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A Three-Step Route to Functionalized Pyrrole-2,5-Dicarboxylic Acids from Galactaric Acid.

Giacomo Trapasso1, Davide Dalla Torre1, Marco Artuso1

  • 1Ca' Foscari University of Venice, Department of Environmental Sciences, Informatics and Statistics, Mestre, Italy.

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|April 22, 2026
PubMed
Summary

This study presents a simple, three-step synthesis for N-substituted pyrrole-2,5-dicarboxylic acids (PDCAs) from galactaric acid (GalA). The developed method offers high yields and avoids chromatographic purification, making it a greener alternative for producing valuable chemical compounds.

Keywords:
aldaric acidsbiomass valorizationgalactaric acidgreen metricspyrrole

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Area of Science:

  • Organic Chemistry
  • Green Chemistry
  • Biomass Valorization

Background:

  • Galactaric acid (GalA) is a biomass-derived organic acid with potential for synthesizing platform chemicals.
  • Pyrrole-2,5-dicarboxylic acids (PDCAs) are nitrogen-containing heterocycles with applications in polymers and MOFs.
  • Existing methods for N-substituted PDCA (R-PDCA) synthesis are lengthy and inefficient.

Purpose of the Study:

  • To develop a simple, scalable, and high-yield synthetic route for functionalized PDCA derivatives from GalA.
  • To establish a greener and more efficient alternative to existing R-PDCA synthesis procedures.

Main Methods:

  • A three-step synthetic process was optimized starting from GalA.
  • A 2-pyrone salt intermediate was utilized in the synthesis.
  • Products were isolated and characterized without chromatographic purification.

Main Results:

  • A library of PDCA derivatives was produced in high yields.
  • The synthesis was achieved in only three steps.
  • The greenness of the process was evaluated and compared favorably to previous methods.

Conclusions:

  • The developed three-step procedure provides a viable and efficient method for synthesizing N-substituted PDCA compounds from GalA.
  • This approach offers a greener alternative for producing valuable heterocycles from biomass.
  • The method's simplicity and scalability make it suitable for broader applications.