Scheme 2. Substrate scope for the catalytic C–H propargylic functionalization to form alkylation products 3: standard conditions: 1 (0.30 mmol), 2 (1.5 equiv.), Ph3C+BF4− (1.7 equiv.), sym-collidine (1.8 equiv.), [Cp*Fe(CO)2(thf)]+BF4− (20 mol%), PhCF3 (0.2 M), 60 °C, 48 h. aCHCl3 (0.2 M) was used as the solvent. NPhth = phthalimide. Fmoc = fluorenylmethyloxycarbonyl.
