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    • 85. 发明申请
    • PROCESS FOR THE PREPARATION OF HIGH PURITY CITALOPRAM AND ITS PHARMACEUTICALLY ACCEPTABLE SALTS
    • 制备高纯度CITALOPRAM及其药学上可接受的盐的方法
    • WO2004016602A1
    • 2004-02-26
    • PCT/IN2002/000167
    • 2002-08-14
    • NATCO PHARMA LIMITED
    • MUDDASANI, Pulla, ReddyNANNAPANENI, Wenkaiah, Chowoary
    • C07D307/87
    • C07D307/87
    • This invention discloses an improved process for the preparation of high purity citalopram base and its hydrobromide salt of formulae (I) and (Ia): which comprises: i. Isolation of crude citalopram base after water work up of the reaction into a non polar aromatic or dialkyl ether solvent. ii. Extraction of the citalopram base into aqueous organic acid. iii. Neutralization of acid layer with organic base to a controlled pH (7.0-8.0) iv. Extraction of the pure base into a non-polar aromatic or dialkyl ether solvent and crytallization form the same solvent after concentrating to certain volume under reduced pressure. v. Preparation of high purity citalopram hydrobromide in a non-polar aromatic or dialkyl ether solvent using 40-50 % HBr in acetic acid as HBr source and crystallizing out form the same solvent. Alternatively preparation of HBr salt in aqueous medium using aqueous HBr and crystallizing out from the same medium at 0 10 °C. vi. Recrystallization of high purity citalopram hydrobromide salt of pharmaceutically acceptable grade form a mixture of alcoholic solvent.
    • 本发明公开了制备高纯度西酞普兰碱及其式(I)和(Ia)的氢溴酸盐的改进方法:其包括: 在将反应水加工成非极性芳族或二烷基醚溶剂后,分离粗制西酞普兰碱。 II。 将西酞普兰碱提取成含水有机酸。 III。 将酸性有机碱中和至受控pH(7.0-8.0)iv。 将纯碱萃取到非极性芳族或二烷基醚溶剂中,并在减压下浓缩至一定体积后形成相同的溶剂。 v。在非极性芳族或二烷基醚溶剂中使用40-50%HBr在乙酸中作为HBr源制备高纯度西酞普兰氢溴酸盐,并从相同的溶剂中结晶出来。 或者使用HBr水溶液在水性介质中制备HBr盐,并在0°C从相同的介质中析出。 六。 可药用级别的高纯度西酞普兰氢溴酸盐的重结晶形成醇溶剂的混合物。