Dynamic Kinetic Resolution and Desymmetrization Processes: A Straightforward Methodology for the Enantioselective Synthesis of Piperidines
作者:Mercedes Amat、Oriol Bassas、Núria Llor、Margalida Cantó、Maria Pérez、Elies Molins、Joan Bosch
DOI:10.1002/chem.200600420
日期:2006.10.16
A straightforward procedure for the synthesis of enantiopure polysubstituted piperidines is reported. It involves the direct generation of chiral non-racemic oxazolo[3,2-a]piperidone lactams that already incorporate carbon substituents on the heterocyclic ring and the subsequent removal of the chiral auxiliary. The key step is a cyclocondensation reaction of (R)-phenylglycinol or other amino alcohols
报道了合成对映纯多取代哌啶的简单方法。它涉及直接产生已经在杂环上掺入碳取代基的手性非外消旋恶唑并[3,2-a]哌啶酮内酰胺,随后除去手性助剂。关键步骤是(R)-苯基甘醇或其他氨基醇与外消旋或手性δ-氧代(二)酸衍生物在高度立体选择性的过程中进行的环缩合反应,该过程涉及动态动力学拆分和/或非对映体或对映体酯基的去对称化。