Synthesis of Oxepanes and trans-Fused Bisoxepanes via Biomimetic, endo-Regioselective Tandem Oxacyclizations of Polyepoxides
摘要:
This communication describes the first examples of tandem endo-regioselective and stereospecific oxacyclizations of 1,5-diepoxides to oxepane products and a similar tandem oxacyclization of 1,5,9-triepoxides to fused bisoxepane cyclic carbonates. A mechanism for these biomimetic oxacyclizations is proposed in which the epoxides act as both electrophilic and nucleophilic reaction partners.
ent-nakorone、ent-durgamone 和 ent-abudinol B 的首次仿生全合成是通过将串联多环氧化物环化与仿生多烯环化的特征相结合而完成的。目前的仿生合成路线为这些海洋天然产物提供了有效的途径。此外,ent-abudinol B 的四取代烯烃的合成证明了钯催化的两种不同多环酮通过相应的乙烯基三氟甲磺酸酯交叉偶联的应用,然后部分氢化所得共轭二烯。
Biomimetic Syntheses from Squalene-Like Precursors: Synthesis of <i>ent-</i>Abudinol B and Reassessment of the Structure of Muzitone
作者:Matthew A. Boone、Rongbiao Tong、Frank E. McDonald、Sheri Lense、Rui Cao、Kenneth I. Hardcastle
DOI:10.1021/ja1006806
日期:2010.4.14
We achieved the stereoselective syntheses of two different structural patterns corresponding to the enantiomers of the marine natural products abudinol B and muzitone, by developing two-directional tandem biomimetic cyclizations of polyepoxides of squalene analogues in which one alkene was functionalized as an enolsilane. In the course of this work, we demonstrated that the structure of muzitone was misassigned.