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    • 20. 发明公开
    • NOVEL SYNTHESIS AND CRYSTALLIZATION OF PIPERAZINE RING-CONTAINING COMPOUNDS
    • 克里斯蒂安·冯·皮纳
    • EP1178805A1
    • 2002-02-13
    • EP00923457.6
    • 2000-04-18
    • Teva Pharmaceutical Industries LimitedTeva Pharmaceuticals USA, Inc.Singer, ClaudeLiberman, Anita
    • SINGER, ClaudeLIBERMAN, AnitaFINKELSTEIN, Nina
    • A61K31/55A61P25/24C07D401/04C07D487/12
    • C07D401/04C07D471/14
    • The present invention is directed to methods for the preparation of piperazine ring-containing compounds, particularly mirtazapine. According to the present invention, the mirtazapine intermediate 1-(3-carboxypyridyl-2)-4-methyl-2-phenyl-piperazine is made by hydrolyzing 1-(3-cyanopyridyl-2)-4-methyl-2-phenyl-piperazine with a base where the base is present in a ratio of up to about 12 moles of the base per one mole of 1-(3-cyanopyridyl-2)-4-methyl-2-phenyl-piperazine. The mirtazapine intermediate 1-(3-carboxypyridly-2)-4-methyl-2-phenyl-piperazine may be made by hydrolyzing 1-(3-cyanopyridyl-2)-4-methyl-2-phenyl-piperazine with potassium hydroxide at a temperature of at least about 130 °C. The method of the present invention also includes reacting 2-amino-3-hydroxymethyl pyridine with N-methyl-1-phenyl-2, 2'-iminodiethyl chloride to form 1-(3-hydroxymethylpyridyl-2)-4-methyl-2-phenyl piperazine, and adding sulfuric acid to the 1-(3-hydroxymethylpyridyl-2)-phenyl-4-methylpiperazine to form mirtazapine. The present invention also relates to new processes for recrystallization of mirtazapine form crude mirtazapine.
    • 本发明涉及制备含哌嗪环化合物,特别是米氮平的方法。 根据本发明,米氮平中间体1-(3-羧基吡啶-2)-4-甲基-2-苯基 - 哌嗪是通过水解1-(3-氰基吡啶基-2)-4-甲基-2-苯基 - 哌嗪与碱相比,每1摩尔1-(3-氰基吡啶基-2)-4-甲基-2-苯基 - 哌嗪,碱的含量最多为约12摩尔碱。 米氮平中间体1-(3-羧基吡啶-2)-4-甲基-2-苯基 - 哌嗪可以通过用氢氧化钾水解1-(3-氰基吡啶基-2)-4-甲基-2-苯基 - 哌嗪来制备 温度至少约130℃。本发明的方法还包括使2-氨基-3-羟甲基吡啶与N-甲基-1-苯基-2,2'-亚氨基二乙基氯反应形成1-(3- 羟甲基吡啶-2)-4-甲基-2-苯基哌嗪,并向1-(3-羟甲基吡啶-2) - 苯基-4-甲基哌嗪中加入硫酸以形成米氮平。 本发明还涉及来自粗米氮平的米氮平重结晶的新方法。