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    • 6. 发明授权
    • Derivatives of pyrido-benzothiazine with high anti-microbial activity
    • 具有高抗微生物活性的吡啶并苯并噻嗪的衍生物
    • US4668784A
    • 1987-05-26
    • US765154
    • 1985-08-13
    • Giuseppe MascellaniArnaldo FravoliniPatrizia Terni
    • Giuseppe MascellaniArnaldo FravoliniPatrizia Terni
    • A61K31/54A61P31/04C07D277/82C07D279/16C07D513/06C07D513/04
    • C07D513/06C07D277/82C07D279/16
    • Pyrido-benzothiazine compounds having anti-microbial activity are prepared by (a) reacting 3-chloro-4-fluoroaniline with potassium thiocyanate and bromine to produce 2-amino-6-fluoro-7-chlorobenzothiazole, (b) reacting 2-amino-6-fluoro-7-chlorobenzothiazole with sodium hydroxide to produce the disulfide of 2-amino-5-fluoro 6-chlorothiophenol, (c) reacting the disulfide with sodium monochloroacetate to produce 7-fluoro-8-chloro-2H-1,4-benzothiazin-3(4H)-one, (d) reducing 7-fluoro-8-chloro-2H-1,4-benzothiazin-3(4H)-one to produce 7-fluoro-8-chloro-3,4-dihydro-2H-1,4-benzothiazone, (e) reacting 7-fluoro-8-chloro-3,4-dihydro-2-H-1,4-benzothiazone with ethyl ethoxymethylenemalonate and cyclyzing the intermediate formed with polyphosphoric acid to produce ethyl 9-fluoro-10-chloro-7-oxo-2,3-dihydro-7H-pyrido[1,2,3 de] [1,4]-benzothiazine-6-carboxylate and (f) hydrolyizing the ethyl carboxylate to produce the corresponding carboxylic acid.
    • 通过(a)使3-氯-4-氟苯胺与硫氰酸钾和溴反应制备2-氨基-6-氟-7-氯苯并噻唑,(b)使2-氨基-6-氟-7-氯苯并噻唑反应,制备具有抗微生物活性的吡啶并苯并噻嗪化合物, 6-氟-7-氯苯并噻唑与氢氧化钠反应,得到2-氨基-5-氟-6-氯苯硫酚的二硫化物,(c)使二硫化物与一氯乙酸钠反应,生成7-氟-8-氯-2H-1,4 - 苯并噻嗪-3(4H) - 酮,(d)还原7-氟-8-氯-2H-1,4-苯并噻嗪-3(4H) - 酮,得到7-氟-8-氯-3,4- (e)使7-氟-8-氯-3,4-二氢-2H-1,4-苯并噻唑与乙氧基亚甲基丙二酸乙酯反应,并循环形成多磷酸的中间产物 乙基9-氟-10-氯-7-氧代-2,3-二氢-7H-吡啶并[1,2,3-de] [1,4] - 苯并噻嗪-6-羧酸乙酯和(f)将羧酸乙酯水解成 产生相应的羧酸。