Cl[CH2:2][C:3]1[NH:8][C:7](=[O:9])[NH:6][C:5](=[O:10])[CH:4]=1.[F:11][C:12]([F:16])([F:15])[CH2:13][OH:14].C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C)C=O>[F:11][C:12]([F:16])([F:15])[CH2:13][O:14][CH2:2][C:3]1[NH:8][C:7](=[O:9])[NH:6][C:5](=[O:10])[CH:4]=1A mixture of 6-(chloromethyl)pyrimidine-2,4(1H,3H)-dione (1 g, 6.23 mmol), 2,2,2-trifluoroethanol (2.235 mL, 31.14 mmol) and cesium carbonate (6.09 g, 18.68 mmol) in dimethylformamide (10 mL) was heated in a microwave oven at 100° C. for 30 min. The mixture was filtered and the volatiles were removed in vacuum. The residue was treated with diluted HCl (pH 4.5) and cooled to 0° C. The resulting crystals were collected by filtration and dried in vacuum cabinet to yield the title compound, 0.92 g (66%).
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