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    • 2. 发明申请
    • IMPROVED PROCESS FOR THE PREPARATION OF IBANDRONATE SODIUM
    • 改进IBANDRONATE SODIUM的制备方法
    • WO2007013097A8
    • 2007-12-06
    • PCT/IN2006000251
    • 2006-07-17
    • NATCO PHARMA LTDPULLA 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.
    • 本发明公开了用于制备伊班膦酸或其单钠盐的改进和商业化方法。 根据方法,将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。 将式-X的酸化合物与无色三氯化磷和亚磷酸二膦酰化,随后进行水解,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Ia的伊班膦酸钠单钠为白色结晶固体。 本发明方法使用简单的原料,并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。 伊班膦酸钠的总收率高于式Ⅱ的腈中间体的60%以上。 伊班膦酸盐被广泛用作骨吸收抑制剂。
    • 6. 发明申请
    • AN IMPROVED PROCESS FOR THE PREPARATION OF QUINOLONE DERIVATIVES
    • 改进喹诺酮衍生物的制备方法
    • WO0185692A3
    • 2002-06-06
    • PCT/IN0100042
    • 2001-03-19
    • NATCO PHARMA LTDPULLA REDDY MUDDASANIVENKAIAH CHOWDARY NANNAPANENI
    • PULLA REDDY MUDDASANIVENKAIAH CHOWDARY NANNAPANENI
    • C07C229/34C07D215/56C07C225/16
    • C07C229/34C07C2601/02C07D215/56
    • This invention relates to an improved process for the preparation of quinolone drugs of the formula (I), wherein R=C1-C6 alkyl, C3-C6 cycloalklyl, aryl, substituted aryl, NR R =diarylamino, arylalkylamino, C1-C6-dialkylamino, piprazinyl, N or C alkyl (C1-C6) substituted piperazinyl, morpholino, pyrrolidinyl, substituted pyrrolidinyl, aralkyl, substituted aralkyl etc. Some of the compounds falling within the formula (I) are ciprofloxacin, enrofloxin, pefloxacin, etc. These compounds are useful as antibacterial drugs. The process of the present invention for preparation of compound of formula (I) comprises in enhancing the reactivity of the displaceable halogen (X) in the compound of the formula (II) towards various amines of formula (III) wherein R = as defined for compound of formula (I), R =COOR (R =C1-C6 alkyl, aryl, aralkyl), nitrile a carboxamide (-CONR R , R and R = C1-C6 alkyl, C3-C6 cycloalkyl, aralkyl), X = Cl, Br, F; NR R = as defined above by introducing a nitro group ortho to the displaceable halo group and subsequently removing the nitro group in a conventional manner. The process of the present invention enhances the yield of the compound of the formula (I) and also improves the quality of the prepared compound.
    • 本发明涉及制备式(I)的喹诺酮药物的改进方法,其中R = C 1 -C 6烷基,C 3 -C 6环烷基,芳基,取代的芳基,NR 1 R 2 =二芳基氨基,芳基烷基氨基 C 1 -C 6 - 二烷基氨基,哌嗪基,N或C烷基(C 1 -C 6)取代的哌嗪基,吗啉代,吡咯烷基,取代的吡咯烷基,芳烷基,取代的芳烷基等。属于式(I)的化合物中的一些是环丙沙星,enrofloxin, 这些化合物可用作抗菌药物。 用于制备式(I)化合物的本发明的方法包括提高式(II)化合物中的可置换卤素(X)对式(III)的各种胺的反应性,其中R =如 式(I)化合物,R 3 = COOR 6(R 6 = C 1 -C 6烷基,芳基,芳烷基),腈甲酰胺(-CONR 7 R 8,R 7) 和R 8 = C 1 -C 6烷基,C 3 -C 6环烷基,芳烷基),X = Cl,Br,F; NR 1 R 2 =如上所定义,通过在可置换卤素基团的邻位引入硝基并随后以常规方式除去硝基。 本发明的方法提高了式(I)化合物的产率,并提高了制备的化合物的质量。