Sodium periodate → 3,5-Dichloro-4-[7-fluoro-4-(6-methylpyrimidin-4-ylamino)pyrazolo[4,3-c]pyridin-2-yl]benzaldehyde

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Reaction Steps

To a mixture of [2-(2,6-dichloro-4-vinylphenyl)-7-fluoro-2H-pyrazolo[4,3-c]pyridin-4-yl]-(6-methylpyrimidin-4-yl)amine (193 mg, 0.47 mmol) in acetone (10 mL) and water (2.5 mL) was added osmium (VIII) oxide (2.5% wt in tert-butanol, 0.465 mL), followed by sodium periodate (257 mg, 1.2 mmol) and the reaction mixture was stirred at room temperature overnight. The resultant mixture was partitioned between ethyl acetate and water and the layers were separated. The organic layer was washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by silica gel flash chromatography (80% ethyl acetate in cyclohexane) to afford the title compound as a yellow solid (129 mg, 66% yield). 1H NMR (400 MHz, DMSO-d6): δ 10.77 (s, 1H), 10.10 (s, 1H), 9.35 (d, J=2.6 Hz, 1H), 8.70 (s, 1H), 8.37 (s, 1H), 8.31 (s, 2H), 8.01 (d, J=3.5 Hz, 1H), 2.45 (s, 3H).

Provenance & Evidence