Selective synthesis of pyridazine-fused chromones and 3-pyridazinyl chromones through intermolecular chromone annulation of <i>o</i>-hydroxyphenylenaminones with aryldiazonium salts

Abstract

A chemodivergent and skeleton-controllable annulation reactions of readily available o -HPEs and aryldiazonium salts was described for the synthesis of highly functionalized pyridazine-fused chromones with high antiviral activity and higher safety.