反应详情

5 g of 2-amino-5-methyl-3-ethoxycarbonylthiophene together with 2.7 g of 3-cyanopyridine are dissolved in 40 ml of dioxane. Then, gaseous HCl is passed through the solution for 5 hours. After customary workup, 6 g of 3,4-dihydro-4-oxo-2-(pyridin-3-yl)-6-methylthieno[2,3-d]pyrimidine are obtained.