Regiodivergent Remote Arylation of Cycloalkanols to Dysideanone′s Fused Carbotetracycles and Its Bridged Isomers
作者:Md Ashraful Haque、Chandan K. Jana
DOI:10.1002/chem.201703094
日期:2017.9.27
arylations across an all‐carbon quaternary center of cycloalkanols to access enantioenriched fused and bridged carbotetracycles are reported. The conformation of the carbocation guided either sequential stereospecific β‐C‐Me/γ‐C−H‐shifts or β‐C‐Me/γ′‐C−H‐shifts, providing fused carbotetracyclic analogs of dysideanone or bridged tetracycles, respectively. The reaction is highly stereoselective in building three
据报道,环烷醇的全碳四元中心的区域发散性γ和γ'芳基化可进入对映体富集的稠合和桥连的碳四环。碳正离子的构象指导顺序立体定向β-C-Me/γ-C-H-移位或β-C-Me/γ'-C-H-移位,分别提供dysideanone的稠合碳四环类似物或桥联的四环。在建立三个连续的立体中心时,该反应具有高度的立体选择性,其中一个,两个或三个可能是全碳四元中心。有趣的是,机理研究揭示了甲基取代基在控制区域选择性中的关键作用。