Sodium Hydroxide → 6-bromo-1-cyclobutyl-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 (5 equivalent) was added to a solution of ethyl 6-bromo-1-cyclobutyl-1H-pyrazolo[3,4-b]pyridine-4-carboxylate (1 equivalent) in EtOH (10 times by volume) 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. Extraction was carried out using EtOAc; the combined organic layers were washed with water, brine and dried over anhydrous Na2SO4; filtered and concentrated under reduced pressure. The residue was, then, dissolved in DMSO (10 times by volume) and 3-(aminomethyl)-4,6-dimethylpyridin-2(1H)-one (2 equivalents) was added to it. The reaction mixture was stirred at room temperature for 15 min before PYBOP (1.5 equivalents) was added to it and stirring was continued for 5 to 16 h. After completion of the reaction, water was added to it and extraction was carried out using EtOAc. The combined organic layers were washed with water; brine; dried over anhydrous Na2SO4; filtered and concentrated under reduced pressure. The residue was purified by silica gel column chromatography followed by ether wash to provide the desired intermediate.

Provenance & Evidence