A novel double ‘inverse electron-demand’ Diels-Alder reaction of azolyldienamines and tetrazines, András Kotschy, Zoltán Novák, Zoltán Vincze, David M. Smith, György Hajós, Tetrahedron Lett. 1999, 40, 6313-6316. DOI: 10.1016/S0040-4039(99)01184-3 |

Appropriately substituted azolyldienamines were found to undergo double ‘inverse electron-demand’ Diels-Alder reactions with tetrazine derivatives, yielding azolypyridazines and dihydropyridazines as products.