Carbonic acid-guanidine (1:1) → 2-amino-6-furan-2-yl-5-methyl-3H-pyrimidin-4-one

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Following the method of Rorig and Nicholson (U.S. Pat. No. 2,710,867), a mixture of 3.00 g (15.3 mmol) (RS)-3-furan-2-yl-2-methyl-3-oxo-propionic acid ethyl ester and 1,38 g (7.65 mmol) guanidine carbonate in 20 ml ethanol was heated at 100° C. for 16 hours. The reaction mixture was then cooled to 0° C., whereupon the resulting crystals were collected by filtration and washed sequentially with water and with ice-cold ethanol to afford 1.80 g (62%) 2-amino-6-furan-2-yl-5-methyl-3H-pyrimidin-4-one as a white crystalline solid. ES-MS m/e (%): 190 ([M—H]−, 100).

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