Stereo- and regioselective ring opening of alkenyl aziridines with metal halides

The reaction of protected alkenyl aziridines (R = Pr, Me3C,
cyclohexyl) with lithium halides in presence of Amberlyst 15 afforded ring-opened products stereo- and regioselectively and in high yields. The following treatment of the latter with silica gel produced the corresponding oxazolidin-2-ones.