Synthesis of Chromeno[4,3‑<i>b</i>]pyrrol-4(1<i>H</i>)‑ones through a Multicomponent Reaction and Cyclization Strategy

A novel three-component reaction of 2-oxo-2H-chromene-3-carbaldehydes with isocyanides and anilines was developed for one-pot assembly of biologically intriguing chromeno­[4,3-b]­pyrrol-4­(1H)-ones, which can also be transferred into diverse polycyclic fused scaffolds through further synthetic manipulations. The described method tolerates a broad substrate scope and proceeds in moderate to good yield via a sequential multicomponent reaction and intramolecular Michael cyclization.