N-Nitroso Chlorothiazide: Synthesis Attempts and Failure Report (NAP Test)

N‑Nitroso Chlorothiazide is a proposed nitrosamine‑related impurity associated with chlorothiazide, a thiazide diuretic. Under strong nitrosating conditions (e.g., nitrite in acidic media), nitrosatable nitrogens (such as sulfonamide/heterocyclic nitrogens in related structures) could potentially form an N‑nitroso derivative, prompting evaluation of formation risk.

EMA Guidance on Nitrosamines

According to EMA guidelines, if repeated synthesis attempts fail to detect the formation of nitrosamine impurities, it is likely that the impurity either does not exist or poses an extremely low risk.

Nitrosation

We conducted multiple nitrosation assays under rigorous forced conditions (NAP tests), to evaluate the risk of N-Nitroso Chlorothiazide formation. Our findings revealed that N-Nitroso Chlorothiazide does not readily undergo nitrosation under the expected conditions, significantly reducing concerns about its potential formation.

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Our synthesis failure report provides a detailed account of the findings from our synthesis attempts and rigorous testing, demonstrating the non-formation of the nitroso impurity. It offers a comprehensive overview of the evaluated conditions and the resulting data.

N-Nitroso Chlorothiazide Technical Information

• Molecular Weight: 324.72 g/mol
• Molecular Formula: C7H5ClN4O5S2
• IUPAC Name: 6-chloro-2-nitroso-2H-benzo[e][1,2,4]thiadiazine-7-sulfonamide 1,1-dioxide
• CAS Number: N/A
• Synonyms: N/A

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