Abstract
The reaction of N-(1, 2-bisethoxycarbonylvinyl)-o-aminoacetophenone (IVc) with an excess of hydrazines or guanidines gave 4-hydroxy-1-oxo-1, 2-dihydropyridazino [4, 5-b]-quinolines (Ia, b) or 1, 3-dioxo-1, 3-dihydropyrrolo [3, 4-b] quinolines (IIIc, d), respectively. It was found that 2, 3-bishydrazinocarbonyl-4-methylquinolines (VIa, b) were converted to 4-hydroxy-1-oxo-1, 2-dihydropyridazino [4, 5-b] quinolines (Ia, b) and 1, 3-dioxo-1, 3-dihydropyrrolo [3, 4-b] quinolines (IIIa, b) under different reaction conditions.
