Rilpivirine N-oxide

Rilpivirine N-oxide is an oxidation derivative of the parent antiretroviral drug Rilpivirine, featuring a pyridine ring with an N-oxide functional group at the 4-position. The compound retains the 2,6-dimethyl substituents and 3-(trifluoromethyl)phenyl moiety characteristic of Rilpivirine but exhibits an oxygenated nitrogen center, altering its electronic and steric properties. This structural modification enhances polarity and influences solubility profiles compared to the parent compound. It arises as a synthetic byproduct during oxidative processes or degradation pathways involving pyridine nitrogen centers. This impurity serves as a critical HPLC reference standard for quantifying oxidation-related impurities in Rilpivirine drug substance batches.