Chemical Identity and Physical Properties

3-Bromo-2-(methylsulfonyl)pyridine is a substituted pyridine bearing a bromine atom at the 3-position and a methylsulfonyl group (–SO₂CH₃) at the 2-position. Its molecular formula is C₆H₆BrNO₂S, with a molecular weight of approximately 236.09 g/mol. The compound belongs to the class of heteroaryl sulfones and is typically obtained as a white to off-white solid at room temperature.

The pyridine ring nitrogen and the electron-withdrawing sulfonyl group act synergistically to render the ring strongly electron-deficient. This electronic character has direct implications for the compound's reactivity in nucleophilic aromatic substitution (SNAr) and transition-metal-catalyzed cross-coupling reactions. The C–Br bond at the 3-position is the primary site for metal-catalyzed functionalization, while the methylsulfonyl group at the 2-position can serve as a leaving group under certain nucleophilic conditions or as a directing/activating group in further transformations.

Synthetic Applications in Medicinal and Agrochemical Chemistry

3-Bromo-2-(methylsulfonyl)pyridine is widely employed as a bifunctional building block in the synthesis of complex heterocyclic targets. The two electrophilic handles—the aryl bromide and the methylsulfonyl group—allow sequential, orthogonal functionalization strategies to be employed in multi-step syntheses.

Palladium-Catalyzed Cross-Coupling: The C–Br bond readily undergoes Suzuki–Miyaura, Negishi, and Buchwald–Hartwig couplings with appropriate partners under standard palladium catalysis conditions. These reactions enable the introduction of aryl, heteroaryl, alkyl, or amino groups at the 3-position of the pyridine ring, generating structurally diverse libraries of compounds relevant to drug discovery programs.

Nucleophilic Aromatic Substitution (SNAr): The combination of the ring nitrogen and the 2-sulfonyl group creates a strongly activated electrophilic center. Nucleophiles such as amines, alkoxides, and thiolates can displace the methylsulfonyl group, providing 2-substituted-3-bromopyridine intermediates for further elaboration. This sequential SNAr/cross-coupling strategy is particularly valued in the rapid assembly of pyridine-containing pharmacophores.

Pharmaceutical and Agrochemical Relevance: Pyridine sulfonyl motifs appear in a range of biologically active molecules. This compound serves as an entry point to kinase inhibitor scaffolds, antifungal agents, and herbicide intermediates, where the electron-poor pyridine ring is a key structural feature driving target binding.

Handling, Safety, and Storage

As with all specialty chemical reagents, appropriate safety precautions must be observed when working with 3-Bromo-2-(methylsulfonyl)pyridine. Researchers should consult the current Safety Data Sheet (SDS) before use. General handling guidelines include:

• Personal Protective Equipment (PPE): Wear appropriate laboratory gloves, safety glasses or goggles, and a lab coat. Where dust or aerosol generation is possible, use a certified fume hood.
• Storage: Store in a cool, dry, well-ventilated area in a tightly sealed container, away from strong oxidizers, strong acids, and moisture. Keep away from heat and ignition sources.
• Waste Disposal: Dispose of the compound and contaminated materials in accordance with applicable local, regional, and national regulations for chemical waste.

Specific toxicological and physicochemical data should be verified from the official SDS provided with the product. Researchers are encouraged to perform a risk assessment before initiating work with this compound.

Ordering and Quality Specifications

Aladdin Scientific supplies 3-Bromo-2-(methylsulfonyl)pyridine under SKU B414646. The compound is characterized by standard analytical techniques to ensure suitability for research applications. Typical quality control methods for such building blocks include:

• Purity Assessment: High-performance liquid chromatography (HPLC) and/or gas chromatography (GC) are used to confirm purity. Specific purity grades and lot-specific certificates of analysis (CoA) are available upon request.
• Structural Confirmation: Identity is confirmed by nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry (MS).

Researchers requiring custom quantities, bulk orders, or specific purity grades are encouraged to contact Aladdin Scientific's technical sales team. Lot-specific CoA documents can be accessed through the Aladdin website using the product SKU and lot number.