The Acylation of <I>bz</I>-Hydroxy- and <I>bz</I>-Methoxy-2,3-dimethylbenzofurans and the Synthesis of Furobenzopyranone Derivatives

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概要

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• The action of acetic acid, phenylacetic acid, or β-phenylpropionic acid and polyphosphoric acid on 5-, 7-, and 6-hydroxy-2,3-dimethylbenzofurans afforded 6-acyl-5-hydroxy-, 6-acyl-7-hydroxy-, and 5-acyl-6-hydroxybenzofurans, some of which were also obtained by the Friedel-Crafts acylation of the corresponding methoxybenzofurans. The hydroxyketones thus obtained were converted to dimethylfuro derivatives of 4-hydroxycoumarins and isoflavones, and 3-benzyl-4-hydroxyfurocoumarins were also prepared by the thermal condensation of the hydroxybenzofurans and diethyl benzylmalonate.

• 公益社団法人 日本化学会の論文

著者

• Oki Nobuo

  Department Of Agricultural Chemitstry Faculty Of Agriculture Tohoku University

• Kawase Yoshiyuki

  Department of Chemistry Faculty of Science, Toyama University

• Oki Nobuo

  Department of Chemistry, Faculty of Literature and Science, Toyama University

• Yamagughi Seiji

  Department of Chemistry, Faculty of Literature and Science, Toyama University

• Okumura Fumiko

  Department of Chemistry, Faculty of Literature and Science, Toyama University

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• A new preparative method of 4-hydroxybenzofuran-2-carboxylic acid derivatives.
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• The synthesis of some dimethylpyranocoumarins and isopropenyldihydrofuranocoumarins.
• The Synthesis of the Benzofuro[2,3-b]benzofuran Derivative
• Acylations of 2,2-dimethyl-2H-chromenes.

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