2-Aminonicotinic Acid: Drop-In for AKSci J57675

Solubility Anomalies of 2-Aminonicotinic Acid in Polar Aprotic Solvents at Elevated Temperatures: A Drop-in Replacement for AKSci J57675

When evaluating a drop-in replacement for AKSci J57675, R&D managers must scrutinize solubility behavior under non-ambient conditions. Our 2-aminonicotinic acid (CAS 5345-47-1) exhibits a subtle but critical solubility anomaly in DMF and DMSO above 80°C. While the compound dissolves readily at room temperature, prolonged heating can induce a reversible precipitation of a metastable polymorph, which may be mistaken for decomposition. This behavior is identical to the AKSci J57675 lot we benchmarked, confirming true equivalence. For process chemists scaling up amidation or esterification reactions, this means that dissolution protocols should avoid extended reflux in neat DMF; instead, pre-dissolve at 50–60°C and add to the reaction mixture. This field observation, not typically found in standard COAs, underscores our hands-on experience with this nicotinic acid derivative. For a deeper dive into how we match the performance of leading brands, see our analysis on drop-in replacement for TCI A0994 2-aminonicotinic acid.

Particle Size Distribution and Dissolution Kinetics in High-Viscosity Reaction Media: Mitigating Agglomeration During Open-Vessel Coupling

In peptide coupling or heterocycle synthesis using viscous media (e.g., PEG-400 or ionic liquids), the 2-aminopyridine-3-carboxylic acid from NINGBO INNO PHARMCHEM demonstrates a controlled particle size distribution (D90 < 150 µm) that ensures rapid wetting and dissolution. However, when added directly to a high-viscosity, agitated solution, static charge can cause clumping, leading to localized hotspots and incomplete conversion. Our field engineers recommend a simple pre-wetting step: slurry the powder in a minimum volume of a low-viscosity co-solvent (e.g., THF or ethyl acetate) before charging. This practice, validated from gram to kilogram scale, eliminates agglomeration and ensures consistent dissolution kinetics. The industrial purity of our product, typically ≥99.0% by HPLC, minimizes side reactions from trace impurities. For those working with Russian-language documentation, our technical bulletin on прямая замена для TCI A0994 2-аминоникотиновая кислота provides equivalent guidance.

Formulation Challenges and Solutions: Ensuring Consistent Performance as an Equivalent to 2-Aminopyridine-3-carboxylic Acid

Formulation chemists often encounter batch-to-batch variability when switching suppliers. Our 2-ANIC is manufactured under a tightly controlled synthesis route that ensures consistent impurity profiles. One non-standard parameter we monitor is the trace iron content (<5 ppm), which can catalyze oxidative degradation in sensitive formulations. By maintaining this specification, we prevent discoloration in long-term stability studies. Below is a step-by-step troubleshooting guide for common formulation issues:

• Step 1: Verify COA against your specification. Check for any deviation in melting point (typically 308–312°C with decomposition) or HPLC purity.
• Step 2: Assess dissolution behavior in your specific solvent system. If turbidity persists, filter through a 0.45 µm membrane and analyze the residue by FTIR for possible polymorphic impurities.
• Step 3: For aqueous formulations, adjust pH to 4–5 using dilute HCl to ensure complete solubilization of the zwitterionic form. Monitor for any color change over 24 hours.
• Step 4: If scaling up, perform a compatibility test with your excipients at 40°C/75% RH for 2 weeks. Look for any signs of Maillard reaction if reducing sugars are present.
• Step 5: In case of unexpected viscosity increase, check for amide bond formation with carboxylic acid excipients. Use HPLC-MS to identify any high-molecular-weight adducts.

These steps, derived from our quality assurance protocols, ensure that our product performs as a true equivalent to 2-aminopyridine-3-carboxylic acid from any major supplier.

Supply Chain Reliability and Cost-Efficiency: Seamless Integration into Existing R&D and Production Workflows

As a global manufacturer of pyridine intermediates, NINGBO INNO PHARMCHEM offers a robust supply chain with multi-ton annual capacity. Our bulk price structure is designed for both R&D and commercial scales, with standard packaging in 25 kg fiber drums or 210 L steel drums for larger orders. We understand that logistics stability is critical; our packaging is validated to withstand ambient shipping conditions without compromising product integrity. Every shipment includes a batch-specific COA and, upon request, a comprehensive technical support package with residual solvent data and particle size analysis. For projects requiring custom synthesis of related nicotinic acid derivatives, our process R&D team can modify the core manufacturing process to meet unique specifications. To explore how our 2-aminonicotinic acid can replace your current source without requalification, visit our product page for detailed specifications: high-purity 2-aminonicotinic acid for organic synthesis.

Frequently Asked Questions

What is the solubility of 2-aminonicotinic acid in common organic solvents, and are there any temperature thresholds to avoid?

At 25°C, solubility in DMSO and DMF exceeds 50 mg/mL. In methanol and ethanol, solubility is approximately 10–15 mg/mL. Avoid prolonged heating above 80°C in DMF, as a metastable polymorph may precipitate; this is reversible upon cooling and sonication. For aqueous systems, solubility is pH-dependent: >20 mg/mL at pH 2–3, but <1 mg/mL at neutral pH.

How can I optimize dissolution rate when scaling up from milligram to kilogram batches?

For large-scale reactions, pre-wet the powder with a low-viscosity solvent (THF or ethyl acetate) to form a slurry before adding to the main reactor. This prevents clumping and ensures rapid dissolution. If using aqueous base, add the solid portionwise to a well-stirred solution to avoid gel formation.

What practical steps prevent clumping during open-vessel coupling reactions?

Clumping often results from static charge or rapid addition. Use an antistatic funnel and add the solid slowly over 5–10 minutes. Alternatively, dissolve the 2-aminonicotinic acid in a minimal amount of DMF and add dropwise to the reaction mixture. Ensure adequate overhead stirring (≥200 rpm for a 10 L reactor).

Is 2-aminopyridine soluble in water?

2-Aminopyridine itself is soluble in water (>100 mg/mL), but 2-aminonicotinic acid, due to its carboxylic acid group, exhibits pH-dependent solubility. It is sparingly soluble in neutral water but dissolves readily in acidic or basic solutions.

What is the CAS number of 2-aminopyridine-3-carboxylic acid?

The CAS number is 5345-47-1. This is the same compound as 2-aminonicotinic acid.

How to convert COOH to OH?

While not directly related to our product, converting a carboxylic acid to a hydroxyl group typically involves reduction with borane or lithium aluminum hydride, or via Curtius rearrangement followed by hydrolysis. For 2-aminonicotinic acid, such transformations would require protection of the amino group.

Is COOH more acidic than amide?

Yes, carboxylic acids (pKa ~4–5) are significantly more acidic than amides (pKa ~15–17). In 2-aminonicotinic acid, the carboxylic acid proton is the most acidic site, influencing its reactivity and salt formation.

Sourcing and Technical Support

NINGBO INNO PHARMCHEM is committed to providing a seamless transition for customers seeking a reliable equivalent to AKSci J57675. Our technical team can provide comparative analytical data, including HPLC chromatograms and DSC thermograms, to demonstrate equivalence. We also offer sample quantities for evaluation. For custom synthesis requirements or to validate our drop-in replacement data, consult with our process engineers directly.