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<p>A new natural deep eutectic solvent (DES) based on arginine (ARG) and glutaric acid (GLU) was prepared. The eutectic point phase diagram showed that the best ratio for preparation of ARG/GLU-DES is one mole of ARG to three moles of GLU. Then, the new DES was characterized by eutectic points, FT-IR, <sup>1</sup>H NMR, TGA/DTA, and densitometry techniques. Additionally, it was demonstrated to be an effective catalyst for the green synthesis of pyrano[2,3-<i>d</i>]-pyrimidines through a one-pot three-component condensation reaction of aromatic aldehydes, barbituric acid, and 4-hydroxycoumarin at 80&#xa0;°C under solvent-free conditions with high yields and short reaction times.</p>

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Preparation of arginine-glutaric acid-based-deep eutectic solvent and its application as a potent catalyst for the synthesis of pyranopyrimidines

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  • 发表日期：

    2025年10月14日

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  • Afagh Ranjbaran,
  • Davood Habibi,
  • Arezo Monem,
  • Nastaran Dehnokhalaji

摘要

A new natural deep eutectic solvent (DES) based on arginine (ARG) and glutaric acid (GLU) was prepared. The eutectic point phase diagram showed that the best ratio for preparation of ARG/GLU-DES is one mole of ARG to three moles of GLU. Then, the new DES was characterized by eutectic points, FT-IR, 1H NMR, TGA/DTA, and densitometry techniques. Additionally, it was demonstrated to be an effective catalyst for the green synthesis of pyrano[2,3-d]-pyrimidines through a one-pot three-component condensation reaction of aromatic aldehydes, barbituric acid, and 4-hydroxycoumarin at 80 °C under solvent-free conditions with high yields and short reaction times.