Dolutegravir-Imp-1-4 F

Dolutegravir-Imp-1-4 F is a defluorinated synthetic byproduct derived from the parent integrase inhibitor dolutegravir, characterized by the absence of the 5-fluoropyrimidine moiety and retention of the cyclopropylmethyl ester and pyridin-2-ylmethylamine core. This impurity arises during late-stage synthesis via nucleophilic displacement pathways, resulting in a structurally simplified analog with altered hydrogen bonding capacity. The compound exhibits distinct chromatographic behavior due to reduced electron density in the aromatic scaffold, enabling its quantification as an HPLC reference standard for process validation in dolutegravir manufacturing.