Process for the preparation of a pharmacologically active sulphonylurea derivative
申请人:——
公开号:EP0149592A3
公开(公告)日:1986-06-04
The present invention relates to a method of preparing N-4-[2-(5-methyl-pyrazinyl-2-carboxamido)-ethyl)-benzenesulphonyl}-N'-cyclohexylurea or glipizide, which has the chemical structure (I),
by letting 4-[2-(5-methylpyrazinyl)-2-carboxamido)-ethyl]-benzenesulphonamide with the chemical structure (II), where R1 = NH2, react with N-cyclohexyl trichloroacetamide with the chemical structure (III), where R2 = NHCOCCl3, according to the following reaction scheme:
The reaction is carried out in the presence of a polar, aprotic solvent such as N-methylpyrrolidone (NMP), N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMA) or dimethylsulphoxide (DMSO) under anhydrous conditions in the presence of a base such as an alcoholate, amide or hydride of an alkali metal. The reaction mixture is heated under reflux condensation to 40-100°C and the reaction is going on for 2-5 hours.
本发明涉及一种制备N-4-[2-(5-甲基吡嗪基-2-羧酰胺乙基)-苯磺酰基]-N'-环己基脲或格列吡嗪的方法,其化学结构为(I),通过让化学结构为(II)的4-[2-(5-甲基吡嗪基)-2-羧酰胺乙基]-苯磺酰胺,其中R1= NH2,与化学结构为(III)的N-环己基三氯乙酰胺,其中R2= NHCOCCl3,按照以下反应方案反应:该反应在极性,无质子溶剂如N-甲基吡咯烷酮(NMP),N,N-二甲基甲酰胺(DMF),N,N-二甲基乙酰胺(DMA)或二甲基亚砜(DMSO)的存在下,在无水条件下,在碱金属的醇酸盐,酰胺或氢化物的存在下进行。反应混合物在回流冷凝下加热至40-100°C,反应持续2-5小时。