Chemical Structure and Key Properties

(5-Bromo-3-fluoropyridin-2-yl)methanol (CAS registry; SKU B172546) is a pyridine derivative substituted at three distinct positions. The bromine at the 5-position serves as a handle for transition-metal-catalyzed cross-coupling reactions such as Suzuki–Miyaura, Negishi, and Buchwald–Hartwig couplings. The fluorine atom at the 3-position modulates the electron density of the aromatic ring, lowering the pKa of the ring nitrogen and increasing resistance to metabolic oxidation — properties highly prized in drug-discovery programs. The primary alcohol (–CH₂OH) at the 2-position provides an orthogonal reactive site that can be oxidized to an aldehyde or carboxylic acid, converted to a leaving group via mesylation or tosylation, or protected as an ether, granting synthetic flexibility in multi-step sequences.

The combination of these three functional groups on a single pyridine scaffold makes this compound a genuinely multifunctional building block: chemists can selectively engage any one of the three sites under appropriate conditions, enabling rapid construction of structurally complex heterocyclic frameworks from a single starting material.

Applications in Medicinal Chemistry and Drug Discovery

Fluorinated pyridines are a cornerstone of modern drug design. The introduction of fluorine into a heterocyclic scaffold can improve metabolic stability, enhance membrane permeability, and fine-tune binding affinity through electrostatic and lipophilic interactions with target proteins. (5-Bromo-3-fluoropyridin-2-yl)methanol is therefore attractive as a fragment or advanced intermediate in the synthesis of candidate molecules targeting a wide range of biological pathways.

The aryl bromide enables rapid library expansion via palladium- or nickel-catalyzed cross-coupling, allowing medicinal chemists to install aryl, heteroaryl, vinyl, alkyl, or amino substituents at the 5-position with high efficiency. Simultaneously, the hydroxymethyl group can be elaborated into linkers, prodrug motifs, or conformationally constrained elements. This dual reactivity accelerates structure–activity relationship (SAR) exploration and supports diversity-oriented synthesis strategies commonly employed in hit-to-lead and lead optimization campaigns.

Synthetic Protocols and Handling Recommendations

Cross-coupling at C5 (Aryl Bromide): Standard Suzuki–Miyaura conditions — Pd(PPh₃)₄ or Pd(dppf)Cl₂ as catalyst, an arylboronic acid partner, K₂CO₃ or Cs₂CO₃ as base, and a mixed aqueous/organic solvent system (e.g., DME/H₂O or dioxane/H₂O) at 80–100 °C — are generally effective. The electron-withdrawing fluorine at C3 and the ring nitrogen both activate the C5–Br bond toward oxidative addition, often allowing milder conditions than unfunctionalized bromobenzenes.

Oxidation of the Hydroxymethyl Group: The –CH₂OH can be oxidized to the corresponding aldehyde using Dess–Martin periodinane (DMP), Swern conditions, or MnO₂ in dichloromethane at room temperature. Further oxidation to the carboxylic acid is achievable with KMnO₄, NaClO₂ (Pinnick), or Jones reagent.

Protection and Activation: Silyl protection (TBSCl, imidazole, DMF) is recommended when subsequent steps require the alcohol to be masked. Conversion to a mesylate or tosylate enables SN2 displacement for C–N, C–O, or C–S bond formation.

Handling: Store at 2–8 °C in a sealed container away from moisture and light. Use standard laboratory PPE. Consult the product SDS for full hazard information before use.

Ordering Information

(5-Bromo-3-fluoropyridin-2-yl)methanol is available from Aladdin Scientific under SKU B172546. Please contact your regional Aladdin representative or visit the product page for current pack sizes, pricing, availability, and certificate of analysis. Bulk quantities may be available upon request; inquire through the custom synthesis or procurement team for lead times and pricing on larger orders.