Diastereoselective total synthesis of 3,6-disubstituted piperidine alkaloids, (3R,6S)-epi-pseudoconhydrine and (3R,6R)-pseudoconhydrine
作者:Sandip R. Khobare、Vikas S. Gajare、Subbarao Jammula、U.K. Syam Kumar、Y.L.N. Murthy
DOI:10.1016/j.tetlet.2013.03.051
日期:2013.6
Diastereoselective total synthesis of 3,6-disubstituted piperidine alkaloids, epi-pseudoconhydrine (1) and pseudoconhydrine (2) has been developed starting from enantiopure (S)-epichlorohydrin. The key steps in the synthesis of these alkaloids involved α-aminobutyrolactone ring opening with N,O-dimethyhydroxyl amine followed by a Grignard reaction and cascade debenzylation-reductive aminative cyclization
从对映体纯(S)-表氯醇开始开发了3,6-二取代哌啶生物碱,epi- pseudoconhydrine(1)和pseudoconhydrine(2)的非对映选择性全合成。合成这些生物碱的关键步骤包括在N,O-二甲基羟胺的作用下使α-氨基丁内酯开环,然后进行格氏反应,并在氢化条件下进行级联脱苄基还原性胺化环化反应。在合成epi- pseudoconhydrine中获得了很高的de (1)。