Trimethylsilyldiazomethane → Methyl 5-bromo-2-(methylsulfanyl)pyrimidine-4-carboxylate

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5-bromo-2-(methylthio)pyrimidine-4-carboxylic acid (2 g, 8.03 mmol) was stirred in MeOH (40 mL) at room temperature. To this stirred mixture was added (trimethylsilyl)diazomethane (12.04 mL, 2M, 24-09 mmol). LCMS of aliquot taken immediately after addition indicated there was still unreacted starting acid. Added more (trimethylsilyl)diazomethane (6 mL, 2 M, 12 mmol). LCMS indicated completion of reaction. The reaction was quenched adding about 0.5 mL of TFA into the crude mixture. Volatiles were removed under reduced pressure. The resulting crude mixture was purified by flash chromatography (SiO2, Biotage 40M cartridge). The column was eluted with a EtOAc/hexanes gradient mixture (0% to 30%). Related fraction were pooled and evaporated to afford a colorless crystalline solid as the titled compound. LCMS calc.=263.94; found=264.79.

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