Citric Acid → N-[3,5-Bis(trifluoromethyl)phenyl]-2-hydroxy-5-[(trimethylsilyl)ethynyl]benzamide

Participants

Reaction Conditions

Reaction Steps

N-[3,5-Bis(trifluoromethyl)phenyl]-2-hydroxy-5-iodobenzamide (950 mg, 2 mmol) and trimethylsilylacetylene (246 mg, 2.5 mmol) were dissolved in triethylamine (2 mL) and N,N-dimethylformamide (4 mL). Tetrakis(triphenylphosphine)palladium (23 mg, 0.02 mmol) and cuprous iodide (4 mg, 0.02 mmol) were added under argon atmosphere, and the mixture was stirred at 40° C. for 2 hours. After cooling to room temperature, the reaction mixture was poured into ethyl acetate (100 mL) and 1 N citric acid (100 mL), stirred, and filtered through celite. After the ethyl acetate layer was washed with water and brine one after another, dried over anhydrous magnesium sulfate, the solvent was evaporated under reduced pressure. The obtained residue was purified by column chromatography on silica gel (n-hexane:ethyl acetate=19:1) to give a light orange solid. This was crystallized by n-hexane to give the title compound (286 mg, 32.1%) as a white crystal.

Provenance & Evidence