Novel cage compounds from inter-intra-molecular Diels–Alder reactions of 1,2,4-triazines with cyclo-octa-1,5-diene

Abstract
1,2,4-Triazines with electron-withdrawing substituents at the three position react with cyclo-octa-1,5-diene by intermolecular Diels–Alder addition followed by elimination of nitrogen; the 2-azadiene so formed then undergoes an intramolecular Diels–Alder reaction producing novel cage compounds.

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