m-Chloroperbenzoic acid → 6-((5-bromo-6-chloro-1H-benzo[d]imidazol-1-yl)methyl)-2-(methylsulfinyl)benzo[d]oxazole

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Reaction Steps

A solution of 6-((5-bromo-6-chloro-1H-benzo[d]imidazol-1-yl)methyl)-2-(methylthio)benzo[d]oxazole (554 mg, 1.80 mmol) and m-CPBA (403 mg, 2.34 mmol) in DCM (18 mL) was stirred at 0° C. for 3 h. The reaction mixture was washed with aqueous Na2S2O3 and brine. The organic layer was dried over Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by silica gel chromatography eluting with 1:5 petroleum ether/ethyl acetate to give 6-((5-bromo-6-chloro-1H-benzo[d]imidazol-1-yl)methyl)-2-(methylsulfinyl)benzo[d]oxazole (510 mg, 87.5%) as a yellow solid. 1H NMR (300 MHz, DMSO-d6) δ 8.59 (s, 1H), 8.08 (s, 1H), 8.04 (s, 1H), 7.97 (s, 1H), 7.90 (d, J=8.7 Hz, 1H), 7.50 (d, J=9.3 Hz, 1H), 5.69 (s, 2H), 3.18 (s, 3H). LCMS (ESI) m/z 424 (M+H)+.

Provenance & Evidence