Reaction of hydroxycoumarins and its analogues

Authors
Mulwad, VV Hegde, AS Suryanarayan, V
Citation
Vv. Mulwad et al., Reaction of hydroxycoumarins and its analogues, I J CHEM B, 38(2), 1999, pp. 148-151
Citations number
15
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
INDIAN JOURNAL OF CHEMISTRY SECTION B-ORGANIC CHEMISTRY INCLUDING MEDICINAL CHEMISTRY
ISSN journal
03764699 → ACNP
Volume
38
Issue
2
Year of publication
1999
Pages
148 - 151
Database
ISI
SICI code
0376-4699(199902)38:2<148:ROHAIA>2.0.ZU;2-6
Abstract
4-Hydroxycoumarins, thiocoumarins, 4-hydroxy-2-quinolones when condensed wi th ethyl 2,3-dihydro-3-oxo-benzofuran-2-carboxylate afford the correspondin g 6H,12H-benzofuro[2',3';4,5]pyrano[3,2-c]benzopyran-6,12-diones 3a-e, 6H, 12H-benzofuro[2',3 ';4,5]pyrano[3,2-c]thiobenzopyran-6,12-dione 3f, 6H,12H- benzofuropyrano[3,2-c]quinoline-6,12-diones 4a-k respectively. 6-Ethyl-7-hy droxy-4-methylcoumarin on condensation with ethyl 2,3-dihydro-3-oxo-benzofu ran-2-carboxylate yields 2H,8H-benzofuro[2',3';3,4]-pyrano[2,3-h] benzopyra n-2,8-dione 5.