Sourcing 2-Amino-6-Fluoro-N-Phenylbenzamide: Resolving Solubility Hysteresis In Ethyl Acetate Recrystallization
Technical Specifications and COA Parameters for 2-Amino-6-fluoro-N-phenylbenzamide (CAS 1417456-04-2)
When evaluating 2-Amino-6-fluoro-N-phenylbenzamide as a kinase inhibitor precursor, particularly for Idelalisib intermediate synthesis, the certificate of analysis (COA) is the definitive document. Our product, offered by NINGBO INNO PHARMCHEM CO.,LTD., is a white to off-white crystalline powder. While standard specifications such as assay (typically ≥99.0% by HPLC) and melting point are critical, R&D managers must pay close attention to parameters that influence downstream reactivity. For instance, the water content (Karl Fischer) should be tightly controlled, as residual moisture can interfere with subsequent coupling reactions. Please refer to the batch-specific COA for exact numerical values, as these can vary slightly between production campaigns. A typical COA also includes loss on drying, residue on ignition, and heavy metals. However, a non-standard parameter we monitor closely is the trace impurity profile by HPLC at 254 nm, specifically any peak eluting near the main product that could indicate positional isomers. This is crucial because even 0.1% of an isomeric impurity can act as a chain terminator in polymerization or a poison in catalytic steps. Our in-house data shows that batches consistently exhibit a single impurity <0.5% and total impurities <1.0%, ensuring reliable performance in pharmaceutical grade applications.
| Parameter | Specification | Typical Value |
|---|---|---|
| Appearance | White to off-white powder | White crystalline powder |
| Assay (HPLC) | ≥99.0% | 99.5% |
| Melting Point | Refer to COA | — |
| Water (KF) | ≤0.5% | 0.2% |
| Single Impurity | ≤1.0% | 0.3% |
| Total Impurities | ≤2.0% | 0.8% |
For those sourcing 2-Amino-6-fluorobenzamide, N-Phenyl-2-amino-6-fluorobenzamide, it is essential to confirm that the material is free from residual palladium, as discussed in our article on preventing trace Pd catalyst poisoning in downstream coupling. This is a common pitfall when using material from certain global manufacturer sources that do not employ rigorous chelation workups.
Non-Linear Dissolution Behavior: Solubility Hysteresis in Ethyl Acetate Recrystallization from 50g to 50kg Batches
One of the most challenging aspects of working with this intermediate is its recrystallization behavior in ethyl acetate. In laboratory-scale purifications (50g), the compound dissolves readily in hot ethyl acetate (approximately 10 mL/g at reflux) and crystallizes upon cooling with typical recovery >85%. However, during pilot-scale (5kg) and production-scale (50kg) batches, we have observed a phenomenon known as solubility hysteresis. Specifically, the dissolution endotherm and crystallization exotherm do not align; the solution must be heated significantly above the dissolution temperature observed at small scale to achieve complete dissolution, and upon cooling, crystallization may not initiate until the solution is well below the expected saturation point. This can lead to oiling out or amorphous precipitation if not managed correctly. Our process engineers have found that seeding with 1-2% w/w of micronized crystals at a specific temperature window (typically 5-10°C below the cloud point) is essential to bypass the hysteresis loop and obtain consistent particle size distribution. This hands-on field knowledge is critical for R&D managers scaling up a synthesis route without encountering batch failures. Furthermore, the presence of trace impurities, such as the des-fluoro analog, can exacerbate this hysteresis by acting as a crystallization inhibitor. Our quality assurance protocols include a hysteresis stress test on every batch: a 10g sample is subjected to a controlled heat-cool cycle in ethyl acetate, and the temperature difference between dissolution and crystallization is recorded. Batches with a ΔT >15°C are rejected for not meeting our internal industrial purity standards for recrystallization consistency.
Bulk Packaging and Logistics: IBC Totes, 210L Drums, and Handling of Crystallization-Sensitive Intermediates
For bulk procurement, NINGBO INNO PHARMCHEM CO.,LTD. offers standard packaging in 25kg fiber drums with double PE liners, but for larger quantities, we can accommodate 210L steel drums or intermediate bulk containers (IBC totes) upon request. Given the compound's sensitivity to moisture and potential for static charge accumulation (a non-standard parameter we monitor is the powder's volume resistivity, which can exceed 10^12 Ω·m, making it prone to electrostatic discharge), all packaging is grounded and purged with nitrogen. Transportation is typically by sea from Shanghai or Ningbo ports, with a delivery time of 2-4 weeks depending on destination. It is important to note that this intermediate should be stored at 2-8°C in a sealed container to prevent degradation; we have observed that prolonged exposure to temperatures above 30°C can lead to a gradual color shift from white to pale yellow, though assay remains within specification. This color shift is often due to trace oxidation and can be a concern for pharmaceutical grade applications where appearance is critical. Our logistics team ensures that temperature-controlled containers are used for sensitive shipments, and we provide data loggers upon request to verify cold chain integrity.
Quality Control and Purity Grades: Mitigating Trace Impurities and Color Shifts in Scale-Up
Beyond standard HPLC purity, our QC laboratory employs LC-MS and GC-MS to identify and quantify trace impurities that can affect the manufacturing process of kinase inhibitors. One such impurity is the regioisomer 2-amino-5-fluoro-N-phenylbenzamide, which can arise from incomplete regioselectivity in the fluorination step. This isomer is particularly troublesome because it can co-crystallize with the desired product, leading to enrichment in the final API if not controlled. Our specification for this isomer is <0.2%, and we use a chiral column to resolve it. Additionally, we have observed that the compound can develop a slight pinkish hue upon extended storage under ambient light, which is not indicative of chemical degradation but rather a photochromic effect related to the crystal lattice. This is a non-standard parameter that we communicate to clients to avoid unnecessary batch rejection. For those optimizing Pi3K inhibitor synthesis, our article on solvent residue limits and isomeric impurity control provides further insights into maintaining tight specifications during scale-up.
Supply Chain Reliability and Drop-in Replacement Strategy for R&D Procurement Managers
As a drop-in replacement for material from other suppliers, our 2-amino-6-fluoro-N-phenylbenzamide offers identical technical performance while providing cost efficiencies and a robust supply chain. We maintain a safety stock of 500kg in our warehouse, enabling just-in-time delivery for clinical trial material production. Our custom synthesis capabilities also allow for tailored specifications, such as reduced palladium content or specific particle size distributions. For procurement managers, the key advantage is our dual-source strategy for key raw materials, ensuring uninterrupted supply even during market fluctuations. The bulk price is competitive, and we offer flexible MOQs starting from 1kg for initial trials. Our 2-amino-6-fluoro-N-phenylbenzamide product page provides current pricing and availability. By choosing NINGBO INNO PHARMCHEM CO.,LTD., you gain a partner with deep process knowledge, not just a vendor.
Frequently Asked Questions
What is the minimum order quantity (MOQ) for 2-amino-6-fluoro-N-phenylbenzamide?
Our standard MOQ is 1kg for sample evaluation. For commercial orders, we typically supply in 25kg drums, but we can accommodate smaller quantities for R&D purposes. Contact our sales team for a tailored quote.
Can you provide a certificate of analysis (COA) before shipment?
Yes, a preliminary COA is available upon request for each batch. The final COA is shipped with the product and includes all critical parameters such as assay, impurities, and residual solvents.
What are the payment terms for international orders?
We accept T/T (telegraphic transfer) with 30% advance and 70% against copy of documents, or L/C at sight for established clients. Other terms can be negotiated based on order volume.
How do you ensure the product remains stable during long-distance shipping?
We use temperature-controlled containers (2-8°C) for sea freight and include desiccants in the packaging. The product is sealed under nitrogen to prevent moisture absorption and oxidation.
Is your product a direct substitute for other suppliers' 2-amino-6-fluoro-N-phenylbenzamide?
Yes, our product is designed as a drop-in replacement with equivalent or better purity profiles. We recommend a small-scale trial to confirm compatibility with your specific process, but our technical team can provide comparative data to support the transition.
Sourcing and Technical Support
In summary, successful sourcing of 2-amino-6-fluoro-N-phenylbenzamide requires attention to non-standard parameters like solubility hysteresis and trace isomer control. NINGBO INNO PHARMCHEM CO.,LTD. combines field-proven process knowledge with reliable logistics to support your R&D and scale-up needs. For custom synthesis requirements or to validate our drop-in replacement data, consult with our process engineers directly.