m-Chloroperbenzoic acid → 2-(2,6-Dichloro-4-fluorophenyl)-7-fluoro-2H-pyrazolo[4,3-c]pyridine-5-oxide

Participants

Reaction Conditions

Reaction Steps

To a cooled (0° C.) solution of 2-(2,6-dichloro-4-fluorophenyl)-7-fluoro-2H-pyrazolo[4,3-c]pyridine (3.37 g, 11.2 mmol) in DCM (50 mL) under nitrogen, was added mCPBA (2.9 g, 16.8 mmol). The reaction mixture was stirred at 0° C. for 2 hours, warmed to room temperature, and stirred for a further 5 hours. The reaction was washed with sodium thiosulfate (sat. aq.), sodium hydrogen carbonate (sat. aq.), and brine. The organic layer was then dried over anhydrous sodium sulphate and concentrated under reduced pressure. The residue was purified by trituration with diethyl ether to afford the title compound as an off-white solid (2.98 g, 84% yield). LCMS (Method D): RT=2.48 min, m/z: 316 [M+H+].

Provenance & Evidence