Oxidative cyclization of 3-(3-heterocycle-substituted 2-propenoyl)tropolones.
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概要
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3-[3-(2-Furyl)-2-propenoyl]- (<B>2a</B>), 3-[3-(2-thienyl)-2-propenoyl]- (<B>2b</B>), 3-[3-(3-thienyl)-2-propenoyl]- (<B>2c</B>), and 3-[3-(3-pyridyl)-2-propenoyl]tropolone (<B>2d</B>) were prepared by the condensation of 3-acetyltropolone with the corresponding heterocyclic aldehydes. The compounds <B>2a–d</B> were oxidized with selenium dioxide to afford 2-heterocycle-substituted cyclohepta[<I>b</I>]pyran-4,9-diones, while oxidation with both alkaline hydrogen peroxide and 2,3-dichloro-5,6-dicyano-<I>p</I>-benzoquinone gave 2-(heterocycle-substituted methylene)-2<I>H</I>-cyclohepta[<I>b</I>]furan-3,8-diones.
- 公益社団法人 日本化学会の論文
著者
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IMAFUKU Kimiaki
Department of Chemistry, Faculty of Science, Kumamoto University
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Honda Masaaki
Department of Chemistry, Faculty of Science, Kumamoto University
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