Chloroform → 3-bromo-4-[5-(trifluoromethyl)benzoxazole-2-yl]pyridine N-oxide

HRID 884849

Reaction equation

[Br:1][C:2]1[CH:3]=[N:4][CH:5]=[CH:6][C:7]=1[C:8]1[O:9][C:10]2[CH:16]=[CH:15][C:14]([C:17]([F:20])([F:19])[F:18])=[CH:13][C:11]=2[N:12]=1.C(Cl)(Cl)Cl.ClC1C=CC=C(C(OO)=[O:33])C=1>C(OCC)(=O)C>[Br:1][C:2]1[CH:3]=[N+:4]([O-:33])[CH:5]=[CH:6][C:7]=1[C:8]1[O:9][C:10]2[CH:16]=[CH:15][C:14]([C:17]([F:20])([F:18])[F:19])=[CH:13][C:11]=2[N:12]=1

Participants

Conditions

Temperature: 50 °C

Procedure

To a mixture of 0.50 g of 2-(3-bromopyridin-4-yl)-5-(trifluoromethyl)benzoxazole and 5 ml of chloroform, 0.58 g of 65% m-chloroperbenzoic acid was added. The reaction mixture was stirred while heating at 50° C. for 1.5 hours. The reaction mixture was cooled to room temperature, then diluted with ethyl acetate, and washed with a saturated aqueous solution of sodium hydrogencarbonate (twice) and a saturated sodium chloride solution, sequentially. The organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to give 0.37 g of 3-bromo-4-[5-(trifluoromethyl)benzoxazole-2-yl]pyridine N-oxide (hereinafter, referred to as “active compound 28”).

Workup

additionwas added
temperatureThe reaction mixture was cooled to room temperature
washwashed with a saturated aqueous solution of sodium hydrogencarbonate (twice) and a saturated sodium chloride solution
dry with materialThe organic layer was dried over anhydrous sodium sulfate
concentrationconcentrated under reduced pressure

Sources & evidence

ORD record: ord-9cd0b81097e24cfc943b84b8243efcf9
Source dataset: uspto-grants-2012_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08242133B2

Linked notes

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