Stereocontrolled synthesis of polysubstituted piperidines from vinylogous Mannich adducts and aldehydes
作者:José M. Aurrecoechea、Rubén Suero
DOI:10.1016/j.tetlet.2005.05.097
日期:2005.7
the Mannich-type reaction between 2-silyloxyfurans and acyliminium ions, with an α-unsubstituted aliphatic aldehyde leads to substituted 1,2,3,4-tetrahydropyridines in a process involving an enamine conjugate addition. Reduction of the tetrahydropyridine double bond then affords 3,4,5-tri- or 3,4,5,6-tetra-substituted piperidines stereoselectively.
由2-甲硅烷氧基呋喃和酰基离子的曼尼希型反应衍生的5-(氨基烷基)呋喃-2-酮与α-未取代的脂族醛缩合,可生成取代的1,2,3,4-四氢吡啶涉及烯胺共轭物加成的方法。然后还原四氢吡啶双键,立体地得到3,4,5-三-或3,4,5,6-四取代的哌啶。