Synthesis of 3-(alkylamino and anilino)-4-benzyloxycarbonyl-1H-pyrrole-2,5-diones via 5-[(alkylamino and anilino)(cyano)]-2,2-dimethyl-1,3-dioxane-4,6-diones

Treatment of [(alkylamino and anilino)(cyano)methylene]-2,2-dimethyl-1,3-dioxane-4,6-diones with benzyl alcohol for 20 min at reflux gave 3-(alkylamino and anilino)-4-benzyloxycarbonylmaleimides.