反应详情

12.6 g. 2-(theophyllin-7-yl)-acetamidoxime, 10 g. of ethyl acrylate, 220 cm3 of ethanol and 3.4 g. of sodium ethylate are heated under stirring for 15 hours. 16 g. (95% yield) of raw 7-[[5-(2-ethoxy-ethyl)-1,2,4-oxadiazol-3-yl]-methyl]-theophylline are obtained. This product is heated with 20 cm3 diethylamine under stirring for 8 hours on a 110° C. oil bath. The mixture is then evaporated at reduced pressure, washed by trituration with water and salt is formed with 5.8 g. of maleic acid in hot ethanol. 16.2 g. (68% yield) of 7-[{5-(2-diethylamino-ethan-1-yl)-1,2,4-oxadiazol-3-yl}-methyl]-theophilline-maleinate are are obtained. M.p.: 125°-128° C.