Access to Cyclic Tetrazanes by Intramolecular Oxidative Coupling of Tethered‐Bishydrazines

Abstract We report the formation of tetrazolidinones and thiatetrazolidines, i.e., heterocycles with four σ‐bonded nitrogen atoms in their structure, via the oxidative coupling of two hydrazines tethered by a carbonyl or a sulfonyl moiety. Different strategies for installing the tethers on the various bishydrazine precursors are first presented, and their cyclization is presented next. The influence of the protecting groups on the α and/or β nitrogen atoms, as well as the nature of the oxidant leading to the tetrazane core, is studied.