What question did this study set out to answer?

This research aims to develop a new method for synthesizing imidazo[1,5-a]pyridines using a solvent-free approach.

May 26, 2026Journal of Heterocyclic Chemistry0 citations

A Solvent‐Free Synthesis of Imidazo1,5‐ a pyridines Using CCl 4 as an Oxidant

ACAlejandro Castillo‐Baltazar LMLuis E. Mendoza‐Herrera ATAlfredo Toscano

Key Points

This research aims to develop a new method for synthesizing imidazo[1,5-a]pyridines using a solvent-free approach.
Used carbon tetrachloride (CCl4) as an oxidant and DBU as a base.
Conducted kinetic analysis via 13C NMR and DFT calculations.
Performed control experiments to propose a reaction pathway.
Achieved good to high product yields for 3-arylimidazo[1,5-a]pyridines.
Observed formation of CHCl3 as a byproduct, indicating CCl4 acts as both a chloride donor and oxidant.

Abstract

ABSTRACT Imidazo1,5‐ a pyridines are intriguing molecules known for their unique biological and photophysical properties, making them valuable in medicinal chemistry. This study reports a solvent‐free approach for synthesizing 3‐arylimidazo1,5‐ a pyridines 1a‐q using carbon tetrachloride as an oxidant reagent and DBU as a base, affording good to high product yields. Based on control experiments, kinetic analysis conducted by 13 C NMR and DFT calculations, we propose a plausible reaction pathway to elucidate this transformation. Moreover, we demonstrate that CCl 4 is a chloride donor and oxidant by observing the formation of CHCl 3 as a byproduct.

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