Toluene → 5-(3-fluorophenyl)benzofuran-3(2H)-one

Participants

Reaction Conditions

Reaction Steps

Cesium carbonate (612 mg, 1.88 mmol) was added to a solution of 5-bromobenzofuran-3(2H)-one (200 mg, 0.939 mmol), (3-fluorophenyl)boronic acid (263 mg, 1.88 mmol) and toluene (20 mL) in a 50 mL Schlenk tube. A nitrogen atmosphere was established by evacuating and refilling with nitrogen (3×), then tetrakis(triphenylphosphine)palladium (0) (11 mg, 0.01 mmol) was added to the reaction. The flask was sealed and heated in a 80° C. oil bath overnight. The resulting mixture was cooled to room temperature. The reaction was then diluted with ethyl acetate and filtered through celite. Ethyl acetate (30 mL) was used to wash the flask and the combined organic filtrate was concentrated. The resulting crude residue was purified on a Teledyne-Isco Combiflash machine (40 g column, hexanes→100% ethyl acetate/hexanes, gradient), to afford 212 mg (99%) of 5-(3-fluorophenyl)benzofuran-3(2H)-one.

Provenance & Evidence