Abstract
Nitroxides connected to indoles, tetrazoles, or 1,3,4-oxadiazoles were synthesized by conventional and microwave-assisted cyclization reactions. New approaches to pyrrole-, pyrazole-, and triazole-annulated nitroxides are described. We showed that Diels–Alder reactions of the <i>N</i>-<i>tert</i>-butoxycarbonyl derivative of (4,4,6,6-tetramethyl-2,4,6,7-tetrahydro-5<i>H</i>-pyrrolo[3,4-<i>c</i>]pyridin-5-yl)oxidanyl gave polycyclic scaffolds condensed with a six-membered nitroxide.
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