A novel class of N-Fmoc-protected amino alkyl thiocy-
anates/selenocyanates has been prepared by thiocyanation/seleno-cyanation of the corresponding alkyl iodides. These thiocyanates/selenocyanates undergo a facile [2+3]-cycloaddition reaction with sodium azide to afford novel N-Fmoc amino alkylS/Se-linked tetra-zoles