Divergent Total Synthesis of the Tricyclic Marine Alkaloids Lepadiformine, Fasicularin, and Isomers of Polycitorols by Reagent-Controlled Diastereoselective Reductive Amination
作者:Jinkyung In、Seokwoo Lee、Yongseok Kwon、Sanghee Kim
DOI:10.1002/chem.201404316
日期:2014.12.22
We describe a flexible and divergent route to the pyrrolo‐/pyrido[1,2‐j]quinoline frameworks of tricyclic marine alkaloids via a common intermediate formed by the ester–enolate Claisen rearrangement of a cyclic amino acid allylic ester. We have synthesized the proposed structure of polycitorols and demonstrated that the structure of these alkaloids requires revision. In addition to asymmetric formal
我们描述了通过环氨基酸烯丙基酯的酯-烯酸酯克莱森重排形成的常见中间体,向三环海洋生物碱的吡咯并//吡啶并[1,2- j ]喹啉骨架形成灵活多样的途径。我们已经合成了所提出的聚瓜酚的结构,并证明这些生物碱的结构需要修改。除了不对称的形式合成外,(-)-lepadiformine和(-)-fasicularin的立体选择性和简洁的总合成也可以通过简单的,可商购的起始原料以完全受底物控制的方式完成。这些总合成过程中的关键步骤是常见中间体的依赖试剂的立体选择性还原胺化反应,以产生吲哚并立定55 a或55b的。受阻C-10基团与同烯丙基基团的Aziridinium介导的碳同源性促进了合成。