Methyl 4-(4-fluorophenyl)-6-(1-methylethyl)-2-(methyl(methylsulfonyl)amino)-5-pyrimidinecarboxylate (CAS 289042-11-1) is a low-level synthetic impurity characterized by a pyrimidine core bearing a 4-fluorophenyl substituent and a methylsulfonylated secondary amine. It exhibits moderate polarity, UV absorbance compatible with reversed phase HPLC and a characteristic [M+H]+ ion in LC-MS, facilitating trace-level quantification. Formation is commonly linked to incomplete sulfonylation or methylation steps and to oxidative degradation. Control strategies include optimized reaction stoichiometry, scrubbed solvents, and routine stability and impurity profiling by HPLC, LC-MS and orthogonal NMR confirmation to meet specification limits.
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