Rilpivirine iodo

Rilpivirine iodo is an iodinated pyridine-piperazine derivative featuring a 2-iodo-3-pyridinyl substitution on the core scaffold of Rilpivirine, where the parent compound contains a 2-amino-3-pyridinyl group. The iodo functional group introduces a halogenated branching point at the pyridine ring’s 2-position, disrupting the electronic conjugation critical for the parent drug’s NNRTI activity. This impurity arises as a partial substitution byproduct during synthetic coupling steps involving iodinated precursors. Its distinct halogen mass and polarity enable differentiation via high-resolution MS and NMR, serving as a reference standard for HPLC-based quantification of residual iodinated intermediates in Rilpivirine API batches.