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。