Industrial Manufacturing Process of (Z)-2-(2-Aminothiazole-4-yl)-2-[(Trityloxy)imino]Acetic Acid (ATOA)
- Two-step hydrolysis of ethyl (Z)-(2-aminothiazol-4-yl)triphenylmethyloxyiminoacetate under mild alkaline conditions yields >90% reaction efficiency. High-purity ATOA is isolated via controlled crystallization at pH 4–5, achieving ≥96% HPLC purity for direct use in cefdinir synthesis.
- NINGBO INNO PHARMCHEM CO.,LTD. offers this pharmaceutical intermediate with full COA, scalable batch sizes, and cGMP-aligned documentation for global API manufacturers.
The compound (Z)-2-(2-Aminothiazole-4-yl)-2-[(trityloxy)imino]acetic acid—commonly referred to as ATOA, Z-ATOA, or (2Z)-(2-amino-1,3-thiazol-4-yl)[(trityloxy)imino]ethanoic acid (CAS: 128438-01-7)—is a critical pharmaceutical intermediate in the synthesis of third-generation cephalosporin antibiotics, most notably cefdinir. Its precise stereochemistry (Z-configuration) and high chemical purity are non-negotiable for downstream coupling reactions. As a premier global manufacturer, NINGBO INNO PHARMCHEM CO.,LTD. has optimized the manufacturing process to deliver consistent industrial purity while maximizing yield and minimizing impurities.
Step-by-Step Industrial Production Workflow
The industrial-scale synthesis route for ATOA begins with its ethyl ester precursor: ethyl (Z)-(2-aminothiazol-4-yl)triphenylmethyloxyiminoacetate. The conversion to the free acid is achieved through a controlled two-stage hydrolysis protocol:
- Alkaline Hydrolysis (Saponification): The ethyl ester is dissolved in ethanol and treated with potassium hydroxide (KOH) in aqueous medium at 20–30°C. The mixture is then gently refluxed at ~70°C until HPLC analysis confirms complete consumption of the starting material (<1.0 area%). This step cleaves the ethyl ester group, generating the potassium salt of ATOA in solution.
- Acidification and Crystallization: The reaction mixture is cooled to 10°C, and glacial acetic acid is carefully added to adjust the pH to 4–5. Under these mildly acidic conditions, (Z)-2-(2-Aminothiazole-4-yl)-2-[(trityloxy)imino]acetic acid precipitates selectively as a light yellow solid.
This optimized workflow consistently delivers a yield of 90.3% with ≥96% HPLC purity, as validated by 1H NMR (400 MHz, DMSO-d6): δ 6.69 (s, 1H, thiazole-H), 7.23–7.35 (m, 17H, trityl aromatic protons).
cGMP Compliance in ATOA Manufacturing
As a key building block for regulated antibiotics, ATOA must be produced under stringent quality frameworks. NINGBO INNO PHARMCHEM CO.,LTD. adheres to cGMP-aligned protocols throughout the manufacturing process, ensuring traceability, reproducibility, and regulatory readiness. Each batch is accompanied by a comprehensive Certificate of Analysis (COA) detailing:
- Identity confirmation (NMR, FT-IR)
- Purity assessment (HPLC, ≥96%)
- Residual solvent levels (GC, per ICH Q3C)
- Heavy metals and elemental impurities (ICP-MS, per ICH Q3D)
- Water content (KF titration)
This rigorous quality control enables seamless integration into clients’ Drug Master Files (DMFs) and supports regulatory filings worldwide.
Crystallization and Isolation Techniques for High Purity
The final isolation step is pivotal for achieving the required industrial purity. After pH adjustment to 4–5, the crude ATOA is filtered and subjected to a multi-stage wash sequence:
- Four rinses with deionized water to remove inorganic salts (e.g., potassium acetate)
- One rinse with cold ethanol to eliminate residual organic impurities
The wet cake is then dried under vacuum (25 mbar) at 60°C for 15 hours, yielding a free-flowing, light yellow powder. This gentle drying protocol prevents decomposition or epimerization, preserving the critical Z-configuration essential for biological activity in cefdinir.
When sourcing high-purity ATOA, buyers should prioritize suppliers with proven scale-up capability, analytical rigor, and regulatory documentation—all hallmarks of NINGBO INNO PHARMCHEM CO.,LTD.’s offering.
Technical Specifications Summary
| Parameter | Value |
|---|---|
| CAS Number | 128438-01-7 |
| Molecular Formula | C24H19N3O3S |
| Molecular Weight | 429.49 g/mol |
| Synthesis Route Yield | 90.3% |
| HPLC Purity | ≥96.0% |
| Key Application | Cefdinir intermediate |
| Available Form | Light yellow crystalline powder |
For bulk procurement of high-purity AT-TOA with reliable supply chain assurance, NINGBO INNO PHARMCHEM CO.,LTD. stands as a trusted partner for global pharmaceutical innovators seeking technical excellence and commercial reliability in cephalosporin intermediates.