Formaldehyde → HCID 59278099, compound

Participants

Reaction Steps

To a solution of 1-(4-fluorophenyl)-1H-pyrazolo[3,4-c]pyridine-4-carboxylic acid (1-piperidin-4-yl-propyl)-amide (0.10 mg, 0.26 mmol) and 37% aqueous formaldehyde (157 μL, 2.1 mmol) in MeOH (3 mL) was added sodium triacetoxyborohydride (83 mg, 0.39 mmol). After 2 hours, the reaction was quenched with saturated aqueous sodium bicarbonate (5 mL) and extracted with EtOAc (3×50 mL). The combined organic layers were washed with brine, dried over sodium sulfate and concentrated. The residue was purified by reversed-phase HPLC chromatography (Sunfire PrepC18 OBD 5 mM 30×150 mm column) eluting with a gradient of 5-75% acetonitrile in water (0.1% TFA). The fractions from the column were concentrated to remove acetonitrile, made basic with saturated aqueous sodium carbonate and extracted with EtOAc. The organic layer was dried and concentrated to afford the title compound.

Provenance & Evidence