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    • 55. 发明授权
    • Cefpodixime proxetil
    • 头孢泊肟酯
    • US07045618B2
    • 2006-05-16
    • US10469330
    • 2002-02-27
    • Yatendra KumarKaptan SinghRakesh Kumar Arora
    • Yatendra KumarKaptan SinghRakesh Kumar Arora
    • C07D501/34
    • C07D501/00
    • The present invention relates to an improved and cost effective process for the industrial manufacture of cefpodoxime proxetil. More specifically, the present invention relates to the preparation of cefpodoxime proxetil of high purity and yield. The process comprises a) dissolving impure cefpodoxime proxetil or adding a solution containing cefpodoxime proxetil into a polar organic solvent or mixture(s) thereof, optionally reducing the solvent by concentration, and adding into a non-polar organic solvent or mixture(s) thereof to precipitate the solid; and b) dissolving the solid obtained from the above step into water-miscible polar organic solvent, optionally reducing the solvent by concentration, adding it into water to obtain the pure cefpodoxime proxetil.
    • 本发明涉及一种改进和成本有效的工业制造头孢泊肟酯的方法。 更具体地,本发明涉及高纯度和产率的头孢泊肟酯的制备。 该方法包括:a)将不纯的头孢泊肟原料溶解或加入含有头孢泊肟酯的极性有机溶剂或其混合物,任选地通过浓缩来还原溶剂,并加入到非极性有机溶剂或其混合物中 沉淀固体; b)将上述步骤得到的固体溶解于水溶性极性有机溶剂中,任选地通过浓缩来还原溶剂,将其加入水中,得到纯头孢泊肟原料。
    • 59. 发明授权
    • Process of lactonization in the preparation of statins
    • 内酯化制备他汀类药物的过程
    • US5939564A
    • 1999-08-17
    • US055572
    • 1998-04-06
    • Yatendra KumarRajesh Kumar ThaperS. M. Dileep KumarJag Mohan Khanna
    • Yatendra KumarRajesh Kumar ThaperS. M. Dileep KumarJag Mohan Khanna
    • C07D309/30
    • C07D309/30
    • A novel process of lactonizaton in the preparation of statins (e.g., the HMG--CoA reductase inhibitors lovastatin and simvastatin) employs very mild reaction conditions. The improved process comprises dissolving the open ring hydroxy acid form of the statins in an organic solvent by heating at a temperature, which ranges from ambient to reflux of the solvent, under anhydrous conditions to produce a solution, treating the solution with a mild catalyst at a temperature from about ambient to 50.degree. C., and adding water to the solution to cause the statins in lactone form to crystalize from the reaction mixture. The mild catalyst used in the reaction is a salt of an organic base with an organic or inorganic acid, such as pyridine hydrobromide, pyridine hydrochloride, or pyridinium, p-toluene sulfonate. The organic solvent comprises a lower alkanol, a non-alcoholic polar solvent, or a mixture of the two.
    • 在制备他汀类药物(例如,HMG-CoA还原酶抑制剂洛伐他汀和辛伐他汀)中的新方法使用非常温和的反应条件。 改进的方法包括通过在无水条件下从环境温度至溶剂回流的温度加热,将开环羟基酸形式的他汀类药物溶解在有机溶剂中,以产生溶液,用温和的催化剂处理溶液 温度为约环境温度至50℃,并向溶液中加入水,使得内酯形式的他汀类从反应混合物中结晶。 反应中使用的温和催化剂是有机碱与有机或无机酸的盐,例如吡啶氢溴酸盐,吡啶盐酸盐或吡啶鎓对甲苯磺酸盐。 有机溶剂包括低级链烷醇,非醇极性溶剂或两者的混合物。