反应详情

To a stirred solution of 6-((6-bromo-3H-imidazo[4,5-b]pyridin-3-yl)methyl)-2-(methylthio)benzo[d]oxazole (460 mg, 1.23 mmol) from Step 2 of this Example in DCM (25 mL) at 0° C. was added 70% meta-chloroperbenzoic acid (333 mg, 1.35 mmol), and the mixture was allowed to warm to rt and stirred for a further 30 min. To the mixture was added saturated aq NaHCO3 and the organic layer was separated. The aqueous layer was re-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-((6-bromo-3H-imidazo[4,5-b]pyridin-3-yl)methyl)-2-(methylsulfinyl)benzo[d]oxazole (481 mg, 100%) as a cream solid which did not require further purification. 1H NMR (300 MHz, DMSO-d6) δ 8.73 (s, 1H), 8.40-8.50 (m, 2H), 7.84-7.95 (m, 2H), 7.50 (d, J=8.3 Hz, 1H), 5.68 (s, 2H), 3.18 (s, 3H). LCMS (ESI) m/z 391 and 393 (M+H)+.

1. customat 0° C.
2. customthe organic layer was separated
3. extractionThe aqueous layer was re-extracted with DCM
4. washthe combined organic layers were washed with saturated aq NaHCO3
5. customThe organic layer was separated
6. dry with materialdried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure