反应详情

4-Bromo-2-methoxyfluorobenzene (obtainable from 5-bromo-2-fluorophenol by reaction with dimethyl sulfate under basic conditions) is reacted with trimethylsilylacetylene with catalysis by bis(triphenylphosphine)palladium(II) chloride and copper(I) iodide in dimethylamine at 20° C. to give 1-(4-fluoro-3-methoxyphenyl)-2-(trimethylsilyl)ethyne; after filtration chromatography (SiO2/dichloromethane), the crude product is stirred in methanol for 1 hour at 20° C. with addition of 1 N aqueous NaOH solution. Removal of the solvent by distillation and chromatography (SiO2/dichloromethane) gives 4-ethynyl-3-methoxyfluorobenzene.