Synthesis of β- And γ-carbolinones via Pd-catalyzed direct dehydrogenative annulation (DDA) of indole-carboxamides with alkynes using air as the oxidant

Abstract

A palladium-catalyzed direct dehydrogenative annulation (DDA) of indolecarboxamides with internal alkynes via C-H and N-H bond cleavage using air as the oxidant was developed. With this method, both β- and γ-carbolinones can be easily prepared under the mild conditions. © 2010 American Chemical Society.