4-Methyl-1,8-naphthyridin-2-ol

This compound is typically obtained as a crystalline solid ranging from off-white to pale yellow. Its molecular formula is C9H8N2O, corresponding to a molecular weight of 160.17. The melting point generally exceeds 220 ℃, often with decomposition observed upon prolonged heating. The calculated density is approximately 1.31 g/cm³ under ambient conditions. It exhibits limited solubility in common organic solvents such as methanol and dichloromethane, but dissolves more readily in polar aprotic solvents like dimethyl sulfoxide and dimethylformamide. The compound is sparingly soluble in water and practically insoluble in non-polar solvents such as hexane. The molecule contains a 1,8-naphthyridine core with a methyl group at the 4-position and a hydroxyl at the 2-position, which exists predominantly in the keto form under physiological conditions. The ring nitrogen atoms provide hydrogen bond accepting capability, while the hydroxyl/oxo group offers additional hydrogen bonding potential. Storage in tightly sealed containers protected from light and moisture at ambient temperature is generally adequate, though desiccated conditions are recommended for prolonged storage. Contact with strong oxidizing agents and strong bases should be avoided.

4-Methyl-1,8-naphthyridin-2-ol is a fused heterocyclic compound belonging to the naphthyridine family, featuring a bicyclic ring system where two pyridine rings are fused together. The 1,8-naphthyridine core provides a rigid, planar scaffold with multiple nitrogen atoms capable of engaging in hydrogen bonding and metal coordination. The hydroxyl group at the 2-position exists in tautomeric equilibrium with the corresponding 2-oxo form, influencing both the electronic distribution and the hydrogen bonding capacity of the molecule. The methyl substituent at the 4-position contributes hydrophobic character and steric influence, modulating the overall lipophilicity and binding interactions. This combination of a nitrogen-rich heteroaromatic core with an alkyl substituent and a tautomerizable hydroxyl group makes the compound a valuable building block in medicinal chemistry and materials science, where the naphthyridine scaffold can serve as a bioisostere for quinoline or other nitrogen heterocycles and participate in specific recognition events with biological targets.

This naphthyridine derivative is employed in the synthesis of compounds with potential activity against bacterial infections and cancer. The 1,8-naphthyridine core is a privileged scaffold in medicinal chemistry, appearing in various antibiotics and antitumor agents where it can intercalate into DNA or inhibit key enzymes such as topoisomerases and kinases. The hydroxyl group enables further derivatization through etherification or esterification, while the methyl group can modulate metabolic stability and binding affinity.

The compound serves as a precursor for constructing fused heterocyclic systems through further annulation reactions. The nitrogen atoms can direct metalation or participate in cyclocondensation reactions to access polycyclic structures with enhanced pharmacological properties. These ring systems are investigated for their potential as selective enzyme inhibitors and as probes for studying nucleic acid interactions.

The arrangement of nitrogen atoms in the 1,8-naphthyridine core creates a potential chelation site for metal ions, particularly transition metals. Metal complexes derived from this scaffold are studied for their catalytic activity and as models for metalloenzyme active sites. The methyl and hydroxyl substituents can influence the electronic properties of the metal center, enabling fine-tuning of reactivity in catalytic applications.

The rigid, planar structure and extended π-conjugation of the naphthyridine core make this compound valuable for designing organic semiconductors and fluorescent materials. Incorporation into conjugated polymers or coordination polymers yields materials with tunable optoelectronic properties for applications in organic light-emitting diodes, field-effect transistors, and chemical sensors. The ability to coordinate metals also enables the construction of metal-organic frameworks with defined porosity for gas storage and separation.

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