1-(Hydroxymethyl)-4-propylpyrrolidin-2-one → 1-[(5-bromo-2H-pyrazolo[3,4-b]pyridin-2-yl)methyl]-4-propylpyrrolidin-2-one

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A solution of 5-bromo-1H-pyrazolo[3,4-b]pyridine x80 (1 g, 1 eq, 5.04 mmol) and 1-(hydroxymethyl)-4-propylpyrrolidin-2-one x2 (1.58 g, 2 eq, 10.08 mmol) in trifluoroacetic acid (20 ml) is refluxed for 4 hours. The reaction mixture is poured on crushed ice, on saturated NaHCO3 aqueous solution, and the aqueous phase is extracted with dichloromethane. The cumulated organic layers are dried over MgSO4, filtered, evaporated under reduced pressure. The crude product is purified by preparative chromatography on silicagel affording 1-[(5-bromo-2H-pyrazolo[3,4-b]pyridin-2-yl)methyl]-4-propylpyrrolidin-2-one 291 as a white solid.

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