The present invention relates to process for isolation of ganciclovir intermediate. The present invention also provides a novel crystalline forms of ganciclovir, processes for their preparation and pharmaceutical composition comprising them. Thus, for example, to a mixture containing N-7 and N-9 isomer was added acetic acid and acetonitrile at 25 to 300C to obtain a mass having a pH of 4.0 to 5.0, the reaction mass was cooled to -5 to -100C and stirred for 3 hours at -5 to -100C, filtered, washed with chilled acetonitrile and dried at 600C for 4 hours to give N2-acetyl-9-(l,3-diacetoxy-2- propoxymethyl) guanine.
本发明涉及一种分离甘昔洛韦中间体的方法。本发明还提供了甘昔洛韦的新晶体形式,以及制备它们的方法和包含它们的药物组合物。例如,向含有N-7和N-9异构体的混合物中加入
乙酸和
乙腈,温度为25至300°C,以获得pH为4.0至5.0的物质,将反应物质冷却至-5至-100°C并在-5至-100°C搅拌3小时,过滤,用冷
乙腈洗涤并在60°C下干燥4小时,得到N2-乙酰基-9-(1,3-
二乙酰氧基-2-丙氧甲基)
鸟嘌呤。