Chemical Identity and Properties

(2,6-Dibromopyridin-3-yl)methanol (CAS not confirmed in source material; see review flags) is an aromatic heterocyclic compound featuring a pyridine ring substituted with bromine atoms at the 2- and 6-positions and a hydroxymethyl group at the 3-position. Its molecular formula is C₆H₅Br₂NO and its molecular weight is approximately 266.92 g/mol.

The two C–Br bonds are both reactive toward palladium- and nickel-catalyzed cross-coupling reactions, while the primary alcohol provides an additional handle for further derivatization (e.g., oxidation to aldehyde, conversion to halide, or protection as an ether). The differential reactivity between the C-2 and C-6 bromines can be exploited under carefully controlled conditions to achieve selective mono-coupling before complete functionalization, making this compound a highly attractive building block for the synthesis of complex heterocyclic architectures.

Safe Handling and Storage

Personal Protective Equipment (PPE): Always wear appropriate PPE when handling (2,6-Dibromopyridin-3-yl)methanol, including chemical-resistant gloves (e.g., nitrile), safety goggles, and a laboratory coat. Work in a well-ventilated fume hood to minimize inhalation exposure to dust or vapors.

Storage: Store the compound in a tightly sealed container in a cool, dry, and well-ventilated area, away from moisture, direct light, and incompatible materials (strong oxidizing agents, strong bases). Refrigerated storage (2–8 °C) is recommended to maintain long-term stability; bring to room temperature before opening to avoid condensation.

Disposal: Dispose of waste material in accordance with local, regional, and national regulations. Do not pour down the drain. Consult your institution's chemical waste management guidelines and the Safety Data Sheet (SDS) for detailed disposal procedures.

Note: Consult the product SDS (available from Aladdin Scientific) for complete hazard information before use.

Synthetic Protocol: Selective Mono-Suzuki–Miyaura Cross-Coupling

The following general protocol outlines a Suzuki–Miyaura cross-coupling approach for selective mono-arylation of (2,6-Dibromopyridin-3-yl)methanol. Optimization of catalyst loading, base, solvent, and temperature may be required for specific substrates. All steps should be performed under inert atmosphere (N₂ or Ar) unless otherwise stated.

1. Reagent preparation: Weigh (2,6-Dibromopyridin-3-yl)methanol (1.0 equiv, SKU M699404), arylboronic acid (1.0–1.1 equiv), and palladium catalyst (e.g., Pd(PPh₃)₄, 2–5 mol%) into a dry, inert-atmosphere-equipped round-bottom flask.
2. Solvent and base addition: Add a suitable solvent system (e.g., DMF/H₂O or dioxane/H₂O, 4:1 v/v) and an aqueous base (e.g., K₂CO₃, 2.0 equiv, 2 M aqueous solution). Degas the mixture by three freeze–pump–thaw cycles or by sparging with inert gas for 15 min.
3. Reaction: Heat the reaction mixture to 80–90 °C and stir for 12–18 h, monitoring by TLC or LCMS for starting material consumption and product formation.
4. Workup: Cool to room temperature. Dilute with ethyl acetate, wash with water and brine, dry over MgSO₄ or Na₂SO₄, filter, and concentrate under reduced pressure.
5. Purification: Purify the crude product by silica gel column chromatography (appropriate eluent system, e.g., hexane/ethyl acetate gradient) or by preparative HPLC if required.
6. Characterization: Confirm product identity and purity by ¹H NMR, ¹³C NMR, and HRMS.

Note: Specific conditions (catalyst, base, temperature, reaction time) should be optimized based on the boronic acid coupling partner and desired regioselectivity. Consult current literature for guidance on chemoselective mono-coupling of dihalopyridines.

Applications in Medicinal Chemistry and Drug Discovery

(2,6-Dibromopyridin-3-yl)methanol serves as a key intermediate in the synthesis of pharmacologically active heterocyclic compounds. Its bifunctional nature — combining two electrophilic halide sites with a nucleophilic alcohol — allows chemists to construct structurally complex, drug-like molecules through orthogonal functionalization strategies.

Typical uses include:

• Sequential Suzuki–Miyaura or Negishi cross-coupling to introduce diverse aryl or heteroaryl groups at C-2 and C-6 positions, enabling rapid generation of biaryl and triaryl pyridine libraries for structure–activity relationship (SAR) studies.
• Buchwald–Hartwig amination at one or both C–Br positions to introduce amino substituents relevant to kinase inhibitor and receptor ligand programs.
• Conversion of the primary alcohol to a reactive electrophile (e.g., mesylate, tosylate, or alkyl halide) for subsequent nucleophilic displacement reactions or ring-closure strategies.
• Oxidation of the hydroxymethyl group to an aldehyde or carboxylic acid for further condensation or amide coupling chemistry.

The pyridine nitrogen itself can coordinate to metal centers, making derivatives of this scaffold relevant to the design of metal-chelating pharmacophores and coordination chemistry applications.

Quality Control and Analytical Characterization

To confirm the identity and purity of (2,6-Dibromopyridin-3-yl)methanol (SKU M699404) upon receipt and after synthesis of derivatives, the following analytical methods are recommended:

• Purity assessment: HPLC (reverse-phase C18 column, UV detection at 254 nm) or GC analysis. Target purity ≥95% for synthetic applications (verify against certificate of analysis supplied by Aladdin Scientific).
• Identity confirmation: ¹H NMR (characteristic signals: aromatic CH protons of the pyridine ring; CH₂ protons of the hydroxymethyl group; OH proton). ¹³C NMR and mass spectrometry (ESI-MS or EI-MS, characteristic isotope pattern for two bromine atoms, M, M+2, M+4 in approximately 1:2:1 ratio) provide further confirmation.
• Melting point: Determine by standard melting-point apparatus and compare with literature values (specific value not confirmed in source material; flag for review).
• Moisture content: Karl Fischer titration recommended if the compound is to be used in moisture-sensitive reactions.

Always request and review the Certificate of Analysis (CoA) from Aladdin Scientific before use. Contact technical support for batch-specific analytical data.