Ethyl Acetate → 4-(Propylamino)-2-((2-(pyridin-4-yl)ethyl)amino)pyrimidine-5-carboxylic acid ethyl ester

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Reaction Steps

To a solution of 2-(methylthio)-4-(propylamino)pyrimidine-5-carboxylic acid ethyl ester (A1, 9.0 g) in N-methylpyrrolidone (88 mL), meta-chloroperbenzoic acid (70 to 75% wt, 10.8 g) was added portionwise under ice cooling, and the mixture was stirred at room temperature for 45 minutes. To the reaction mixture, meta-chloroperbenzoic acid (70 to 75% wt, 2.5 g) was added at room temperature, and the mixture was stirred at the same temperature for 3 hours. To the reaction mixture, saturated aqueous sodium hydrogencarbonate and ethyl acetate were added. The organic layer was separated, washed with saturated aqueous sodium chloride, and then dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. To a solution of the obtained residue in N-methylpyrrolidone (35 mL), N,N-diisopropylethylamine (11.9 mL) and 4-(2-aminoethyl)pyridine (6.3 mL) were added at room temperature, and the mixture was stirred at 100° C. for 4 hours. The reaction mixture was cooled to room temperature, and then poured into water (400 mL). The solid matter was taken by filtration, washed with water, and then dried under reduced pressure to obtain 4-(propylamino)-2-((2-(pyridin-4-yl)ethyl)amino)pyrimidine-5-carboxylic acid ethyl ester (A2, 9.2 g) as yellow solid.

Provenance & Evidence