Process for preparing a 1,4-dihydropyridine derivative
    1.
    发明授权
    Process for preparing a 1,4-dihydropyridine derivative 失效
    1,4-二氢吡啶衍生物的制备方法

    公开(公告)号:US4467093A

    公开(公告)日:1984-08-21

    申请号:US402487

    申请日:1982-07-27

    CPC分类号: C07D211/90

    摘要: In the process for preparing 4-(2'-nitrophenyl-2,6-dimethyl)-3,5-dicarbmethoxy-1,4-dihydropyridine of the formula ##STR1## 2-nitrobenzaldehyd-diacetate, methyl acetoacetate and ammonia are reacted in the presence of an inert organic solvent, such as methanol, and in the presence or absence of an organic base, such as pyridine, at a temperature of between 20.degree. and 150.degree. C. The compound is a valuable medicine for the treatment of angina pectoris.

    摘要翻译: 在制备下式的4-(2'-硝基苯基-2,6-二甲基)-3,5-二甲氧基-1,4-二氢吡啶的方法中,将2-乙酰乙酸甲酯和氨反应在 在惰性有机溶剂如甲醇的存在下,在有机碱如吡啶存在或不存在的情况下,温度为20-150℃。该化合物是用于治疗心绞痛的有价值的药物 胸腺

    Process for the preparation of ceftriaxon disodium salt hemiheptahydrate
    4.
    发明授权
    Process for the preparation of ceftriaxon disodium salt hemiheptahydrate 失效
    头孢曲松二钠盐半水合物的制备方法

    公开(公告)号:US5527906A

    公开(公告)日:1996-06-18

    申请号:US9957

    申请日:1993-01-27

    CPC分类号: C07D501/00

    摘要: A new and improved process for the preparation of ceftriaxon disodium salt hemiheptahydrate of formula I ##STR1## is described, wherein 7-amino-3-{[(2,5-dihydro-6-hydroxy-2-methyl-5-oxo-as-triazin-3-yl)thio]methyl}-3-cephem-4-carboxylic acid disodium salt is converted with a reactive 2-(2-aminothiazol-4-yl)-2-syn-metoxyimino acetic acid derivative such as 2-benzo-thiazolyl-thio ester in a water solution and in the presence of a suitable inert organic solvent such as acetone, at a temperature between 0.degree. C. and 40.degree. C. and then the desired compound is isolated in a very pure form and with a high total yield.Ceftriaxon is a cephalosporin antibiotic of the third generation for parenteral application and a valuable agent for the treatment of heavy infections.

    摘要翻译: 描述了制备式I的头孢曲松二钠盐半水合物的新的和改进的方法,其中7-氨基-3 - {[(2,5-二氢-6-羟基-2-甲基 - 5-氧代 - 三嗪-3-基)硫]甲基} -3-头孢烯-4-羧酸二钠盐用反应性2-(2-氨基噻唑-4-基)-2-顺式 - 乙氧基亚氨基乙酸 酸衍生物如2-苯并噻唑基 - 硫代酯在水溶液中,在合适的惰性有机溶剂如丙酮存在下,在0℃至40℃之间,然后分离所需化合物 以非常纯净的形式和高的总产量。 头孢曲松是第三代用于肠胃外应用的头孢菌素抗生素和用于治疗重度感染的有价值的药剂。