[I:1][C:2]1[C:10]2[C:5](=[N:6][CH:7]=[N:8][C:9]=2[NH2:11])[NH:4][N:3]=1.C([O-])([O-])=O.[K+].[K+].F[C:19]1[CH:24]=[CH:23][C:22]([N+:25]([O-:27])=[O:26])=[CH:21][CH:20]=1.O>CN(C=O)C>[I:1][C:2]1[C:10]2[C:5](=[N:6][CH:7]=[N:8][C:9]=2[NH2:11])[N:4]([C:19]2[CH:24]=[CH:23][C:22]([N+:25]([O-:27])=[O:26])=[CH:21][CH:20]=2)[N:3]=1To a solution of 3-iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine (1) (5.22 g, 20 mmol) in DMF (60 mL) were added K2CO3 (8.3 g, 60 mmol) and 1-fluoro-4-nitrobenzene (2.96 g, 21 mmol). After the resulting mixture was stirred at 100° C. for 24 hr under N2 atmosphere, the reaction mixture was cooled to RT before pouring into water (200 mL). The precipitate was collected, washed with water and dried to provide 3-iodo-1-(4-nitrophenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine (27) (6.8 g, 89%) as light yellow solid. LC-MS (ESI): m/z (M+1) 383.1.
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