Abstract
Condensation of 4-hydroxy-2-oxo-2H-[1]benzopyran-3-carboxaldehyde 1 with triacetic acid lactone 2, 5, 5dimethylcyclohexan-1,3-dione 5 and 3-methyl-1-phenyl-5-pyrazolone 7 in refluxing ethanol affords 3-acetoacetylpyrano [3,2-c] [1] benzopyran-2,5 -dione 3, 7-(4-hydroxycoumarin-3-yl)-10,10-dimethyl-8-oxo-8,9, 10,11-tetrahydropyrano [3,2-c] coumarin 6 and methylidine-bis-4,4' -[3-methyl-5-oxo-1-phenylpyrazole] 9. Pyrazoles 4a,b and isoxazole 4c are obtained by treatment of 3 in acetic acid with hydrazine, phenylhydrazine and hydroxylamine. Structures of all these compounds have been established by IR, H-1 NMR and mass spectral data.