Ethanol → HCID 22282577, compound

Participants

Reaction Steps

4-[(trifluoromethyl)sulfonyl]-2H-chromene from reaction 34a (1.78 g, 6.47 mmol) and 4-(methoxy carbonylphenyl) boronic acid (1.0 g, 5.6 mmol) were dissolved in ethanol (15 mL) and toluene (30 mL) under nitrogen at room temperature. Then lithium chloride (0.52 g, 12.35 mmol) and 2.65 M potassium carbonate (4.2 mL, 11.0 mmol) were added. Nitrogen was bubbled through the reaction for 15 minutes before the tetrakis(triphenylphosphine)palladium(0) (0.35 g, 0.31 mmol) was added. The reaction was heated to reflux for 3 h, allowed to cool then partitioned between ethyl acetate and water. The organic layer was washed with water, brine, dried over magnesium sulfate, and was concentrated. The product was purified by chromatography on silica gel eluting with ethyl ether:hexane (20:80, v:v) to give methyl 4-(2H-chromen-4-yl)benzoate (1.53 g, 99%) as a yellow solid.

Provenance & Evidence