[F:1][C:2]1[CH:7]=[N:6][C:5]2[NH:8][CH:9]=[CH:10][C:4]=2[C:3]=1[CH:11]=[O:12].[I:13]I.[I-].[Na+].[OH-].[Na+]>CCO.OS([O-])=O.[Na+]>[F:1][C:2]1[CH:7]=[N:6][C:5]2[NH:8][CH:9]=[C:10]([I:13])[C:4]=2[C:3]=1[CH:11]=[O:12]To a solution of 5-fluoro-1H-pyrrolo[2,3-b]pyridine-4-carbaldehyde (2.45 g, 14.93 mmol) in EtOH (20 mL) was added iodine (4.55 g, 17.91 mmol), sodium iodide (2.68 g, 17.91 mmol) and aqueous NaOH (1N, 15 mL). The reaction mixture was stirred for 4 h at 25° C. and diluted with aqueous NaHSO3 (0.1N). An orange precipitate was collected by filtration and dried under vacuum to afford the title compound as a yellow solid (6.54 g, 82%). [M+H] calc'd for C8H4F1N2O, 291; found, 291.5.
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