Synthesis of New Substituted 5-amino-8 H -phthalazino[1,2- b ]quinazolin-8-one Derivatives

Abstract

A series of novel substituted 5-amino-8H-phthalazino[1,2-b]quinazolin-8-one derivatives synthesised by condensation of different amines with 5-chloro-8H-phthalazino[1,2-b]quinazolin-8-one, which was prepared from methyl 2-aminobenzoate by condensation with hydrazine hydrate and then cyclisation with a phthalic anhydride in N,N-dimethylacetamide at refluxing condition. The intermediate and target compounds were obtained in good yields and were easily purified by filtration or recrystallisation.