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A Lactone-Enabled Approach to Metronidazole-Based Scaffolds.

Xiaotan Yu¹, Gisela A González-Montiel¹, Pradip Shit¹

¹Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States.

The Journal of Organic Chemistry

|May 27, 2026

Summary

This summary is machine-generated.

Researchers explored metronidazole derivatives, finding N1-hydroxyethyl nitroimidazole-2-carboxylic acid unstable due to rapid decarboxylation. A stable lactone surrogate was developed for creating novel oxadiazole and amide compounds.

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Area of Science:

Medicinal Chemistry
Organic Synthesis
Computational Chemistry

Background:

Metronidazole is a key antimicrobial agent.
Developing novel metronidazole derivatives is crucial for combating resistance.
Nitroimidazole scaffolds offer diverse synthetic possibilities.

Purpose of the Study:

To develop a scaffold-divergent synthetic approach for metronidazole analogs.
To investigate the stability of N1-hydroxyethyl nitroimidazole-2-carboxylic acid.
To establish a practical route to novel oxadiazole and amide derivatives.

Main Methods:

Scaffold-divergent synthesis of nitroimidazole compounds.
Characterization of N1-hydroxyethyl nitroimidazole-2-carboxylic acid and its derivatives.
Density functional theory (DFT) calculations to probe reaction mechanisms.

Main Results:

N1-hydroxyethyl nitroimidazole-2-carboxylic acid was found to undergo rapid decarboxylation.
A stable lactone (compound 8) was synthesized and validated as a key intermediate.
The lactone enabled efficient access to oxadiazole and amide derivatives.
DFT calculations confirmed a low-barrier decarboxylation pathway for the unstable acid.

Conclusions:

The instability of N1-hydroxyethyl nitroimidazole-2-carboxylic acid is attributed to facile decarboxylation.
A novel lactone intermediate provides a stable and versatile platform for synthesizing diverse metronidazole-based compounds.
This approach expands the synthetic utility of nitroimidazoles for drug discovery.