As a conclusion, we have developed an efficient reaction in mild
conditions for amidation of potassium alkyltrifluoroborate salts
from nitriles and mediated by copper acetate and boron trifluoride.
This transformation was realized at room temperature without the
need of adding ligand for the copper. We supposed that the
mechanism involves an oxidative nucleophilic substitution. The
possible formation of a benzylic carbocation intermediate gives
new possibility for the functionalization of boronic derivatives.