Sodium Hydroxide → 6-bromo-N-((4,6-dimethyl-2-oxo-1,2-dihydropyridin-3-yl)methyl)-1H-pyrazolo[3,4-b]pyridine-4-carboxamide

Participants

Reaction Conditions

Reaction Steps

Aqueous NaOH (1.11 g, 27.88 mmol) was added to a solution of ethyl 6-bromo-1H-pyrazolo[3,4-b]pyridine-4-carboxylate (5 g, 18.58 mmol) in EtOH (50 mL) and stirred at 60° C. for 1 h. After completion of the reaction, ethanol was removed under reduced pressure and it was acidified using 10% citric acid solution. Solid obtained was filtered and dried under reduced pressure to obtain corresponding acid. The crude acid (4.4 g, 18.2 mmol) was then dissolved in DMSO (20 mL) and 3-(aminomethyl)-4,6-dimethylpyridin-2(1H)-one (5.55 g, 36.51 mmol) was added to it. The reaction mixture was stirred at room temperature for 15 min before PYB OP (14.24 g, 27.38 mmol) was added to it and stifling was continued overnight. After completion of the reaction, reaction mass was poured into ice to obtain a solid, which was filtered and washed with acetonitrile followed by ether to provide the desired intermediate (4 g, 58.5%).

Provenance & Evidence