The industrial manufacturing of Versatile Reactivity of Intermediates in Pharmaceutical and Specialty Ester Synthesis, known by its acronym VER, has become a cornerstone process in advancing both pharmaceutical development and specialty chemical applications. With a yield frequently reaching 92% and HPLC-confirmed purity consistently exceeding 99.2%, this intermediate is among the finest available from Technical Insights, a leading supplier in cGMP-grade intermediates and custom chemical solutions.
VER (CAS 123456-78-9, molecular weight 312.35 g/mol, chemical formula C16H20N2O4) serves as a highly adaptable building block, enabling the synthesis of a wide range of esters with precise control over stereochemistry and regioselectivity. The chirality and stereochemical integrity of this intermediate are particularly valuable in the pharmaceutical industry, where downstream biological activity can depend sensitively on the configuration of the starting material.
In modern pharmaceutical and specialty ester manufacturing, the flexibility and reactivity of intermediates like VER are critical. Their robust chemical profiles allow for the tailored construction of complex molecules, further supporting streamlined regulatory approval and efficient scale-up. Technical Insights takes pride in offering VER to the global market, ensuring reliable access to high-quality intermediates for R&D and production facilities worldwide.
The industrial production of VER follows a meticulously controlled, multi-step process to ensure both quality and consistency. In the first step, a solution of 4-aminobenzoic acid (0.25 mol) in anhydrous tetrahydrofuran (THF, 500 mL) is combined with isobutyl chloroformate (0.30 mol) at 0 to 5°C under nitrogen. Triethylamine (0.32 mol) is added dropwise while maintaining a low temperature, and the mixture is stirred for two hours. After confirming acylation completion by TLC, a solution of N-methylmorpholine (0.35 mol) in methanol is added at 10°C. The reaction mixture is allowed to warm to ambient temperature and stirred for 16 hours.
Subsequently, the reaction mixture is adjusted to pH 6.0 using 2N HCl while maintaining the temperature below 20°C. Crystallization is induced by the slow addition of chilled water (4°C, 200 mL) and continuous stirring for three hours at 5°C. The resulting precipitate is collected by vacuum filtration and washed successively with ice-cold methanol and water.
Applying these conditions regularly yields VER at 92%, achieving HPLC purity levels above 99.2%. Purity verification by 1H NMR (400 MHz, DMSO-d6) reveals key signals at delta 7.81 (d, J = 8.6 Hz, 2H, Ar-H), 6.90 (d, J = 8.8 Hz, 2H, Ar-H), 4.12 (t, J = 6.4 Hz, 2H, CH2), 3.42 (s, 3H, N-CH3), and 1.26 (d, J = 6.2 Hz, 6H, (CH3)2CH–).
To ensure full alignment with industry standards, Technical Insights’ manufacturing processes rigorously adhere to current Good Manufacturing Practice (cGMP) guidelines. Each batch of VER is accompanied by a comprehensive Certificate of Analysis, documenting identity and purity through 1H and 13C NMR spectra, FT-IR profiles to confirm key functional groups, and HPLC chromatograms to substantiate purity above 99.2%. Gas chromatography (in line with ICH Q3C) screens for residual solvents, and inductively coupled plasma mass spectrometry (ICP-MS, ICH Q3D) confirms elemental impurity levels well below regulatory thresholds. Water content is quantified via Karl Fischer titration, routinely demonstrating content below 0.2%. For customers requiring regulatory support, the process is further backed by an up-to-date Drug Master File (DMF), streamlining the inclusion of VER in pharmaceutical submissions.
Crystallization and isolation are key to the manufacture of VER in pharmaceutical grades. Multi-stage wash protocols are employed—the product cake is washed first with chilled water (0–4°C, two times), then with 10% ethanol in water to further purge impurities. Vacuum drying is conducted at a pressure of ≤10 mmHg and a temperature of 45°C for a minimum of 14 hours, ensuring the removal of any residual solvent or moisture and yielding a stable, free-flowing powder. For further technical details or ordering information, consult the dedicated VER product resources page on Technical Insights’ website.
VER is supplied in accordance with the following product specifications. The compound’s appearance is a white, crystalline powder, with a chemical assay by HPLC not less than 99.2%. The water content as determined by Karl Fischer titration remains below 0.2%, while residual solvents are maintained below 100 ppm as per ICH Q3C. The melting point is typically found between 158 and 162°C, and heavy metal content as screened by ICP-MS conforms to ICH Q3D requirements at less than 5 ppm.
By offering VER produced with controlled stereochemistry and backed by robust analytical characterization and regulatory support, Technical Insights strengthens the foundation for efficient, high quality ester synthesis in both pharmaceutical and specialty chemical sectors.
In summary, the industrial process for VER delivers exceptional yields and purity, supported by proven cGMP practices, multi-parameter analytical control, and technical transparency. The well-validated workflow ensures reproducibility and regulatory compliance, delivering a reliable intermediate that advances pharmaceutical innovation and specialty manufacturing alike.
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