An efficient, direct synthesis of oxazolidinones fused to six‐membered heterocyclicrings starting from carbamate‐protected aminoalkenes has been developed. This procedure is based on an oxidative palladium(II)‐catalyzed reaction performed in the presence of stoichiometric copper chloride, which is determinant to promote the formation of the bicyclic product and prevent the isolation of the monocyclic