Overview and Chemical Identity

2-(4-Methyl-1H-pyrazol-1-yl)propanoic acid (Aladdin SKU: P728896) is a nitrogen-heterocyclic carboxylic acid in which a propanoic acid backbone bears a 4-methylpyrazol-1-yl substituent at the 2-position. The compound belongs to the class of N1-substituted pyrazole derivatives and features both a weakly basic pyrazole nitrogen and an acidic carboxylic acid group, making it a bifunctional building block of interest in drug discovery and synthetic chemistry programs.

The 4-methylpyrazole motif is a privileged pharmacophore found in several bioactive molecules, and introduction of the α-carboxylate handle allows straightforward coupling to amines, alcohols, and other nucleophiles via standard amide bond formation or esterification reactions.

Safety, Storage, and Handling

Personal Protective Equipment (PPE): When handling 2-(4-Methyl-1H-pyrazol-1-yl)propanoic acid, wear appropriate laboratory PPE including nitrile gloves, safety goggles, and a laboratory coat. Work in a well-ventilated fume hood whenever weighing or dissolving the compound to minimize inhalation of dust or aerosols.

Storage: Store the reagent in a tightly sealed container in a cool (2–25 °C), dry location protected from light, moisture, and incompatible materials such as strong oxidizers and strong bases. Follow the storage conditions specified on the product label and Certificate of Analysis (CoA).

Disposal: Dispose of waste material in accordance with local, regional, and national regulations governing the disposal of chemical waste. Do not pour solutions down the drain without first confirming compliance with applicable regulations.

Note: Refer to the Safety Data Sheet (SDS) supplied by Aladdin Scientific for complete hazard, first-aid, and regulatory information before use.

Solution Preparation Protocol

Step 1 – Equilibration: Remove the vial from cold storage and allow it to equilibrate to room temperature for at least 15 minutes before opening. This prevents condensation of atmospheric moisture onto the solid reagent.

Step 2 – Solvent Selection: 2-(4-Methyl-1H-pyrazol-1-yl)propanoic acid is expected to be soluble in polar aprotic solvents such as DMSO and DMF, and in polar protic solvents such as methanol and ethanol. Solubility in aqueous buffers can be enhanced by adjusting pH above the pKa of the carboxylic acid (typically ~4–5 for aliphatic carboxylic acids). Confirm solubility experimentally for your specific application conditions.

Step 3 – Weighing: Tare an appropriate vessel (e.g., 1.5 mL microcentrifuge tube or round-bottom flask). Weigh the required mass of compound on an analytical balance inside the fume hood. Record the actual mass accurately.

Step 4 – Dissolution: Add the calculated volume of solvent to achieve the desired concentration. Vortex or stir gently. If the material does not dissolve readily, sonicate briefly in a water bath sonicator for 1–2 minutes or warm gently (≤40 °C). Avoid heating above 50 °C to prevent degradation.

Step 5 – Filtration (optional): If any undissolved particulates remain, filter through a 0.22 µm syringe filter before use in sensitive assays.

Step 6 – Storage of Stock Solutions: Aliquot stock solutions into single-use volumes and store as recommended (e.g., −20 °C for DMSO stocks). Minimize freeze-thaw cycles to preserve compound integrity.

Application Notes in Synthetic Chemistry

The carboxylic acid functionality of 2-(4-Methyl-1H-pyrazol-1-yl)propanoic acid can be exploited in a variety of synthetic transformations commonly employed in medicinal chemistry laboratories:

• Amide Coupling: Activate the carboxylic acid using standard coupling reagents such as HATU, EDC/HOBt, or T3P in the presence of a base (e.g., DIPEA or triethylamine) and an appropriate amine partner to furnish amide products.
• Esterification: React with alcohols under acid catalysis (Fischer esterification) or using coupling reagents to produce ester derivatives for SAR exploration.
• Decarboxylative Functionalization: Under appropriate radical or transition-metal-catalyzed conditions, the carboxylate can serve as a leaving group to install the pyrazolylethyl radical onto coupling partners.
• Salt Formation: Prepare sodium, potassium, or ammonium salts for enhanced aqueous solubility in biological assays.

Optimize reaction conditions (temperature, solvent, reagent equivalents) empirically for each specific transformation. Confirm product identity by NMR, LC-MS, or HRMS.

Quality Control and Verification

Each lot of 2-(4-Methyl-1H-pyrazol-1-yl)propanoic acid (P728896) from Aladdin Scientific is supplied with a Certificate of Analysis (CoA) detailing purity, appearance, and identity confirmation data. Users should:

1. Verify the lot number on the CoA matches the vial label upon receipt.
2. Inspect the material for any unexpected colour change, caking, or moisture ingress that may indicate degradation during shipping.
3. Confirm identity and purity using ¹H NMR and HPLC (or LC-MS) if the application demands high confidence in compound integrity.
4. Record all lot numbers in laboratory notebooks for full experimental traceability.

Contact Aladdin Scientific technical support if the material does not meet specifications or if any quality concern arises.