19-Jun-2013
11:09:43 IST
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NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
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Research Journals >
Indian Journal of Chemistry -Section B (IJC-B) >
IJC-B Vol.45B [2006] >
IJC-B Vol.45B(12) December 2006] >
| 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-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, 1H NMR and mass spectral data. |
| Page(s): | 2704-2709 |
| ISSN: | 0975-0983(Online); 0376-4699(Print) |
| Source: | IJC-B Vol.45B(12) December 2006]
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