Heating the 1,3-diynyl bis-α,β-unsaturated hydrazones 3, 6 and 10 results in double intramolecular Diels–Alder reaction of the 1-azadienes, and after aromatisation by loss of dimethylamine, the formation of bipyridines 11–14.
N. Bushby, C. J. Moody, D. A. Riddick and I. R. Waldron, Chem. Commun., 1999, 793 DOI: 10.1039/A901641D
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