3,5-Dibromopyridine → 3-Bromo-5-(3-fluorophenylethynyl)-pyridine

Participants

Reaction Conditions

Reaction Steps

Add 1-ethynyl-3-fluorobenzene (250 mg, 2.11 mmol) to a mixture of 3,5-dibromopyridine (500 mg, 2.11 mmol) in triethylamine (4 mL) containing bis(triphenylphosphine)palladium (II) dichloride (28 mg, 0.04 mmol) and copper (I) iodide (15 mg, 0.08 mmol) and heat at 70° C. for 2 h. Cool to room temperature, dilute with ethyl acetate and an aqueous solution of ammonium chloride and separate the resulting layers. Wash the organic layer with an aqueous saturated solution of sodium chloride, dry (magnesium sulfate), filter and concentrate. Purify by silica gel chromatography, eluting with 0.5% ethanol in 50:50 dichloromethane:hexanes to give the title compound (160 mg, 28%).

Provenance & Evidence