A facilepreparation of allylictrifluoromethylthioethers was achieved by using a copper reagent. The reaction of (bpy)Cu(SCF3) with various allylicbromides afforded the desired trifluoromethylthiolation products in good to excellent yields with high stereo‐ and regioselectivity. Common functional groups such as alkyl, alkoxy, trifluoromethyl, nitro, halides and geranyl are well tolerated.
A new method has been developed for the copper-mediated trifluoromethylthiolation of allylic halides by using potassium fluoride, elemental sulfur, and (trifluoromethyl)trimethylsilane in anhydrous N,N-dimethylformamide. This protocol provides facile access to a variety of allylic trifluoromethylthioethers in moderate to good yields under mild, ligand-free reaction conditions.