Potassium Carbonate → 2-(Trifluoromethoxy)-4-vinylbenzoic acid

HRID 1502965Notes

Reaction equation

Br[C:2]1[CH:10]=[CH:9][C:5]([C:6]([OH:8])=[O:7])=[C:4]([O:11][C:12]([F:15])([F:14])[F:13])[CH:3]=1.[CH:16]([B-](F)(F)F)=[CH2:17].[K+].C(=O)([O-])[O-].[K+].[K+]>CS(C)=O.O>[F:13][C:12]([F:15])([F:14])[O:11][C:4]1[CH:3]=[C:2]([CH:16]=[CH2:17])[CH:10]=[CH:9][C:5]=1[C:6]([OH:8])=[O:7]

Participants

Conditions

Temperature: 80 °C

Procedure

To a stirred solution of 4-bromo-2-(trifluoromethoxy)benzoic acid (1 g, 3.67 mmol) in DMSO (20 mL) was added potassium vinyltrifluoroborate (1.47 g, 11.02 mmol) and potassium carbonate (1.52 g, 11.02 mmol). The reaction mixture was degassed with argon for 30 min Bistriphenylphosphine(diphenylphosphinoferrocene)palladium dichloride (0.13 g, 0.18 mmol) was added and the reaction mixture was heated to 80° C. for 1 h. The reaction mixture was diluted with water (100 mL), extracted with ethyl acetate (2×50 mL), washed with brine, and dried over Na2SO4. Concentration under reduced pressure furnished the crude compound which was purified by flash column chromatography to afford the product as pale yellow gummy material (0.4 g, 47%): 1H NMR (400 MHz, CDCl3) δ 8.05 (d, J=8.1 Hz, 1H), 7.44 (d, J=1.8 Hz, 1H), 7.35 (s, 1H), 6.78 (dd, J=17.4.1, 11.1 Hz, 1H), 5.92 (d, J=17.4 Hz, 1H), 5.51 (d, J=10.8 Hz, 1H); ESIMS m/z 232.97 ([M+H]E).

Workup

additionwas added
extractionextracted with ethyl acetate (2×50 mL)
washwashed with brine
dry with materialdried over Na2SO4
concentrationConcentration under reduced pressure
customfurnished the crude compound which
customwas purified by flash column chromatography

Sources & evidence

ORD record: ord-33ca3d74cbba43e99cdd2e225912df57
Source dataset: uspto-grants-2015_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09211281B2

Reaction notes

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