An improved process of synthesis of 5-methoxy-2-[(4-methoxy-3,5-dimethyl-2-pyridyl)methyl]sulfinyl-
1
H-benzimidazole (omeprazole) by oxidation of 5-methoxy-2[[(4-methoxy-3,5-dimethyl-2-pyridyl)methyl]thio]benzimidazole with 3-chloroperoxybenzoic acid in ethyl acetate wherein omeprazole is poorly soluble, at a temperature between −10° C. and 5° C. is disclosed. The second step is a purification of the crude product by dissolution and reprecipitation of the final product.
本发明公开了一种改进的合成5-甲氧基-2-[(4-甲氧基-3,5-二甲基-2-
吡啶基)甲基]亚磺酰-1H-
苯并咪唑(
奥美拉唑)的过程,通过在
乙酸乙酯中将5-甲氧基-2-[(4-甲氧基-3,5-二甲基-2-
吡啶基)
硫基]
苯并咪唑氧化为3-
氯过氧
苯甲酸,其中
奥美拉唑溶解度较差,温度在-10℃至5℃之间。第二步是通过溶解和重新沉淀最终产物来纯化粗品。