Dimethylformamide → N-{4-[5-(trifluoromethyl)benzoxazole-2-yl]pyridin-3-yl}phthalimide

HRID 1913629Notes

Reaction equation

F[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.[K].[C:22]1(=[O:32])[NH:26][C:25](=[O:27])[C:24]2=[CH:28][CH:29]=[CH:30][CH:31]=[C:23]12.CN(C=O)C>O>[F:18][C:17]([F:20])([F:19])[C:14]1[CH:15]=[CH:16][C:10]2[O:9][C:8]([C:7]3[CH:6]=[CH:5][N:4]=[CH:3][C:2]=3[N:26]3[C:25](=[O:27])[C:24]4=[CH:28][CH:29]=[CH:30][CH:31]=[C:23]4[C:22]3=[O:32])=[N:12][C:11]=2[CH:13]=1

Participants

Conditions

Temperature: 120 °C

Procedure

A mixture of 1.41 g of 2-(3-fluoropyridin-4-yl)-5-(trifluoromethyl)benzoxazole, 1.85 g of phthalimide potassium and 8 ml of DMF was stirred while heating at 120° C. After six hours, 0.92 g of phthalimide potassium was added and stirred while heating at 140° C. for further one hour. The reaction mixture was cooled to room temperature, and then water was added to the reaction mixture, which followed by extraction with ethyl acetate twice. The combined organic layers were washed with water and a saturated sodium chloride solution, sequentially, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to give 1.26 g of N-{4-[5-(trifluoromethyl)benzoxazole-2-yl]pyridin-3-yl}phthalimide.

Workup

stirringstirred
temperaturewhile heating at 140° C. for further one hour
temperatureThe reaction mixture was cooled to room temperature
extractionfollowed by extraction with ethyl acetate twice
washThe combined organic layers were washed with water
dry with materiala saturated sodium chloride solution, sequentially, dried over anhydrous magnesium sulfate
concentrationconcentrated under reduced pressure

Sources & evidence

ORD record: ord-5d110e02a10741c8a538c2d146d63f16
Source dataset: uspto-grants-2013_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08609705B2

Reaction notes

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