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Abstract <p>The reaction of 4-[3,5-bis(2,3,5,6-tetrafluorophenyl)-4,5-dihydro-1<i>H</i>-pyrazol-1-yl]benzaldehyde with <i>tert</i>-butyl piperazine-1-carboxylate gave Boc-protected 4-{3,5-bis[2,3,5,6-tetrafluoro-4-(piperazin-1-yl)­phenyl]-4,5-dihydro-1<i>H</i>-pyrazol-1-yl}benzaldehyde. The latter reacted as a donor block with dicyanoisophorone as an acceptor block in butan-1-ol in the presence of morpholine to produce a dipolar dye with Boc-protected piperazine fragments. After removal of the Boc protection by the action of HCl, the resulting bis-piperazinium dihydrochloride was acylated with benzoyl chloride and its branched derivatives to afford new dipolar chromophores.</p>

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4-{3,5-Bis[2,3,5,6-tetrafluoro-4-(piperazin-1-yl)phenyl]-4,5-dihydro-1H-pyrazol-1-yl}benzaldehyde in the Synthesis of New Dendritic Chromophores

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • R. A. Ishchenko,
  • N. A. Orlova,
  • V. V. Shelkovnikov,
  • A. M. Maksimov,
  • N. D. Ryazanov,
  • V. N. Berezhnaya,
  • A. A. Chernonosov

摘要

Abstract

The reaction of 4-[3,5-bis(2,3,5,6-tetrafluorophenyl)-4,5-dihydro-1H-pyrazol-1-yl]benzaldehyde with tert-butyl piperazine-1-carboxylate gave Boc-protected 4-{3,5-bis[2,3,5,6-tetrafluoro-4-(piperazin-1-yl)­phenyl]-4,5-dihydro-1H-pyrazol-1-yl}benzaldehyde. The latter reacted as a donor block with dicyanoisophorone as an acceptor block in butan-1-ol in the presence of morpholine to produce a dipolar dye with Boc-protected piperazine fragments. After removal of the Boc protection by the action of HCl, the resulting bis-piperazinium dihydrochloride was acylated with benzoyl chloride and its branched derivatives to afford new dipolar chromophores.