Using Au catalyst and ethyl Hantzsch ester as a hydrogen source, 3-(1-alkynyl)chromones were directly transformed to 4H-benzofuro[3,2-c]pyrans in good to excellent yields through a cascade process by addition, cyclization and hydrogen transfer under mild conditions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.