Studies on the Synthesis of Pyridazine Derivatives. IX. Synthesis of 10H-Pyridazino (3, 2-b) quinazolin-10-one and Its Derivatives. (3)

Abstract

A structual study of so-called dihydrocompound and tetrahydrocompound of 10H-pyridazino (3, 2-b) quinazolin-10-one (VI) was described. These two compounds were assigned to be 3, 4-dihydro- and 1, 2, 3, 4-tetrahydro-10H pyridazino (3, 2-b) quinazolin-10-one (III, IV), respectively. Catalytic hydrogenaytion of VI and III revealed that while the former gave II, III, IV and IX, the later gave II and IX.