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0 °C

To a solution of methyl 3-[4-hydroxy-2-(methylthio)-6-oxopyrimidin-1(6H)-yl]-4-methylbenzoate (1.0 g, 0.0033 mol) in DMF (10.0 mL) obtained from step 2, was added potassium carbonate (0.7 g, 0.005 mol) followed by the addition of 2,4 difluorobenzyl bromide (0.8 g, 0.0039 mol) and stirred at 0° C. for 15 min. After stirring at room temperature for 30 min, DMF was distilled in vacuo and the residue was portioned between EtOAc (25 mL) and water (25 mL). The organic phase was washed with water, (2×20 mL), dried (Na2SO4) and concentrated. The resulting material was purified by flash chromatography using EtOAc/hexane (1:1 v/v) to afford the title compound (0.9 g, 64%) as a white powder: 1H NMR (CD3OD/400 MHz) δ 8.08 (dd, 1H, J=8.4 Hz, & 1.6 Hz), 7.83 (d, 1H, J=1.6 Hz), 7.55 (m, 2H), 6.99 (m 2H), 5.64 (s, 1H), 5.48 (s, 2H), 3.89 (s, 3H), 2.50 (s, 3H), and 2.15 (s, 3H); ES-HRMS m/z 433.1016 (M+H calcd for C21H19N2O4SF2 requires 433.1028).

1. stirringAfter stirring at room temperature for 30 min
2. distillationDMF was distilled in vacuo
3. washThe organic phase was washed with water, (2×20 mL),
4. dry with materialdried (Na2SO4)
5. concentrationconcentrated
6. customThe resulting material was purified by flash chromatography