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

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Reaction Conditions

Reaction Steps

To a stirred solution of 6-((3H-imidazo[4,5-b]pyridin-3-yl)methyl)-2-(methylthio)benzo[d]oxazole (290 mg, 0.979 mmol) from Step 4 of this Example in DCM (25 mL) at 0° C. was added 70% meta-chloroperbenzoic acid (582 mg, 2.36 mmol), and the mixture was stirred at 0° C. for 2.5 h. To the mixture was added saturated aq NaHCO3 and the organic layer was separated. The aqueous layer was extracted with DCM and the combined organic layers were washed with saturated aq NaHCO3. The organic layer was separated, dried over MgSO4, filtered, and concentrated under reduced pressure to afford 6-((3H-imidazo[4,5-b]pyridin-3-yl)methyl)-2-(methylsulfinyl)benzo[d]oxazole (305 mg, 100%) as a solid which did not require further purification. 1H NMR (300 MHz, DMSO-d6) δ 8.67 (s, 1H), 8.38 (d, J=4.5 Hz, 1H), 8.11 (d, J=7.2 Hz, 1H), 7.84-7.94 (m, 2H), 7.52 (d, J=8.3 Hz, 1H), 7.30 (dd, J=4.8, 8.0 Hz, 1H), 5.69 (s, 2H), 3.18 (s, 3H). LCMS (ESI) m/z 313 (M+H)+.

Provenance & Evidence