3-Hydroxy-ϒ-pyrone 2位の直接アルキル化

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  • Direct Alkylation of 3-Hydroxy-ϒ-pyrone at the 2-Position
  • 3-Hydroxy-ガンマ-pyrone2イ ノ チョクセツ アルキルカ Maltol オヨビ ソノ カンレン カゴウブツ ノ ゴウセイ 2

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The method described in literature for alkylating 3-hydroxy-ϒ-pyrone (pyromeconic acid) at the 2-position consists of the reduction of the hydroxylic intermediates or the Mannich base which were derived from the reaction with aldehydes.<br> The application of this method is limited, for example, the introduction of isopropyl or phenyl groups by this means is impossible.<br> The present authors have developed a novel method for direct alkylation of pyromeconic acid at the 2-position by refluxing the glacial acetic acid solution of pyromeconic acid in the presence of diacyl peroxides or aroyl peroxides.<br> A radical mechanism seems to be operative in the present reaction.

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