Cycloaddition of Spiroepoxycyclohexa-2,4-dienones, Radical Cyclization and 1,3-Acyl Shift in Excited State: Aromatics to Sterpuren-4-one
作者:Raghaba Sahu、Vishwakarma Singh
DOI:10.1021/acs.joc.7b00867
日期:2017.6.16
A stereoselective route to sterpuren-4-one from a simple aromatic precursor is presented. Oxidative dearomatization, π4s + π2s cycloaddition of 6,6-spiroepoxycyclohexa-2,4-dienones with ethyl acrylate, radical cyclization and 1,3-acyl shift in excited state are the important aspects of our approach. An interesting effect of a remote substituent on radical cyclization has also been presented.
提出了从简单的芳香族前体到立体异构4-立体立体选择的路线。氧化脱芳构化,π 4 S +π 2 S的6,6- spiroepoxycyclohexa -2,4-二烯酮环加成与丙烯酸乙酯,激进的环化和1,3-酰基移在激发态是我们的方法的重要方面。还提出了远程取代基对自由基环化的有趣作用。