[NH2:1][C:2]1[N:7]([C:8]2[CH:13]=[CH:12][C:11]([I:14])=[CH:10][C:9]=2[F:15])[C:6](=[O:16])[NH:5][C:4](=[O:17])[CH:3]=1.[CH3:18][N:19]([CH3:22])[CH:20]=O.CN(C(OC)OC)C.C(O)(C)C>O>[F:15][C:9]1[CH:10]=[C:11]([I:14])[CH:12]=[CH:13][C:8]=1[N:7]1[C:2]([N:1]=[CH:18][N:19]([CH3:22])[CH3:20])=[CH:3][C:4](=[O:17])[NH:5][C:6]1=[O:16]To a mixture (21.8 g) of 6-amino-1-(2-fluoro-4-iodophenyl)-1H-pyrimidine-2,4-dione 80 and 78 was added N,N-dimethylformamide (42.0 ml) and N,N-dimethylformamidedimethylacetal (21.0 ml) and the mixture was stirred at room temperature for 4.5 hrs. With stirring at room temperature, isopropyl alcohol (20.0 ml) was added, and water (100 ml) was added dropwise. The mixture was stirred at room temperature for 45 min, and the precipitated crystals were collected by filtration, washed with water and dried to give N′-[3-(2-fluoro-4-iodophenyl)-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl]-N,N-dimethylformamidine 81 (21.7 g, yield 67.7% from 78) as colorless crystals.
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