deoxytetracycline
    6.
    发明授权
    Process for producing 7-dimethylamino-6-demethyl-6-deoxytetracycline 失效
    7-二甲基氨基-6-脱甲基-6-脱氧四环素的制备方法

    公开(公告)号:US4918208A

    公开(公告)日:1990-04-17

    申请号:US222886

    申请日:1988-07-22

    CPC classification number: C07C231/22 C07C237/26 C07C2103/46

    Abstract: A process for producing 7-dimethylamino-6-demethyl-6-deoxytetracycline (minocycline) which comprises treating the reaction liquid containing minocycline and formaldehyde with hydroxylamine or urea, the reaction liquid being obtained after reductive methylation of 7-amino-6-demethyl-6-deoxytetracycline by using aldehyde, then subjecting the reaction liquid to an adsorption treatment with a nonionic adsorption resin (adsorbent), and subsequently eluting the intended product adsorbed to the adsorbent.

    Abstract translation: 一种7-二甲基氨基-6-脱氧四环素(二甲胺四环素)的制备方法,其包括用羟胺或尿素处理含有二甲胺四环素和甲醛的反应液体,所述反应液是在还原甲基化7-氨基-6-去甲基 - 通过使用醛,然后用非离子吸附树脂(吸附剂)对反应液进行吸附处理,随后洗脱吸附在吸附剂上的预期产物。

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