[CH:1]([NH:4][C:5]1[N:10]=[C:9]([C:11](=O)[C:12]([C:14]2[CH:19]=[CH:18][C:17]([F:20])=[CH:16][CH:15]=2)=O)[CH:8]=[CH:7][N:6]=1)([CH3:3])[CH3:2].[CH2:22]1[N:27]2CN3CN(C2)C[N:23]1C3.[O-]S([O-])(=O)=O.[Na+].[Na+].[CH3:39]C(O)=O>>[C:1]([NH:4][C:5]1[N:10]=[C:9]([C:11]2[N:23]=[CH:22][NH:27][C:12]=2[C:14]2[CH:19]=[CH:18][C:17]([F:20])=[CH:16][CH:15]=2)[CH:8]=[CH:7][N:6]=1)([CH3:39])([CH3:3])[CH3:2]A mixture of 1-(2-iso-propylamino-pyrimidin-4-yl)-2-(4-fluoro-phenyl)-ethane-1,2-dione (12.5 g, 43.5 mmol), hexamethylenetetramine (12.2 g, 87.1 mmol), NH4OAc (17 g, 220 mmol), and Na2SO4 (12 g) in AcOH (150 mL) was heated at 65° C. After 4 h, the mixture was cooled to rt. The mixture was filtered, washing with AcOH. The filtrate was concentrated, and the residue was dissolved in CH2Cl2. The organic solution was washed with 1 N NaOH, dried (Na2SO4), and concentrated. The crude product was purified by column chromatography (MeOH/hexanes) to afford the title compound as a light yellow solid (6.8 g, 52%). TLC (10% MeOH/CH2Cl2): Rf=0.21. 1H NMR: 8.13 (br s, 1H), 7.84 (br s, 1H), 7.61 (br s, 2H), 7.14 (t, J=7.8 Hz, 2H), 6.87 (br s, 1H), 5.31 (br s, 1H), 4.14 (br s, 1H), 1.26 (d, J=9.8 Hz, 6H). HRMS (ESI): [M+H]+ calcd. for C16H17FN5, 298.1463; found, 298.1461.
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