sequence. The interaction of pentafluorophenylmagnesiumbromide with conjugate nitroalkenes is described. The optimized conditions involve performing the reaction either in diethyl ether in the presence of chlorotrimethylsilane or in a tetrahydrofuran–diethyl ether solvent mixture. The addition products can be transformed into 4,5,6,7-tetrafluoroindolines by means of a reduction and cyclization sequence