Visible‐Light Photoredox Catalysis Enables the Biomimetic Synthesis of Nyingchinoids A, B, and D, and Rasumatranin D
作者:Jacob D. Hart、Laura Burchill、Aaron J. Day、Christopher G. Newton、Christopher J. Sumby、David M. Huang、Jonathan H. George
DOI:10.1002/anie.201814089
日期:2019.2.25
The total synthesis of nyingchinoids A and B has been achieved through successive rearrangements of a 1,2‐dioxane intermediate that was assembled using a visible‐light photoredox‐catalysed aerobic [2+2+2] cycloaddition. Nyingchinoid D was synthesised with a competing [2+2] cycloaddition. Based on NMR data and biosynthetic speculation, we proposed a structure revision of the related natural product
nyingchinoids A和B的总合成是通过使用可见光光氧化还原催化的好氧[2 + 2 + 2]环加成反应组装的1,2-二恶烷中间体进行重排而实现的。Nyingchinoid D是通过竞争性[2 + 2]环加成反应合成的。根据NMR数据和生物合成推测,我们提出了相关天然产物rasumatranin D的结构修订,该修订经全合成证实。在光氧化还原条件下,我们观察到通过逆向[2 + 2]环加成,然后进行有氧[2 + 2 + 2]环加成,将环丁烷转化为1,2-二恶烷。