Bromine → 8-Cyclohexyl-2-methylsulfanyl-5-oxo-5,8-dihydro-pyrido[2,3-d]pyrimidine-6-carboxylic acid ethyl ester

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Bromine (0.15 g, 0.94 mmol) was added to a solution of 8-cyclohexyl-2-methylsulfanyl-5-oxo-5,6,7,8-tetrahydro-pyrido[2,3-d]pyrimidine-6-carboxylic acid ethyl ester (0.28 g, 0.79 mmol) in DCM (10 mL). After 5 min, the solution was concentrated and the crude residue was redissolved in DCM (10 mL) and diisopropylethylamine (0.42 mL, 2.4 mmol) was added. After 15 h, the reaction mixture was partitioned between water and DCM, the organic layer was separated, dried (MgSO4) and concentrated to provide 0.28 g (87%) of the title compound.). Mass Spectrum (LCMS, ESI pos.) Calcd. For C17H21N3O3S: 347.13, found: (M+H) 348.3.

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