m-Chloroperbenzoic acid → 6-((6-fluoro-3H-imidazo[4,5-b]pyridin-3-yl)methyl)-2-(methylsulfinyl)benzo[d]oxazole

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 6-((6-fluoro-3H-imidazo[4,5-b]pyridin-3-yl)methyl)-2-(methylthio)benzo[d]oxazole (595 mg, 1.89 mmol) from the previous step in DCM (10 mL) at 0° C. was added 70% meta-chloroperbenzoic acid (425 mg, 2.46 mmol). The reaction mixture was stirred at 0° C. for 2 h. The reaction mixture was washed sequentially with aq sodium sulfite and brine. The organic layer was separated, dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified by silica gel flash chromatography eluting with 50% ethyl acetate in petroleum ether to afford 6-((6-fluoro-3H-imidazo[4,5-b]pyridin-3-yl)methyl)-2-(methylsulfinyl)benzo[d]oxazole (509 mg, 82%). 1H NMR (300 MHz, DMSO-d6): δ 8.73 (s, 1H), 8.40 (s, 2H), 7.53 (d, J=7.2 Hz, 1H), 7.37 (s, 1H), 7.15 (d, J=4.5 Hz, 1H), 5.69 (s, 2H), 3.18 (s, 3H); LCMS (ESI) m/z 331 (M+H)+.

Provenance & Evidence