Compound Overview and Chemical Properties

5-(Benzyloxy)-2-(2,5-dimethyl-1H-pyrrol-1-yl)pyridine (SKU: B189625) is a nitrogen-rich heterocyclic compound combining three key structural elements: a pyridine ring, an N-linked 2,5-dimethylpyrrole substituent at the 2-position, and a benzyloxy group at the 5-position of the pyridine core.

The benzyloxy group serves as a protecting group strategy for a latent hydroxyl (phenol or pyridinol) functionality, which can be deprotected under standard hydrogenolysis conditions (e.g., Pd/C, H₂) to reveal the free hydroxyl group for further functionalization. The 2,5-dimethylpyrrole moiety at the pyridine nitrogen acts as a masked primary amine; removal of the pyrrole protecting group under acidic aqueous conditions (e.g., hydroxylamine hydrochloride) liberates the free amine, which is a common strategy in multi-step synthesis.

This dual-protecting-group architecture makes the compound particularly useful as a differentiated building block in the construction of complex pyridine-based pharmacophores, enabling orthogonal deprotection sequences within a single synthetic route.

Safety and Handling Procedures

Personal Protective Equipment (PPE): Always wear chemical-resistant gloves (nitrile recommended), a laboratory coat, and safety glasses or goggles when handling this compound. If there is a risk of aerosol or dust generation, use a half-face respirator with organic vapor cartridges.

Ventilation: All weighing, dissolution, and reaction operations should be carried out inside a properly functioning chemical fume hood to minimize inhalation exposure.

Skin and Eye Contact: In the event of skin contact, wash the affected area thoroughly with soap and water for at least 15 minutes. For eye contact, irrigate immediately with large amounts of water and seek medical attention promptly.

Waste Disposal: Dispose of all waste containing this compound in accordance with local, regional, and national regulations for organic chemical waste. Do not discharge into drains or the environment.

Note: A full Safety Data Sheet (SDS) should be consulted prior to use. Contact Aladdin Scientific for the current SDS for SKU B189625.

Storage and Stability Recommendations

Temperature: Store at room temperature (15–25 °C) in a cool, dry location unless otherwise specified on the product label. Prolonged storage at reduced temperature (2–8 °C) may be advisable to maximize shelf life.

Light Sensitivity: The benzyloxy and pyrrole functionalities may be susceptible to photo-oxidation over time. Store in an amber glass vial or opaque container, protected from direct light exposure.

Moisture: Keep the container tightly sealed to prevent moisture ingress, which could promote hydrolysis of sensitive functional groups. Use desiccants (e.g., molecular sieves or silica gel) in the storage environment if humidity is a concern.

Container Compatibility: Glass or high-density polyethylene (HDPE) containers are suitable. Avoid prolonged contact with reactive plastics or metals.

Shelf Life: Verify the expiry date on the Certificate of Analysis (CoA). Re-verify purity by analytical methods (TLC, HPLC, or NMR) if the compound has been stored for an extended period prior to use.

Dissolution and Solution Preparation Protocol

Recommended Solvents: 5-(Benzyloxy)-2-(2,5-dimethyl-1H-pyrrol-1-yl)pyridine is expected to be soluble in common organic solvents such as dichloromethane (DCM), dimethyl sulfoxide (DMSO), tetrahydrofuran (THF), ethyl acetate, and acetonitrile. Solubility in aqueous systems is expected to be low due to the lipophilic benzyloxy and pyrrole groups.

Stock Solution Preparation:

1. Allow the compound vial to equilibrate to room temperature before opening to prevent condensation on the solid.
2. Tare a clean, dry glass vial on an analytical balance.
3. Weigh the required amount of compound and record the exact mass.
4. Add the appropriate volume of solvent to achieve the desired concentration. For DMSO stock solutions intended for biological assays, prepare at 10–100 mM and store in small aliquots at −20 °C to minimize freeze-thaw cycles.
5. Vortex or sonicate gently until complete dissolution is achieved. Confirm dissolution visually before use.

Working Solutions: Dilute stock solutions into aqueous buffer or reaction solvent immediately before use. For biological applications, ensure the final DMSO concentration in the assay is ≤0.1% v/v to avoid solvent-mediated cytotoxicity, unless otherwise validated.

Synthetic Applications and Deprotection Guidance

Role as a Dual-Protected Intermediate: This compound functions as a doubly masked 2-amino-5-hydroxypyridine equivalent. The two protecting groups can be removed sequentially under orthogonal conditions:

• Benzyloxy deprotection: Hydrogenolysis using Pd/C (5–10 wt%) under H₂ atmosphere (1 atm) in a protic solvent such as ethanol or methanol at room temperature typically cleaves the benzyl ether to give the free 5-hydroxypyridine derivative. Transfer hydrogenation with ammonium formate and Pd/C is an alternative when pressurized H₂ is not available.
• 2,5-Dimethylpyrrole deprotection: Treatment with hydroxylamine hydrochloride in aqueous ethanol or acetic acid/water mixtures under reflux conditions is the standard method for removal of the 2,5-dimethylpyrrole protecting group, liberating the free primary amine at the 2-position of pyridine.

Further Functionalization: Once individual functional groups are unmasked, the free amine or hydroxyl can participate in a wide range of transformations including reductive amination, acylation, sulfonylation, etherification, and transition-metal-catalyzed cross-coupling reactions.

Quality Control: Monitor reaction progress and product identity by TLC and confirm structure by ¹H NMR and LC-MS. Purity of isolated products should be assessed by HPLC prior to biological or advanced synthetic use.