A novel class of N-Fmoc-protected amino alkylthiocyanates/selenocyanates has been prepared by thiocyanation/selenocyanation of the corresponding alkyl iodides. These thiocyanates/selenocyanates undergo a facile [2+3]-cycloaddition reaction with sodium azide to afford novel N-Fmoc amino alkyl S/Se-linked tetrazoles. amino acid derivatives - thiocyanates - selenocyanates - [2+3] cycloaddition - S/Se-linked