The present invention describes an improved process for the preparation, isolation, and purification of the anti-ulcer agent omeprazole whereby the sulfide precursor pyrmetazole is reacted subsurfacely with exactly one molar equivalent of meta-chloroperoxybenzoic acid in a chlorinated aliphatic hydrocarbon or aromatic hydrocarbon solvent, such as methylene chloride or toluene; residual organic solvent is removed from the aqueous layer by vacuum distillation; crude product is obtained by reactive crystallization with an alkyl formate or formic acid solution and seeding; and pure product is isolated by recrystallization in methanol-water containing aqueous NaOH by subsurface addition of aqueous acetic acid to pH 9.0, seeding, filtration, washing, and drying. Omeprazole and compositions of omeprazole containing no chromatographically detectable levels of residual non-alcoholic organic reaction solvent and diminished levels of alcoholic solvent are also described.
本发明描述了一种改进的制备,分离和纯化抗溃疡药物
奥美拉唑的过程。其中,磺化前体
吡尔酮唑在
氯化脂肪烃或芳香族烃溶剂(如
氯甲烷或
甲苯)中与恰好一个摩尔当量的
间氯过氧苯甲酸进行亚表面反应。通过真空蒸馏从
水层中去除残留有机溶剂,通过与烷基
甲酸酯或
甲酸溶液反应结晶并加入种子晶体获得粗品。通过亚表面加入
乙酸水溶液调节pH至9.0,加入种子晶体,过滤,洗涤和干燥,通过在
甲醇-
水中含有NaOH的溶液中再结晶得到纯品。本发明还描述了
奥美拉唑及其组合物,其中不含有色谱检测到的残留非
醇类有机反应溶剂,并且
醇类溶剂的含量降低。