Tetrahydropyridines 4a, 4b, 4c and pyridines 7a, 7b, 7c, 9a, 9b, 9c were synthesized by a [4 + 2] cycloaddition between 1,4-bis aryl-2-aza-1,3-butadienes and electron-poor dienophiles. Dimeric cycloadducts 6a, 6b, 6c, were also isolated indicating a competition between the expected Hetero Diels-Alder and a dimerization process.
四氢
吡啶4a,4b,4c和
吡啶7a,7b,7c,9a,9b,9c是通过在1,4-双芳基-2-氮杂-
1,3-丁二烯与电子贫乏之间进行[4 + 2]环加成反应合成的双亲物。还分离出二聚环加合物6a,6b,6c,表明预期的Hetero Diels-Alder与二聚化过程之间存在竞争。