Water → Methyl 2-amino-4-(4-fluorophenyl)-6-isopropylpyrimidine-5-carboxylate

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반응 단계

5.00 g of methyl 2-[1-amino-1-(4-fluorophenyl)-methylene]-4-methyl-3-oxopentanoate (18.7 mmol) were treated with 5 ml of N-N-dimethylacetamide and 15.71 g of a 50% strength aqueous cyanamide solution (187 mmol) and heated to reflux. After 5 h, the solution was poured onto 50 ml of water. The mixture was cooled in an ice bath and the deposited precipitate was isolated by means of a suction filter. After drying, 2.72 g of crude product were obtained in the form of a yellowish solid. After flash chromatography (150 g of silica gel; eluent: hexane/ethyl acetate 3:2), 1.19 g of methyl 2-amino-4-(4-fluorophenyl)-6-isopropylpyrimidine-5-carboxylate were isolated in the form of a colourless solid.

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