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Title: New heterocyclic derivatives of 3-formyl-4-hydroxycoumarin
Authors: Siddiqui, Zeba N
Asad, Mohammad
Keywords: 3-Formyl-4-hydroxycoumarin
pyranopyra zoles
7-(4-hydroxycoumarin-3-yl)-10,10-dimethyl-8-oxo-8,9,10,11-tetrahydropyran [3,2<i>-c</i>] coumarin
Issue Date: Dec-2006
Publisher: CSIR
Series/Report no.: Int.Cl.<sup>8</sup> C07D<b style=""></b>
Abstract: Condensation of 4-hydroxy-2-oxo-2<i style="">H</i>-[1]benzopyran-3-carboxaldehyde <b style="">1</b> with triacetic acid lactone <b style="">2, </b>5, 5-dimethylcyclohexan-1,3-dione <b style="">5</b> and 3-methyl-1-phenyl-5-pyrazolone <b style="">7</b> in refluxing ethanol affords 3-acetoacetyl¬≠pyrano[3,2<i>-c</i>][1]benzopyran-2,5-dione <b style="">3</b>, 7-(4-hydroxycoumarin-3-yl)-10,10-dimethyl-8-oxo-8,9, 10,11-tetrahydropyrano [3,2<i>-c</i>] coumarin <b style="">6</b> and methylidine-bis-4,4' -[3-methyl-5-oxo-1-phenylpyrazole] <b style="">9</b>. Pyrazoles <b style="">4a</b>,<b style="">b</b> and isoxazole <b style="">4c</b> are obtained by treatment of <b style="">3</b> in acetic acid with hydrazine, phenylhydrazine and hydroxylamine. Structures of all these compounds have been established by IR, <sup>1</sup>H NMR and mass spectral data.
Description: 2704-2709
ISSN: 0975-0983(Online); 0376-4699(Print)
Appears in Collections:IJC-B Vol.45B(12) December 2006]

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