作者:Di Liu、Xiaoming Yu、Liang Huang
DOI:10.1002/cjoc.201201187
日期:2013.3
rearrangement, giving the γ,δ‐unsaturated acid, which underwent a substrate‐induced stereoselective bromolactonization to afford the expected all‐equatorial substituted bromo‐δ‐lactone. An unusual chemo‐selective aminolysis of the lactone resulted in the formation of a γ,δ‐epoxy‐amide in stereospecific manner. Base‐promoted cyclization of this intermediate and the subsequent Davis oxidation furnished the synthesis
描述了(-)-clausenamide的六步合成。将光学纯的(R,E)-1,3-二苯基烯丙醇乙酰化,然后进行Ireland-Claisen重排,得到γ,δ-不饱和酸,然后对其进行底物诱导的立体选择性溴内酯化,以提供预期的全赤道取代的溴δ-内酯。内酯的异常化学选择性氨解导致立体定向方式形成γ,δ-环氧酰胺。该中间体的碱促进环化反应和随后的Davis氧化反应完成了合成,最终产物的ee > 99%和高达34%的总产量。