Therefore, an alternative protocol described by Shore and co-authors was considered (AgNO3 (20 mol.%), (NH4)2S2O8 (5 eq.), MeCN -H2O, 60 C, 8 h). After some additional experiments (Entries 6-10), an optimized version of the synthetic protocol with increased quantities of radical precursor 3{1} (3 eq), (NH4)2S2O8 as the stoichiometric oxidant, and CH3CN -H2O as the solvent was elaborated (42% isolated yield, Entry 9) and therefore implemented in further studies with carboxylic acids as the radical sources. Notably, this protocol did not give significant advantages in the case of trifluoroborates.