Synthesis method of trifluoroethyl benzofuran compound

The invention relates to a preparation method of a trifluoroethyl benzofuran compound, which comprises the following steps: by taking trifluoromethyl propargyl alcohol and a phenol compound as reaction substrates, bis (trifluoromethanesulfonimide) silver as a catalyst and hexane as a reaction solvent, stirring and reacting for 12 hours at 70 DEG C in an argon atmosphere; after the reaction is finished, filtering a reaction solution, washing with a saturated sodium chloride solution, extracting with ethyl acetate, drying layers with anhydrous sodium sulfate after extraction, then removing a solvent with a rotary evaporator to obtain a residue, performing column chromatography separation on the residue through a silica gel column, and leaching with an eluent to obtain a crude product; collecting effluent containing the target product, combining the effluent, and removing the solvent through vacuum concentration to obtain the target product. The method has the advantages of simple and easily available raw materi