Synthesis of Coumarin Derivatives from 4-Oxo-4H-1-benzopyran-3-carboxaldehyde via 3-(Arylaminomethylene)chroman-2,4-dione
โ Scribed by Chandrakanta Bandyopadhyay; Kumar Ranabir Sur; Ranjan Patra; Arunabha Sen
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- French
- Weight
- 114 KB
- Volume
- 56
- Category
- Article
- ISSN
- 0040-4020
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
The chromone fmfn s 1 and benzonitrile oxide reacted regioapaciffcally to yield 6 1 -172,4 oxadiarolinyl chromonea 2\_in good yields. Also the preparation of a novel dipole & derived from f-formylchromons and its cycloaddition reactions with a variety of alkenes which gave pyrazolinyl chromones zia
Methyl 2-(4-hydroxybutyl)-4-oxo-4~-1-benzopyran-3-carboxylate 6 1s transformed mto the sproacetals 13 and 14 (ratio 5 1) vw treatment with mdomethane&otassmm carbonate, the process mvolvmg sequenaal mtramolecular conjugate addmon and enolate alkylafion The 2,3-epoxlde 7 derived from 6 undergoes spuw