Chemical Identity and Physical Properties

Piperidine-3-carbonitrile hydrochloride is the hydrochloride salt of piperidine-3-carbonitrile, a saturated six-membered nitrogen-containing heterocycle substituted with a nitrile (cyano, –C≡N) group at the 3-position of the ring. The hydrochloride salt form is preferred in research settings because protonation of the ring nitrogen yields a more crystalline, bench-stable solid with enhanced aqueous solubility compared with the free base, facilitating accurate weighing and solution preparation.

The molecule contains two key reactive sites: (1) the secondary amine nitrogen (present as its conjugate acid in the salt form, pKa of the conjugate acid typically in the range of 9–11 for piperidinium systems, though the exact value for this compound should be confirmed experimentally) and (2) the nitrile carbon, which is electrophilic and amenable to nucleophilic addition, cycloaddition, and reduction chemistry. The 3-position substitution pattern introduces a chiral center at C-3, making enantioselective synthesis and chiral resolution of this compound relevant in asymmetric medicinal chemistry programs.

Researchers should consult the product-specific Certificate of Analysis (CoA) and Safety Data Sheet (SDS) available from Aladdin Scientific for confirmed physicochemical data including molecular weight, melting point, purity specification, and appearance.

Synthetic Applications and Reactivity

The dual functionality of piperidine-3-carbonitrile hydrochloride — a nucleophilic amine and an electrophilic nitrile — makes it a highly enabling building block for multi-step synthesis. Before use in reactions requiring the free base, the hydrochloride salt is typically neutralized with a mild base (e.g., triethylamine, sodium carbonate, or potassium carbonate) in the reaction solvent.

N-Functionalization: The ring nitrogen can be alkylated, acylated, sulfonylated, or subjected to reductive amination to introduce diverse substituents, enabling rapid library synthesis around the piperidine scaffold. These transformations are central to structure–activity relationship (SAR) campaigns in drug discovery.

Nitrile Transformations: The nitrile group can be:

• Hydrolyzed (acid or base catalysis) to the corresponding carboxylic acid or amide
• Reduced (e.g., with LiAlH4 or catalytic hydrogenation) to the primary amine, yielding a 3-(aminomethyl)piperidine
• Converted to tetrazoles via [3+2] cycloaddition with azides — a bioisosteric replacement strategy widely used in medicinal chemistry
• Used in Knoevenagel condensations or as a component in multi-component reactions

This reactivity profile allows chemists to access a broad range of structurally diverse analogues from a single starting material, making P172500 a cost-effective investment for combinatorial and medicinal chemistry programs.

Role in Medicinal Chemistry and Drug Discovery

The piperidine ring is among the most prevalent nitrogen heterocycles found in approved pharmaceuticals and clinical candidates. Its saturated character confers favorable three-dimensional geometry, and substitution at the 3-position introduces both a stereocenter and a vector for appending additional pharmacophoric elements — features that are highly valued in modern drug design, particularly in the context of escaping from planarity and improving ADMET properties.

The nitrile group at the 3-position itself can serve as a pharmacophore: nitriles are found in several marketed drugs (e.g., cimetidine, anastrozole, vildagliptin) where they interact with enzyme active sites through hydrogen bonding or reversible covalent mechanisms. Incorporating a nitrile on a piperidine scaffold therefore merges two drug-relevant motifs in a single, compact molecule.

Piperidine-3-carbonitrile hydrochloride is commonly employed as an intermediate in the synthesis of kinase inhibitors, protease inhibitors, GPCR ligands, and CNS-active compounds. Its use in fragment-based drug discovery (FBDD) and high-throughput screening (HTS) compound libraries is also documented in the broader synthetic chemistry literature.

Note: Specific biological activity data for this compound itself should be obtained from primary literature or internal screening data; no intrinsic pharmacological activity is implied by this building block designation.

Handling, Storage, and Safety Considerations

General Handling: Piperidine-3-carbonitrile hydrochloride should be handled in accordance with standard laboratory safety practices for fine chemical reagents. Use appropriate personal protective equipment (PPE) including chemical-resistant gloves, safety glasses or goggles, and a laboratory coat. Operations that may generate dust should be performed in a fume hood or with appropriate respiratory protection.

Storage: Store the compound in a tightly sealed container in a cool, dry, well-ventilated location away from moisture, heat sources, and incompatible materials (strong oxidizers, strong acids, strong bases). The hydrochloride salt form generally provides good solid-state stability; however, prolonged exposure to atmospheric moisture or elevated temperatures may affect purity over time. Refer to the product SDS for specific storage temperature recommendations.

Disposal: Dispose of this compound and contaminated materials in accordance with local, regional, and national regulations governing chemical waste. Do not discharge into drains or the environment.

First Aid: In case of skin or eye contact, flush with copious amounts of water for at least 15 minutes and seek medical attention if irritation persists. If inhaled, move to fresh air. Consult the full Safety Data Sheet (SDS) available from Aladdin Scientific for comprehensive hazard, first-aid, and emergency response information before use.