Methyl [1,2,4]triazolo[1,5-a]pyridine-6-carboxylate: Properties & Uses
Methyl [1,2,4]triazolo[1,5-a]pyridine-6-carboxylate: Properties & Uses
Methyl [1,2,4]triazolo[1,5-a]pyridine-6-carboxylate is a bicyclic heteroaromatic ester that serves as a versatile building block in medicinal chemistry, enabling the rapid construction of triazolopyridine-containing pharmacophores with broad applications in drug discovery.
- Chemical Name
- Methyl [1,2,4]triazolo[1,5-a]pyridine-6-carboxylate
- SKU
- M726203
- Core Scaffold
- [1,2,4]triazolo[1,5-a]pyridine bicyclic system
- Functional Group
- Methyl ester at position 6, enabling amide coupling, hydrolysis, and reduction
- Primary Application
- Heterocyclic building block for medicinal chemistry and drug discovery
- Supplier
- Aladdin Scientific
Chemical Structure and Properties
Methyl [1,2,4]triazolo[1,5-a]pyridine-6-carboxylate consists of a fused bicyclic aromatic system in which a [1,2,4]triazole ring is annulated to a pyridine ring in the [1,5-a] orientation. This fusion creates a planar, electron-deficient heteroaromatic scaffold with enhanced π-conjugation compared to its monocyclic precursors. The methyl ester substituent at the 6-position of the pyridine ring provides a versatile handle for downstream chemical transformations.
The compound is a solid at ambient temperature and exhibits the characteristic stability associated with aromatic heterocycles. The electron-withdrawing nature of both the triazole nitrogen atoms and the ester group renders the ring system susceptible to nucleophilic aromatic substitution at appropriate positions, a property exploited in diversity-oriented synthesis. Its molecular formula reflects the combination of the triazolopyridine core with a carbomethoxy group, and the compound possesses a well-defined, drug-like molecular weight consistent with Lipinski's rule-of-five parameters.
Synthesis and Reactivity
The [1,2,4]triazolo[1,5-a]pyridine scaffold is typically accessed via cyclodehydration of 2-aminopyridine derivatives with appropriate one-carbon or two-carbon building blocks, or through intramolecular cyclization strategies. The methyl ester at the 6-position is introduced either as part of the starting pyridine or installed by late-stage functionalization.
The methyl ester group confers rich reactivity: it undergoes saponification to the corresponding carboxylic acid under basic aqueous conditions, enabling amide bond formation with amines via coupling reagents such as HATU or EDC. Reduction with lithium aluminium hydride or DIBAL-H affords the primary alcohol, which can be further oxidized or converted to leaving-group-bearing intermediates. The ester can also undergo Claisen-type condensation reactions, expanding access to β-ketoester analogues. These transformations make Methyl [1,2,4]triazolo[1,5-a]pyridine-6-carboxylate a highly productive node in synthetic planning for heterocyclic libraries.
Applications in Medicinal Chemistry and Drug Discovery
The [1,2,4]triazolo[1,5-a]pyridine motif is a privileged scaffold in drug discovery, appearing in compounds with reported activity across diverse therapeutic targets including kinases, phosphodiesterases, and central nervous system receptors. Its planar bicyclic geometry facilitates flat aromatic interactions with protein binding pockets, while the nitrogen-rich ring system engages in hydrogen bonding with key residues.
Methyl [1,2,4]triazolo[1,5-a]pyridine-6-carboxylate is employed as a key intermediate in the synthesis of focused libraries for target-based screening campaigns. The ester handle allows straightforward diversification to amides, enabling rapid structure–activity relationship (SAR) exploration. Researchers also use this building block in fragment-based drug discovery (FBDD) programs, where the compact, rigid triazolopyridine core provides an excellent starting fragment with appropriate ligand efficiency. Its utility in producing analogues for CNS drug candidates and kinase inhibitor programs has been noted in the broader literature on bicyclic heteroaromatic scaffolds.
Handling, Storage, and Safety
As with most heteroaromatic small molecules, Methyl [1,2,4]triazolo[1,5-a]pyridine-6-carboxylate should be handled following standard laboratory safety practices. Personnel should wear appropriate personal protective equipment including gloves, safety glasses, and a laboratory coat. Work should be conducted in a well-ventilated area or fume hood to minimise inhalation exposure.
The compound should be stored in a tightly sealed container away from moisture, light, and incompatible materials such as strong oxidisers and strong bases. Recommended storage conditions are typically at room temperature or as specified on the Certificate of Analysis (CoA) supplied with the product. Users should consult the Safety Data Sheet (SDS) provided by Aladdin Scientific for comprehensive hazard information, first-aid measures, and disposal guidance before working with this material.
Frequently asked questions
What is Methyl [1,2,4]triazolo[1,5-a]pyridine-6-carboxylate used for?
It is primarily used as a heterocyclic building block in medicinal chemistry and drug discovery. The methyl ester group allows facile conversion to amides, alcohols, and carboxylic acids, enabling rapid SAR exploration around the triazolopyridine scaffold. It is also employed in fragment-based drug discovery programs.
What chemical transformations can be performed on the methyl ester group?
The methyl ester can be hydrolysed to the carboxylic acid, which then undergoes amide coupling with amines using reagents such as HATU or EDC. Reduction with LiAlH4 or DIBAL-H gives the primary alcohol, and Claisen-type condensations are also feasible, providing access to β-ketoester derivatives.
How should this compound be stored?
The compound should be kept in a tightly sealed container, protected from moisture and light, and stored away from strong oxidisers and bases. Refer to the Certificate of Analysis (CoA) and Safety Data Sheet (SDS) provided by Aladdin Scientific for product-specific storage temperature and full safety details.
Is the [1,2,4]triazolo[1,5-a]pyridine scaffold relevant to any therapeutic areas?
Yes, the triazolopyridine scaffold appears in compounds with reported biological activity at kinases, phosphodiesterases, and CNS receptors, making it relevant to oncology, inflammation, and neurological disease research. Its privileged status in medicinal chemistry drives demand for building blocks such as M726203.
References
- Comprehensive Heterocyclic Chemistry III, Katritzky, A. R. et al. (Eds.), Elsevier, 2008. Chapter on fused triazolopyridine systems.
- Taylor, R. D.; MacCoss, M.; Lawson, A. D. G. Rings in Drugs. J. Med. Chem. 2014, 57, 5845–5859. doi:10.1021/jm4017625
- Aladdin Scientific Product Page: Methyl [1,2,4]triazolo[1,5-a]pyridine-6-carboxylate, SKU M726203.
Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.
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