The silica gel- or solvent-promoted intramolecular protonative cyclization of ynamides containing o-methylthioaryl groups resulted in the one-pot formation of biologically important benzo[b]thiophenes. Compared with ynamide activation methods that use strong Brønsted acids or expensive transition metals, this protocol is mild and economical. Due to these merits, various functionalized 2-amido benzo[b]thiophenes were furnished in a convenient way.
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.