Chemical Identity and Structure

5-Amino-2-bromo-3-fluoropyridine is a trisubstituted pyridine derivative bearing three distinct functional groups: a primary amino group at the 5-position, a bromine atom at the 2-position, and a fluorine atom at the 3-position. Its molecular formula is C₅H₄BrFN₂ with a molecular weight of approximately 191.00 g/mol. The pyridine ring nitrogen contributes to the compound's basicity and coordinates with metal catalysts during transition-metal-mediated reactions.

The spatial arrangement of substituents creates a compound with orthogonal reactivity: the C–Br bond is highly amenable to oxidative addition in palladium- and copper-catalyzed cross-coupling reactions, the C–F bond can participate in nucleophilic aromatic substitution (SNAr) under appropriate conditions, and the free primary amine allows for further functionalization via acylation, reductive amination, or heterocycle formation. This combination makes the molecule an exceptionally flexible scaffold for constructing complex nitrogen-containing architectures.

Synthetic Applications in Medicinal and Heterocyclic Chemistry

5-Amino-2-bromo-3-fluoropyridine is predominantly used as a building block in the synthesis of pharmaceutically relevant heterocyclic compounds. The aryl bromide at the 2-position serves as a handle for Suzuki–Miyaura, Negishi, Buchwald–Hartwig, and Sonogashira cross-coupling reactions, enabling the introduction of diverse aryl, heteroaryl, alkyl, or alkynyl groups at this position with high chemoselectivity.

The 5-amino group can be used to construct fused bicyclic or polycyclic systems. For example, condensation of the amine with carbonyl-containing partners can yield pyrido-fused rings such as pyrido[2,3-d]pyrimidines or naphthyridines, structural motifs frequently encountered in kinase inhibitors and antibacterial agents. The fluorine at the 3-position modulates the electron density of the ring, enhances metabolic stability in drug candidates, and may participate in directed SNAr reactions when combined with strong nucleophiles.

Researchers designing fragment-based libraries or lead optimization campaigns value this compound for its ability to rapidly diversify around a drug-like pyridine core while maintaining compliance with Lipinski's rule-of-five parameters in downstream targets.

Handling, Safety, and Storage Guidelines

As with most halogenated aniline-type compounds, 5-Amino-2-bromo-3-fluoropyridine should be handled with appropriate personal protective equipment, including nitrile gloves, laboratory coat, and safety glasses. Work should be performed in a well-ventilated fume hood to minimize inhalation exposure to dust or vapors.

Store the compound in a tightly sealed container in a cool, dry, and well-ventilated area, away from direct light, moisture, and incompatible materials such as strong oxidizers and strong acids. Moisture control is particularly important because primary aromatic amines can be sensitive to oxidative degradation upon prolonged exposure to air and light, potentially leading to discoloration and reduced purity.

Dispose of waste materials in accordance with local regulations governing halogenated organic compounds. Consult the Safety Data Sheet (SDS) for complete hazard classification, first-aid measures, and disposal procedures before use. All new users should review the SDS prior to working with this reagent.

Quality, Purity, and Procurement from Aladdin Scientific

Aladdin Scientific supplies 5-Amino-2-bromo-3-fluoropyridine under SKU A586794. Research-grade reagents from Aladdin Scientific are subject to quality control protocols designed to ensure batch-to-batch consistency. Researchers should verify purity specifications on the product certificate of analysis (CoA) prior to use in sensitive synthetic sequences or biological assays.

When evaluating reagent suitability, consider the purity grade relative to your application: high-purity (≥97%) material is recommended for medicinal chemistry lead synthesis and structure–activity relationship (SAR) studies, where impurity profiles can confound biological data. For less demanding applications such as method development or teaching demonstrations, lower-grade material may be acceptable.

Procurement teams should reference SKU A586794 when placing orders. For volume pricing, custom packaging, or certificate of analysis requests, contact Aladdin Scientific's customer service team directly. Reward points and promotional pricing may apply; consult the current Aladdin catalog or website for details.