In modern pharmaceutical and agrochemical research, heterocyclic compounds play a central role in the discovery and optimization of biologically active molecules. Among these, fused triazole–pyridazine derivatives have attracted significant attention due to their unique structural features and versatile chemical reactivity.
One such important compound is 3-tert-butyl-6-chloro-[1,2,4]triazolo[4,3-b]pyridazine, a specialized heterocyclic intermediate widely used in medicinal chemistry and advanced organic synthesis. Identified by CAS: 263401-62-3, this compound serves as a valuable building block in the development of new pharmaceutical candidates and functional materials.
This article provides a comprehensive overview of its chemical structure, physical properties, synthesis relevance, and industrial applications, along with its significance in modern drug discovery pipelines.
The compound 3-tert-butyl-6-chloro-[1,2,4]triazolo[4,3-b]pyridazine belongs to a class of fused bicyclic heterocycles composed of a triazole ring fused with a pyridazine ring. This structural arrangement provides both rigidity and electronic diversity, making it highly attractive in medicinal chemistry.
A [1,2,4]triazole ring, known for its pharmacological relevance
A pyridazine core, which contributes to electron-deficient aromaticity
A tert-butyl substituent at position 3, providing steric bulk and lipophilicity
A chlorine atom at position 6, enabling further chemical functionalization
The combination of electron-withdrawing and sterically demanding groups makes this molecule highly useful as a synthetic intermediate.
The physicochemical characteristics of this compound are essential for understanding its behavior in synthesis and formulation.
Chemical Name: 3-tert-butyl-6-chloro-[1,2,4]triazolo[4,3-b]pyridazine
CAS Number: 263401-62-3
Molecular Formula: C₉H₁₁ClN₄
Molecular Weight: 210.66 g/mol
Appearance: Typically a solid crystalline intermediate (depending on purity)
Purity: Commonly ≥98% in research-grade material
The presence of both heteroatoms (nitrogen and chlorine) and hydrophobic substituents results in a balanced polarity profile, making the compound suitable for a wide range of organic reactions.
![3-tert-butyl-6-chloro-[1,2,4]triazolo[4,3-b]pyridazine](/uploads/upload/20260420/260420134U4218.png)
Heterocyclic scaffolds such as triazolo-pyridazines are widely recognized in pharmaceutical research due to their ability to interact with biological targets, including enzymes, receptors, and nucleic acids.
The 3-tert-butyl-6-chloro-[1,2,4]triazolo[4,3-b]pyridazine scaffold is particularly interesting because:
The nitrogen atoms in the triazole and pyridazine rings can participate in hydrogen bonding interactions, which are essential for binding affinity in drug-target interactions.
The fused heterocycle exhibits electron deficiency, allowing it to interact with nucleophilic sites in biological macromolecules.
The chlorine substituent at the 6-position serves as a reactive site for nucleophilic substitution, enabling structural diversification.
The tert-butyl group increases hydrophobic character, improving membrane permeability in potential drug molecules.
These combined features make it a valuable scaffold for lead compound development.
In synthetic chemistry, this compound is primarily used as a heterocyclic building block. Its functional groups allow chemists to perform further derivatization and construct more complex molecules.
Cross-coupling reactions (e.g., Suzuki, Buchwald–Hartwig)
Nucleophilic substitution at the chloro position
Scaffold diversification for structure–activity relationship (SAR) studies
Intermediate formation in multi-step drug synthesis routes
Because of its reactive chlorine atom and stable fused ring system, it is often used as a key intermediate rather than a final product.
Although not a drug itself, 3-tert-butyl-6-chloro-[1,2,4]triazolo[4,3-b]pyridazine is frequently used in early-stage drug discovery programs.
Triazole-containing compounds often show activity against kinase targets involved in tumor growth.
Heterocyclic systems can disrupt bacterial enzyme function or cell wall synthesis pathways.
Pyridazine derivatives have been explored for neurological receptor modulation.
Structural analogs are studied for inhibition of inflammatory mediators.
The versatility of this scaffold allows medicinal chemists to modify it for multiple biological targets.
The chlorine atom at the 6-position plays a crucial role in synthetic flexibility. It acts as a leaving group in substitution reactions, enabling:
Formation of carbon–carbon bonds
Formation of carbon–nitrogen bonds
Introduction of polar or charged substituents
This reactivity is particularly important in medicinal chemistry, where late-stage functionalization is a key strategy in optimizing drug candidates.
The tert-butyl group is not merely a structural decoration; it significantly influences the compound’s chemical and biological behavior:
Increased metabolic stability
Improved lipophilicity
Steric shielding of reactive centers
Enhanced binding selectivity in drug design
In many cases, bulky alkyl groups like tert-butyl are introduced to improve pharmacokinetic properties of lead compounds.
Compounds like 3-tert-butyl-6-chloro-[1,2,4]triazolo[4,3-b]pyridazine are primarily used in:
Pharmaceutical R&D laboratories
Agrochemical development
Academic research in heterocyclic chemistry
Custom synthesis and contract manufacturing
They are typically classified as research intermediates, meaning they are not intended for direct therapeutic use but serve as essential components in synthesis pipelines.
As with most heterocyclic intermediates, proper handling is required:
Use in a controlled laboratory environment
Wear appropriate personal protective equipment (PPE)
Avoid inhalation, ingestion, or direct skin contact
Store in a cool, dry, and well-ventilated area
Since it is a research chemical, safety data should always be reviewed before handling.
The continued interest in triazolo-pyridazine systems suggests that compounds like this will remain important in future drug discovery efforts. Areas of development include:
Kinase inhibitor libraries
Fragment-based drug design
Heterocyclic scaffold optimization
Agrochemical innovation
As computational chemistry and AI-assisted drug design evolve, such intermediates will likely play an even greater role in rapid molecular screening.
3-tert-butyl-6-chloro-[1,2,4]triazolo[4,3-b]pyridazine (CAS: 263401-62-3) is a structurally sophisticated heterocyclic intermediate with significant value in modern organic and medicinal chemistry. Its fused triazole–pyridazine core, combined with strategically placed substituents, makes it highly versatile for synthetic modification and drug discovery applications.
Although not a final pharmaceutical product, its importance lies in its role as a building block for innovation, enabling chemists to design and synthesize new molecules with potential therapeutic benefits.
As research continues to advance, compounds of this type will remain essential tools in the expansion of chemical space and the development of next-generation biologically active agents.
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