BF3·OEt2‐Promoted Tandem O‐Arylation/Hydroxylation: Efficient Synthesis of 2‐Hydroxyflavanones from Triazenylaryl‐Substituted Diketones

Abstract A transition‐metal‐free tandem O ‐arylation/hydroxylation approach has been developed for the efficient synthesis of highly substituted 2‐hydroxyflavanones from triazenylaryl‐substituted diketones. The intermediate benzopyrylium cation may be involved in these reactions.