Intermediates for 2-(1-oxo-3-thiolanyl)-2-penem antibiotics
    23.
    发明授权
    Intermediates for 2-(1-oxo-3-thiolanyl)-2-penem antibiotics 失效
    2-(1-氧代-3-硫杂环戊烷基)-2-青霉烯抗生素中间体

    公开(公告)号:US4739047A

    公开(公告)日:1988-04-19

    申请号:US877831

    申请日:1986-06-24

    CPC分类号: C07F7/186 C07D499/88

    摘要: Process and intermediates for the conversion of 3R,4R-4-acetoxy-3-[1R-1-(silyloxy)ethyl]-2-azetidinones to antibacterial 5R,6S-6-(1R-1-hydroxyethyl)-2-(1-oxo-3-thiolanylthio)-2-penem-3-carboxylic acids, and the pharmaceutically-acceptable salts and pivaloyloxymethyl esters thereof.

    摘要翻译: 将3R,4R-4-乙酰氧基-3- [1R-1-(甲硅烷氧基)乙基] -2-氮杂环丁酮转化为抗菌5R,6S-6-(1R-1-羟乙基)-2-( 1-氧代-3-硫杂环戊基硫基)-2-青霉烯-3-羧酸,以及其药学上可接受的盐和新戊酰氧基甲基酯。

    Imidazolidinone precursors for the preparation of biotin
    24.
    发明授权
    Imidazolidinone precursors for the preparation of biotin 失效
    用于制备生物素的咪唑啉酮前体

    公开(公告)号:US4694087A

    公开(公告)日:1987-09-15

    申请号:US910116

    申请日:1986-09-22

    摘要: A novel process is described for preparation of biotin comprising preparation of substituted 3H, 5H-imidazo[1,5c]tetrahydro thiazoles by contacting the boron trifluoride adduct of an appropriate thiazoline with the metallic derivative of an ester enolate, reducing the ester, hydrolyzing the thiazolidine moiety and hydrolyzing or oxidizing the resultant compound. Intermediates obtained in the preparation of biotin by the above process and alternate procedures for preparing said intermediates are also presented. A novel process for preparation of d-biotin is also given.

    摘要翻译: 描述了用于制备生物素的新方法,包括通过使合适的噻唑啉的三氟化硼加合物与酯烯醇化物的金属衍生物接触来制备取代的3 H,5H-咪唑并[1,5c]四氢噻唑,还原酯,水解 噻唑烷部分并水解或氧化所得化合物。 还介绍了通过上述方法制备生物素获得的中间体和制备所述中间体的替代方法。 还给出了一种制备d-生物素的新方法。

    Process for the preparation of biotin
    25.
    发明授权
    Process for the preparation of biotin 失效
    生物素制备方法

    公开(公告)号:US4468516A

    公开(公告)日:1984-08-28

    申请号:US379247

    申请日:1982-05-17

    摘要: A novel process is described for preparation of biotin comprising preparation of substituted 3H, 5H-imidazo[1, 5c]tetrahydro thiazoles by contacting the boron trifluoride adduct of an appropriate thiazoline with the metallic derivative of an ester enolate, reducing the ester, hydrolyzing the thiazolidine moiety and hydrolyzing or oxidizing the resultant compound. Intermediates obtained in the preparation of biotin by the above process and alternate procedures for preparing said intermediates are also presented. A novel process for preparation of d-biotin is also given.

    摘要翻译: 描述了用于制备生物素的新方法,其包括通过使适当的噻唑啉的三氟化硼加合物与酯烯醇化物的金属衍生物接触来制备取代的3 H,5 H-咪唑并[1,5c]四氢噻唑,还原酯,水解 噻唑烷部分并水解或氧化所得化合物。 还介绍了通过上述方法制备生物素获得的中间体和制备所述中间体的替代方法。 还给出了一种制备d-生物素的新方法。

    Process for optically active 3-thiolanyl sulfonate esters
    30.
    发明授权
    Process for optically active 3-thiolanyl sulfonate esters 失效
    光学活性3-硫羟基烷基磺酸酯的方法

    公开(公告)号:US4940823A

    公开(公告)日:1990-07-10

    申请号:US467820

    申请日:1990-01-19

    IPC分类号: C07D333/32

    CPC分类号: C07D333/32

    摘要: Intermediates and a stepwise process for the conversion of an alkyl 4-chloro-3R-hydroxybutyrate to optically active compounds of the formula ##STR1## wherein R is (C.sub.1 -C.sub.3) alkyl, phenyl or tolyl. The latter compounds are in turn useful as an intermediate in the preparation of penem antibiotic 5R,6S-6-(1R-hydroxyethyl)-2-(1R-oxo-3S-thiolanylthio)-2-penem-3-carboxylic acid and corresponding pharmaceutically acceptable salts and esters.

    摘要翻译: 中间体和用于将4-氯-3R-羟基丁酸烷基酯转化成式IMA的光学活性化合物的逐步方法,其中R是(C 1 -C 3)烷基,苯基或甲苯基。 后一种化合物又可用作制备penem抗生素5R,6S-6-(1R-羟乙基)-2-(1R-氧代-3S-硫杂环戊烷基硫代)-2-青霉烯-3-羧酸的中间体和 相应的药学上可接受的盐和酯。