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Abstract <p>The reaction of potassium <i>m</i>- and <i>p</i>-aminobenzoates with 3,9-bis(bromomethyl)-2,4,8,10-tetraoxa­spiro[5.5]undecane at a molar ratio of 2:1 gave 2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diylbis(methylene) bis(3- and 4-aminobenzoates). The latter reacted with 2 equiv of maleic anhydride to produce the corresponding bis-maleamic acids whose intramolecular cyclization in the presence of <i>p</i>-toluenesulfonic acid afforded previously unknown 2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diylbis(methylene) bis[3- and 4-(2,5-dioxo-2,5-dihydro-1<i>H</i>-pyrrol-1-yl)benzoates].</p>

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Synthesis of 2,4,8,10-Tetraoxaspiro[5.5]undecane-3,9-diylbis(methylene) Bis[3- or 4-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)benzoates]

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • O. A. Kolyamshin,
  • Yu. N. Mitrasov,
  • V. A. Danilov,
  • Yu. Yu. Pylchikova

摘要

Abstract

The reaction of potassium m- and p-aminobenzoates with 3,9-bis(bromomethyl)-2,4,8,10-tetraoxa­spiro[5.5]undecane at a molar ratio of 2:1 gave 2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diylbis(methylene) bis(3- and 4-aminobenzoates). The latter reacted with 2 equiv of maleic anhydride to produce the corresponding bis-maleamic acids whose intramolecular cyclization in the presence of p-toluenesulfonic acid afforded previously unknown 2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diylbis(methylene) bis[3- and 4-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)benzoates].