a tin-free radical cascade cyclizationprocess. Not only do amide-iminyl radicals lead to new tetracyclic heterocycles but these nitrogen-centered radical species also react in aromatic homolytic substitutions. Indeed, the amide-iminyl radical moiety unprecedentedly displaces methyl, methoxy, and fluorine radicalsfrom an aromatic carbon atom. This seminal reaction in the field of radical chemistry
Synthesis of Tetracyclic Quinazolinones Using a Visible-Light-Promoted Radical Cascade Approach
作者:Yue-Yue Han、Heng Jiang、Ruzhi Wang、Shouyun Yu
DOI:10.1021/acs.joc.6b00869
日期:2016.8.19
A practical approach for the synthesis of tetracyclic pyrroloquinazolines using photoredox strategy has been developed. The visible-light-promoted intramolecular single-electron-transfer (SET) process between photocatalyst and N-(2-iodobenzyl)-N-acylcyanamides is considered to be involved in this transformation. Targeted pyrroloquinazoline derivatives (15 examples) are presented in good isolated yields