Synthesis of benzofuro- and benzothieno[2,3-<i>c</i>]pyridines <i>via</i> copper-catalyzed [4 + 2] annulation of ketoxime acetates with acetoacetanilide

Abstract

An efficient copper-catalyzed annulation of ketoxime acetates with acetoacetanilide has been developed for the facile synthesis of benzofuro- and benzothieno[2,3-<italic>c</italic>]pyridines.