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reaction: see text Fused 5-heterotetrazole ring systems are synthesized in high yield via intramolecular 2 + 3 cycloadditions of organic azides and heteroatom-substituted nitriles. Cyanates, thiocyanates, and cyanamides are all competent dipolarophiles for this reaction. A variety of scaffolds are tolerated when the new enclosed ring is five- or six-membered.
Demko et al. (Sat,) studied this question.