Ethyl 2-(2-acetyl-2-ethoxycarbonyl-1-ethenyl)amino-3dimethylaminopropenoate was prepared from ethyl n-(2-acetyl-2-ethoxycarbonyl-1-ethenyl)-glycyanate andN,N-dimethylformamide dimethyl acetal, and use as a reagent for preparaton of substituted amino azolo- and azinopyrimidin-4-ones, quionlizin-4-ones, 2H-1-benzopyran-2-ones, and isomeric napthopyranones, 2H-pyrano[2,1-b]pyridine-2,5-dione, pyrano[4,5-b]-pyran-2,5-dione and pyrano[3,2-c]bezopyran-2,5-dione.