New synthetic approaches to naturally occurring and unnatural pyranoflavones

Abstract

Total synthesis of biologically interesting natural and unnatural pyranoflavones has been accomplished starting from readily available 2,4-dihydroxyacetophenone or 2,4-dihydroxy-6-methoxyacetophenone in three steps, i.e., benzopyran formation, condensation, and cyclization reaction. Copyright © 2013 Verlag Helvetica Chimica Acta AG, Zürich.