3 undergo in the presence of trimethylsilyl chloride and catalytic amounts of FeCl 2 an intramolecular chloroamination (aminochlorination) reaction (Procedure 1). The corresponding oxazolidinones 2 and 4 are formed in moderate to excellent yields (47-99%). The same reagent combination can be employed to convert azides 6 of γ,δ-unsaturated carboxylic acids into the corresponding lactams 7. The latter