Heating the 1,3-diynyl bis-α,β-unsaturated hydrazones 3, 6 and 10 results in double intramolecular DielsâAlder reaction of the 1-azadienes, and after aromatisation by loss of dimethylamine, the formation of bipyridines 11â14.
将1,3-二炔基双α,β-不饱和酰
肼3、6和10加热会导致1-偶氮二烯的分子内双Diels-Alder反应,并且在失去
二甲胺后通过芳构化形成联
吡啶11至14。