[F:1][C:2]1[CH:3]=[C:4]2[C:10]([I:11])=[N:9][NH:8][C:5]2=[N:6][CH:7]=1.C(=O)([O-])[O-].[Cs+].[Cs+].Br[CH2:19][C:20]1[C:25]([F:26])=[CH:24][CH:23]=[CH:22][N:21]=1.O>CN(C=O)C>[F:1][C:2]1[CH:3]=[C:4]2[C:10]([I:11])=[N:9][N:8]([CH2:19][C:20]3[C:25]([F:26])=[CH:24][CH:23]=[CH:22][N:21]=3)[C:5]2=[N:6][CH:7]=16.291 g (23.921 mmol) of 5-fluoro-3-iodo-1H-pyrazolo[3,4-b]pyridine and 8.573 g (26.313 mmol) of caesium carbonate were put in DMF (10 ml) and then 5.00 g (26.313 mmol) of 2-(bromomethyl)-3-fluoropyridine dissolved in DMF (20 ml) was added dropwise. The mixture was stirred overnight at RT. Then it was left to cool and was poured into 200 ml water. A precipitate was filtered off with suction, it was washed with water and dried overnight under high vacuum. 6.28 g (70% of theor.) of the title compound was obtained.
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