反应详情

N-[3,5-Bis(trifluoromethyl)phenyl]-2-hydroxy-5-iodobenzamide (200 mg, 0.42 mmol) was dissolved in 1,2-dimethoxyethane (3 mL). Tetrakis(triphenylphosphine)palladium (16 mg, 0.0014 mmol) was added under argon atmosphere, and the mixture was stirred at room temperature for 5 minutes. Then dihydroxyphenylborane (57 mg, 0.47 mmol) and 1M sodium carbonate (1.3 mL) were added and refluxed for 2 hours. After cooling to room temperature, the reaction mixture was poured into diluted hydrochloric acid and extracted with ethyl acetate. After the ethyl acetate layer was washed with water and brine one after another, dried over anhydrous sodium sulfate, the solvent was evaporated under reduced pressure. The obtained residue was purified by column chromatography on silica gel (n-hexane:ethyl acetate=6:1→3:1) to give the title compound (109 mg, 61.1%) as a white crystal.

1. temperaturerefluxed for 2 hours
2. temperatureAfter cooling to room temperature
3. extractionextracted with ethyl acetate
4. washAfter the ethyl acetate layer was washed with water and brine one after another,
5. dry with materialdried over anhydrous sodium sulfate
6. customthe solvent was evaporated under reduced pressure
7. customThe obtained residue was purified by column chromatography on silica gel (n-hexane:ethyl acetate=6:1→3:1)