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

HRID 1848030Notes

Reaction equation

[N:1]1[C:9]2[C:4](=[N:5][CH:6]=[CH:7][CH:8]=2)[N:3]([CH2:10][C:11]2[CH:21]=[CH:20][C:14]3[N:15]=[C:16]([S:18][CH3:19])[O:17][C:13]=3[CH:12]=2)[CH:2]=1.ClC1C=CC=C(C(OO)=[O:30])C=1.C([O-])(O)=O.[Na+]>C(Cl)Cl>[N:1]1[C:9]2[C:4](=[N:5][CH:6]=[CH:7][CH:8]=2)[N:3]([CH2:10][C:11]2[CH:21]=[CH:20][C:14]3[N:15]=[C:16]([S:18]([CH3:19])=[O:30])[O:17][C:13]=3[CH:12]=2)[CH:2]=1

Participants

Conditions

Temperature: 0 °C

Procedure

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)+.

Workup

customat 0° C.
customthe organic layer was separated
extractionThe aqueous layer was extracted with DCM
washthe combined organic layers were washed with saturated aq NaHCO3
customThe organic layer was separated
dry with materialdried over MgSO4
filtrationfiltered
concentrationconcentrated under reduced pressure

Sources & evidence

ORD record: ord-144e8d340318418a9497e3255e99df7c
Source dataset: uspto-grants-2015_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08952058B2

Reaction notes

Loading…