Process for 2-(1-oxo-3-thiolanyl)-2-penem antibiotics
    6.
    发明授权
    Process for 2-(1-oxo-3-thiolanyl)-2-penem antibiotics 失效
    2-(1-氧代-3-硫杂环丁烷基)-2-青霉烯抗生素的方法

    公开(公告)号:US4870170A

    公开(公告)日:1989-09-26

    申请号:US247141

    申请日:1988-09-21

    IPC分类号: C07D499/88 C07F7/18

    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-acetidinones 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-乙酸丁酯转化为抗菌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。

    Novel process for the preparation of biotin
    7.
    发明授权
    Novel process for the preparation of biotin 失效
    用于制备生物素的新方法

    公开(公告)号:US4772717A

    公开(公告)日:1988-09-20

    申请号:US121367

    申请日:1987-11-16

    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。