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    • 79. 发明申请
    • IMPROVED PROCESS FOR THE PREPARATION OF IBANDRONATE SODIUM
    • 改进的IBANDRONATE SODIUM制备方法
    • WO2007013097A1
    • 2007-02-01
    • PCT/IN2006/000251
    • 2006-07-17
    • NATCO PHARMA LIMITEDPULLA REDDY, MuddasaniUSHARANI, VattikutiVENKAIAH CHOWDARY, Nannapaneni
    • PULLA REDDY, MuddasaniUSHARANI, VattikutiVENKAIAH CHOWDARY, Nannapaneni
    • C07F9/38
    • C07F9/3873
    • Present invention discloses an improved and commercial process for the preparation of ibandronic acid or its monosodium salt. According to the process 3-N-methylaminopropionitrile is reacted with n-pentylbromide to get the tertiary amine of formula-II. Hydrolysis of the nitrile compound of formula-II with hydrochloric acid gave the b-alanine derivative of formula-X. Bis-phosphonylation of the acid compound of formula-X with phorphorous trichloride and phosphorous acid, followed by water hydrolysis gave aqueous ibandronic acid. Treatment of this with sodium hydroxide, followed by dilution of the aqueous solution with methanol gave ibandronate monosodium of formula-Ia as white crystalline solid. Present process utilizes simple raw materials and avoids the column chromatography technique used in the prior art process for isolation of ibandronic acid. Overall yield of ibandronate is more than 60% from the nitrile intermediate of formula-II. Ibandronate is widely used as bone resorption inhibitor.
    • 本发明公开了制备伊班膦酸或其单钠盐的改进的和商业的方法。 根据该方法,使3-N-甲基氨基丙腈与正戊基溴反应得到式-II的叔胺。 用盐酸水解式-II的腈化合物,得到式-X的β-丙氨酸衍生物。 用无机三氯化磷和亚磷酸将式-X的酸化合物双膦酰化,然后水解,得到伊班膦酸水溶液。 用氢氧化钠处理,然后用甲醇稀释水溶液,得到式I-a的伊班膦酸一钠,为白色结晶固体。 本发明方法利用简单的原料并且避免了用于分离伊班膦酸的现有技术方法中使用的柱色谱技术。 来自式-II的腈中间体的伊班膦酸盐的总收率超过60%。 伊班膦酸钠广泛用作骨吸收抑制剂。