Reactions of methylenecyclopropanes and vinylidenecyclopropanes with N-fluorodibenzenesulfonimide

Methylenecyclopropanes and vinylidenecyclopropanes undergo ring-opening reactions with N-fluorodibenzenesulfonimide (NFSI) upon heating at 60 °C in tetrahydrofuran to give the corresponding fluorinated derivatives 2 and 6 in good to excellent yields.