Reaction of a variety of (α,β-unsaturated) imines or oximes with aliphatic aldehydes or cyclic ketones in the presence of a secondary amine afforded alkyl-, and/or aryl-, and/or cycloalkyl-substituted pyridines.1 To explain their formation, a hetero Diels-Alder reaction has been postulated, in which an 1-aza-1,3-butadiene reacts with an in situ generated enamine.
在存在二级胺的条件下,各种(α,β-不饱和)
亚胺或
肟与脂肪族醛或环酮反应,得到烷基-、芳基-和/或环烷基取代的
吡啶。为了解释它们的形成,提出了杂Diels-Alder反应,其中1-氮-
1,3-丁二烯与现场生成的烯胺反应。