To a stirred solution of 2-amino-4,6-dimethoxypyrimidine (1 g, 6.45 mmol) in acetonitrile (10 mL) was added triethylamine (0.85 g, 8.40 mmol) at room temperature, followed by the slow dropwise addition of phenyl chloroformate (1.31 g, 8.37 mmol). The reaction mixture was heated to 60 °C and stirred for 6 hours. After completion of the reaction, the mixture was cooled to room temperature, diluted with water (6 mL), the precipitated solid was collected by filtration and dried under vacuum to afford 2-((phenoxycarbonyl)aminomethyl)-4,6-dimethoxypyrimidine (Compound 6) as a white solid in the following yields: 1.48 g, 83%; melting point: 119 °C; 1H NMR (400 MHz, DMSO-d6): δ 7.65 (s 1H), 7.42-7.40 (m, 2H), 7.18-7.14 (m, 3H), 5.80 (s, 1H), 3.96 (s, 6H); ESI-MS: m/z, 276.1 (M + 1).
