A useful aminohalogenation reaction for the cyclization of O-alkynyl carbamates under copper catalysis has been developed. N-Halosuccinimides have used as a halogen source. The intramolecular C−N bond formation occurs selectively affording haloalkylidene substituted heterocycles. Just in case α,α-cyclohexyl-substituted propargyl carbamate, alkoxyhalogenation pathway was operative. mechanism two...