Caesium carbonate (2.3 g, 7.2 mmol) was added to a degassed solution of 2-amino-4-(1,2-dimethylimidazol-5-yl)pyrimidine (Method 26; 756 mg, 4 mmol), 4-iodosulphonyl fluoride (Method 58; 1.50 g, 5.2 mmol), tris(dibenzylideneacetone)dipalladium (0) (92 mg, 0.18 mmol) and 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl (124 mg, 0.18 mmol) in dioxane (36 ml) under nitrogen. The mixture was heated at 80° C. for 18 hours and then allowed to cool to ambient temperature. The mixture was poured into water (50 ml) and extracted with DCM (2×50 ml). The organic extracts were combined, washed with brine (50 ml), dried and the solvent evaporated. The residue was pre-absorbed on to silica gel and purified by column chromatography on silica gel eluting with DCM/2% methanolic ammonia (100:0 increasing in polarity to 97:3) to give the title compound (984 mg, 71%) as a pale yellow solid. NMR 2.38 (s, 3H), 3.96 (s, 3H), 7.28 (d, 1H), 7.65 (s, 1H), 8.00 (d, 2H), 8.13 (s, 2H), 8.47 (d, 1H), 10.32 (s, 1H); m/z 348.
