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

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Reaction Steps

m-CPBA (0.33 g, 1.5 mmol of a 70% w/w mixture) was added to a solution of 8-cyclohexyl-2-methylsulfanyl-5-oxo-5,8-dihydro-pyrido[2,3-d]pyrimidine-6-carboxylic acid ethyl ester (0.206 g, 0.59 mmol) in dichloromethane (15 mL). After 2 hours, a 10% solution of Na2SO3 (1 mL) was added and the mixture was partitioned between sat. NaHCO3 and dichloromethane. The organic layer was dried (MgSO4) and concentrated to provide 0.22 g of the title compound. Mass Spectrum (LCMS, ESI pos.) Calcd. For C17H21N3O5S: 379.12. found: (M+H) 380.1.

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