[Cl:1][C:2]1[C:7]2[C:8]([I:11])=[N:9][NH:10][C:6]=2[CH:5]=[CH:4][N:3]=1.[H-].[Na+].Br[CH:15]([CH3:17])[CH3:16]>CN(C=O)C>[Cl:1][C:2]1[C:7]2[C:8]([I:11])=[N:9][N:10]([CH:15]([CH3:17])[CH3:16])[C:6]=2[CH:5]=[CH:4][N:3]=1A solution of 4-chloro-3-iodo-1H-pyrazolo[4,3-c]pyridine (103) (50 mg, 0.179 mmol) in DMF (1 mL) was cooled to 0° C., NaH (8.6 mg, 1.2 eq, 0.215 mmol) was added slowly and then 2-bromopropane was added dropwise. The solution was stirred overnight at room temperature. The mixture was concentrated in vacuo. The crude product was then purified by column chromatography using a gradient of CH2Cl2 in hexanes to afford 4-chloro-3-iodo-1-isopropyl-1H-pyrazolo[4,3-c]pyridine (301) (30 mg, 53% yield) as a white solid.
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