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Title: Synthesis of some of the antibacterial compounds from 4-hydroxycoumarins: Part II
Authors: Mulwad, V V
Shirodkar, J M
Issue Date: Jun-2002
Publisher: NISCAIR-CSIR, India
Abstract: 4-Hydroxy-2H-2-oxo-3-methylidene-urea[1]benzopyrans 2a-d, 4-hydroxy-2H-2-oxo-3-methylidene-thiourea[1]benzopyrans 2e-h, 4-hydroxy-2H-2-oxo-3-methylidene-guanidine[1]benzopyrans 2i-1 are obtained from la-d on treatment with urea, thiourea, and guanidine respectively in ethanol-acetic acid. Compounds 2a-1 on heating with P2O5 give 1, 2-dihydro-5H-2, 5-dioxo[1]benzopyrano [4,3-d] pyrimidines 3a-d, 1, 2-dihydro-5H-2-thio-5-oxo[1]benzopyrano [4 ,3-d] pyrimidines 3e-h, and 1, 2-dihydro-5H-2-imino-5-oxo[1] benzopyrano [4,3-d] pyrimidines 3i-1. 1H, 4H-4-Oxo-benzopyrano [4 ,3-c] pyrazoles 4a-d, 4H-4-oxo-1-phenyl-benzopyrano[4,3-c]pyrazoles 4e-h, 4H-4-oxo-benzopyrano[3, 4-c]isoxozoles 5a-d, 3-benzamido-2, 5-dioxopyrano [3,2-c]benzopyrans 6a-d and 3-acetamido-2, 5-dioxo-pyrano[3,2-c] benzopyrans 6e-h are obtained by refluxing la-d with hydrazine hydrate, phenyl hydrazine, hydroxylamine hydrochloride, hippuric acid and N-acetyl glycine, respectively in ethanol-acetic acid solution.
Page(s): 1263-1267
ISSN: 0975-0983(Online); 0376-4699(Print)
Appears in Collections:IJC-B Vol.41B(06) [June 2002]

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