Biogenesis‐Guided Synthesis and Structural Revision of Sarocladione Enabled by Ruthenium‐Catalyzed Endoperoxide Fragmentation
作者:Yuhan Ning、Hailong Tian、Jinghan Gui
DOI:10.1002/anie.202101451
日期:2021.5.10
Sarocladione is the first 5,10:8,9‐diseco‐steroid with a 14‐membered macrocyclic diketone framework to have been isolated from a natural source. Herein we report a biomimetic synthesis of sarocladione in only two or seven steps from inexpensive, commercially available ergosterol. The key feature of this synthesis was a novel ruthenium‐catalyzed endoperoxide fragmentation, which transformed various
The homogeneous and heterogeneous electrontransfer (ET) reduction of ascaridole (ASC) and dihydroascaridole (DASC), two bicyclicendoperoxides, chosen as convenient models of the bridged bicyclicendoperoxides found in biologicallyrelevant systems, were studied in aprotic media by using electrochemical methods. ET is shown to follow a concerted dissociative mechanism that leads to the distonic radical