Acetic Acid → 3-{2-Chloro-4-fluoro-5-[2,6-dioxo-4-(trifluoromethyl)-1,2,3,6-tetrahydropyridin-1-yl]phenoxy}-2-(methoxycarbonyl)methoxypyridine

HRID 493949Notes

Reaction equation

[Cl:1][C:2]1[C:7]([O:8][C:9]2[C:10]([O:15][CH2:16][C:17]([O:19][CH3:20])=[O:18])=[N:11][CH:12]=[CH:13][CH:14]=2)=[CH:6][C:5]([NH:21][C:22](=[O:30])[CH2:23][C:24]([C:26]([F:29])([F:28])[F:27])=O)=[C:4]([F:31])[CH:3]=1.[C:32](O)(=[O:34])[CH3:33].[O-]C#N.[Na+]>O>[Cl:1][C:2]1[CH:3]=[C:4]([F:31])[C:5]([N:21]2[C:32](=[O:34])[CH:33]=[C:24]([C:26]([F:27])([F:28])[F:29])[CH2:23][C:22]2=[O:30])=[CH:6][C:7]=1[O:8][C:9]1[C:10]([O:15][CH2:16][C:17]([O:19][CH3:20])=[O:18])=[N:11][CH:12]=[CH:13][CH:14]=1

Participants

Conditions

Temperature: 50 °C

Procedure

To a mixture of 0.71 g of N-[4-chloro-2-fluoro-5-{2-(methoxycarbonyl)methoxy-3-pyridyloxy}phenyl]trifluoroacetoacetamide and 2 ml of acetic acid was added sodium cyanate, and the mixture was stirred at 50° C. for 1 hour and then at 110° C. for 1.5 hours. After cooling, water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated aqueous sodium bicarbonate solution, saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate, and then concentrated. The residue was subjected to silica gel column chromatography to give 0.30 g of 3-{2-chloro-4-fluoro-5-[2,6-dioxo-4-(trifluoromethyl)-1,2,3,6-tetrahydropyridin-1-yl]phenoxy}-2-(methoxycarbonyl)methoxypyridine.

Workup

waitat 110° C. for 1.5 hours
temperatureAfter cooling
extractionthe mixture was extracted with ethyl acetate
washThe organic layer was washed with saturated aqueous sodium bicarbonate solution, saturated aqueous sodium chloride solution
dry with materialdried over anhydrous magnesium sulfate
concentrationconcentrated

Sources & evidence

ORD record: ord-d7a37341349347bfb903dd4122ca1282
Source dataset: uspto-grants-2009_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07538072B2

Reaction notes

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