Pyridine → HCID 86703405, compound

Participants

Reaction Steps

Trifluoromethanesulfonic anhydride (5.23 g, 18.5 mmol) was added to a cooled solution of ethyl 6-hydroxy-1-isopropyl-1H-pyrazolo[3,4-b]pyridine-4-carboxylate (4.2 g, 16.9 mmol) and pyridine (1.46 g, 18.5 mmol) in DCM (60 mL); and it was allowed to stirred at room temperature for 2 h. After completion of the reaction, saturated NaHCO3 solution (60 mL) was added to it and extraction was carried out using DCM (30 mL×3). The combined organic layers were washed with water (100 mL); brine (100 mL); dried over anhydrous Na2SO4; filtered and concentrated under reduced pressure. The residue was finally purified by silica gel column chromatography to provide pure the desired intermediate (5 g, 77.8% yield).

Provenance & Evidence