- Oxidative Cyclization of 3-(3-Heterocycle-substituted 2-Propenoyl)tropolones
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3-- (2a), 3-- (2b), 3-- (2c), 3-- (2d) were prapared by the condensation of 3-acetyltropolone with the corresponding heterocyclic aldehydes.The compounds 2a-d were oxidized with selenium dioxide to afford 2-heterocycle-substituted cycloheptapyran-4,9-diones, while oxidation with both alkaline hydrogen peroxide and 2,3-dichloro-5,6-dicyano-p-benzoquinone gave 2-(heterocycle-substituted methylene)-2H-cycloheptafuran-3,8-diones.
- Honda, Masaaki,Imafuku, Kimiaki
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