Boron Trifluoride Etherate Functioning as a Fluorine Source in an Iodosobenzene-Mediated Intramolecular Aminofluorination of Homoallylic Amines

A widely used Lewis acid BF3·Et2O was
shown to be capable of acting as an efficient fluorinating agent in
an intramolecular aminofluorination reaction of homoallylic amines
to provide 3-fluoropyrrolidines mediated by a commercially available
hypervalent iodine­(III) reagent PhIO at room temperature. A mechanism
involving a carbocation intermediate was proposed on the basis of
several experimental evidence.