Potassium Carbonate → 5-(4-Fluorophenyl)-7-isopropyl-2,2-dimethyl-4-oxochroman-6-carbaldehyde

Participants

Reaction Steps

A solution of 800 mg (2.03 mmol) of 6-formyl-7-isopropyl-2,2-dimethyl-4-oxo-3,4-dihydro-2H-chromen-5-yl trifluoromethanesulfonate (Example 19A), 369 mg (2.64 mmol) of 4-fluorophenyl-boronic acid, 164 mg (142 μmol) of tetrakis(triphenylphosphine)palladium and 731 mg (3.45 mmol) of potassium carbonate and 10 ml of degassed dioxane is stirred at 100° C. overnight. After cooling to room temperature, ammonium chloride solution is added and the mixture is extracted twice with ethyl acetate. After drying of the combined organic phases over sodium sulfate, the solvent is removed under reduced pressure and the residue is purified by column chromatography (mobile phase: gradient cyclohexane→cyclohexane/ethyl acetate 20:1).

Provenance & Evidence