Potassium Carbonate → Ethyl 1-(3,4-difluorophenyl)-4[3-(ethoxycarbonyl)phenyl]-1H-pyrazole-3-carboxylate

Participants

Reaction Steps

180 mg (0.54 mmol) of ethyl 4-bromo-1-(3,4-difluorophenyl)-1H-pyrazole-3-carboxylate, 156.7 mg (0.59 mmol) of methyl 3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoate, 158 mg (1.14 mmol) of potassium carbonate, 5.07 mg (0.011 mmol) of 2,2-dicyclohexylphosphino-2″,6″-diisopropoxybiphenyl and 1.22 mg (0.005 mmol) of palladium (II)acetate were suspended in 5 ml of ethanol and heated at the boil for 4 h. After cooling to room temperature, the solvent was removed under reduced pressure, the residue was dissolved in water and dichloromethane, the phases were separated and the organic phase was dried over magnesium sulfate. The crude product was purified by chromatography (ethyl acetate:n-heptane 1:4). This gave 84 mg (37%) of the desired product. 1H-NMR (400 MHz, CDCl3 δ, ppm) 8.15 (s, 1H); 8.05 (d, 1H); 7.96 (s, 1H); 7.74-7.69 (m, 2H); 7.53-7.47 (m, 2H); 7.28 (m, 1H); 4.48-4.34 (m, 4H); 1.43 (t, 3H); 1.29 (t, 3H)

Provenance & Evidence