Hydrochloric Acid → 2-Methylthio-4-propylamino-5-pyrimidine carboxylic acid ethyl ester

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To a solution of 4-chloro-2-(methylthio)pyrimidine-5-carboxylic acid ethyl ester (11.6 g) in tetrahydrofuran (100 mL), triethylamine (8.4 mL) and propylamine (5.1 mL) were added under ice cooling, and the mixture was stirred at room temperature for 30 minutes. To the reaction mixture, 1.0 mol/L aqueous hydrochloric acid and ethyl acetate were added. The organic layer was separated, washed successively with saturated aqueous sodium hydrogencarbonate and saturated aqueous sodium chloride, and then dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure to obtain oily 2-(methylthio)-4-(propylamino)pyrimidine-5-carboxylic acid ethyl ester (A1, 11.7 g).

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