2-(4-Methoxyphenyl)imidazo[1,2-a]pyridine-3-carbaldehyde

This compound is typically obtained as a crystalline solid ranging from yellow to orange. Its molecular formula is C15H12N2O2, corresponding to a molecular weight of 252.27. The melting point generally falls within the range of 178–182 °C. The calculated density is approximately 1.26 g/cm³ under ambient conditions. It exhibits moderate solubility in polar organic solvents such as dimethyl sulfoxide and dimethylformamide, limited solubility in methanol and ethyl acetate, and negligible solubility in water and nonpolar solvents like dichloromethane and hexane. The molecule consists of an imidazo[1,2-a]pyridine core with an aldehyde group at the 3position and a 4methoxyphenyl substituent at the 2position. The aldehyde is susceptible to oxidation and condensation reactions, while the methoxy group provides electrondonating character. Storage in tightly sealed amber containers under inert atmosphere at reduced temperature (2–8 °C) is recommended to prevent decomposition and lightinduced degradation. Contact with strong oxidizing agents and strong bases should be avoided.

2(4Methoxyphenyl)imidazo[1,2a]pyridine3carbaldehyde is a fused heterocyclic compound combining an imidazo[1,2a]pyridine core with an aromatic aldehyde and a methoxyphenyl substituent. The imidazo[1,2a]pyridine scaffold, formed by the fusion of an imidazole ring with a pyridine ring, provides a rigid, nitrogenrich platform capable of engaging in πstacking interactions and hydrogen bonding through its ring nitrogens. The aldehyde group at the 3position serves as an electrophilic handle for further functionalization through reductive amination, condensation, or oxidation reactions. The 4methoxyphenyl substituent at the 2position introduces both electrondonating character and extended conjugation, influencing the photophysical properties and enabling additional πstacking interactions with biological targets. This combination of a privileged heteroaromatic core with modifiable functional groups makes the compound a valuable building block in medicinal chemistry and materials science for constructing molecules with potential biological activity and useful optical properties.

Pharmaceutical Intermediate
In drug discovery, this imidazopyridine aldehyde is employed as a building block for synthesizing compounds with potential activity against cancer and neurological disorders. The aldehyde group enables reductive amination to introduce basic amine side chains or condensation with hydrazines to form hydrazone pharmacophores. The imidazo[1,2a]pyridine core is a privileged scaffold in medicinal chemistry, appearing in various kinase inhibitors and GABA receptor modulators, where it can engage in hydrogen bonding and πstacking interactions with enzyme active sites. The methoxyphenyl group can contribute to hydrophobic interactions and influence metabolic stability.

Fluorescent Probe Development
The extended πconjugation and electrondonating methoxy group confer useful photophysical properties to this compound, making it valuable for designing fluorescent sensors and imaging agents. Derivatives prepared from this scaffold exhibit tunable emission characteristics sensitive to environmental changes such as pH, metal ion concentration, or polarity. These probes are investigated for applications in cellular imaging, metal ion detection, and monitoring biological processes in real time.

Building Block for Heterocyclic Systems
The compound serves as a precursor for constructing more complex fused heterocyclic systems through cyclocondensation reactions at the aldehyde group. Condensation with various dinucleophiles such as hydrazines, amidines, or active methylene compounds yields imidazo[1,2a]pyridine-fused heterocycles with expanded ring systems. These polycyclic structures are investigated for their pharmacological properties and as components of functional materials with enhanced optoelectronic characteristics.

Materials Science Applications
The rigid, planar structure and extended conjugation of this imidazopyridine derivative make it valuable for designing organic semiconductors and lightemitting materials. Incorporation into conjugated polymers or small molecules through functionalization at the aldehyde or methoxyphenyl positions yields materials with tunable band gaps and charge transport properties. These materials are explored for applications in organic lightemitting diodes, fieldeffect transistors, and photovoltaic devices where the imidazopyridine core can facilitate electron transport and light emission.