Toluene → HCID 57668051, compound

Participants

Reaction Conditions

Reaction Steps

To a mixed solution of toluene 2.0 mL, ethanol 0.6 mL and water 0.4 mL of methyl 4-bromo-2-(4-fluoroanilino)benzoate 70 mg were added thiophene-2-boronic acid 42 mg, sodium carbonate 64 mg and tetrakis(triphenylphosphine)palladium(0) 13 mg at room temperature, and it was stirred under application of pressure at 160° C. for 5 minutes. After the reaction mixture was cooled to room temperature, insoluble matter was filtrated, and ethyl acetate and 0.5 mol/L hydrochloric acid were added to it. The organic layer was separated and collected,dried over anhydrous magnesium sulfate after sequential washing with 1.0 mol/L hydrochloric acid and saturated sodium chloride aqueous solution, and the solvent was removed under reduced pressure. The obtained residue was refined by silica gel column chromatography [Trikonex company, Flash Tube 2008, eluent; hexane] to give methyl 2-(4-fluoroanilino)-4-(thiophen-2-yl)benzoate. 2.0 mol/L Sodium hydroxide aqueous solution 1.0 mL was added to ethanol 7.0 mL solution of the obtained methyl 2-(4-fluoroanilino)-4-(thiophen-2-yl)benzoate, and it was stirred at room temperature for 1 hour and 30 minutes. 0.5 mol/L Hydrochloric acid and ethyl acetate were added to the reaction mixture, the organic layer was separated and collected, and the solvent was removed under reduced pressure. The obtained residue was refined by reversed-phase silica gel column chromatography [eluent; 50-100% acetonitrile/0.1% trifluoroacetic acid aqueous solution] to give 2-(4-fluoroanilino)-4-(thiophen-2-yl)benzoic acid 3.5 mg of pale yellow solid.

Provenance & Evidence