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Title: New heterocyclic derivatives of 3-formyl-4-hydroxycoumarin
Authors: Siddiqui, Zeba N
Asad, Mohammad
Keywords: 3-Formyl-4-hydroxycoumarin;3-acetoacetylpyrano[3,2-c][1]benzopyran-2,5-dione;pyranopyra zoles;isoxazole;7-(4-hydroxycoumarin-3-yl)-10,10-dimethyl-8-oxo-8,9,10,11-tetrahydropyran [3,2-c] coumarin
Issue Date: Dec-2006
Publisher: CSIR
IPC Code: Int.Cl.8 C07D
Abstract: Condensation of 4-hydroxy-2-oxo-2H-[1]benzopyran-3-carboxaldehyde 1 with triacetic acid lactone 2, 5, 5-dimethylcyclohexan-1,3-dione 5 and 3-methyl-1-phenyl-5-pyrazolone 7 in refluxing ethanol affords 3-acetoacetyl¬≠pyrano[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, 1H NMR and mass spectral data.
Page(s): 2704-2709
ISSN: 0975-0983(Online); 0376-4699(Print)
Appears in Collections:IJC-B Vol.45B(12) December 2006]

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