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

Temperatur

80 °C

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).

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

ORD-Eintrag

ord-33ca3d74cbba43e99cdd2e225912df57

Quelldatensatz

uspto-grants-2015_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09211281B2