Hetero Michael addition on chiral β′-amino-α,β-unsaturated ketone furnished, after some structural modifications, β,β′-diaminoketals. Mannich type reaction of these diamines with an aldehyde led, with a high diastereoselectivity, to trisubstituted piperidines. Starting from a functionalized aldehyde and after subsequent deprotection of the amino group, an intramolecular Michael addition provided o
经过一些结构修饰后,在手性β'-氨基-α,β-不饱和酮上的杂迈克尔加成反应提供了β,β'-二氨基缩酮。这些二胺与醛的曼尼希型反应以高非对映选择性导致三取代的哌啶。从官能化的醛开始并在随后的氨基脱保护之后,分子内迈克尔加成提供了八氢-2 H-吡咯并-[3,4- b ]-吡啶,这是一种在展示生物活性的化合物中发现的罕见骨架。