Diversified Construction of Chromeno[3,4‐c]pyridin‐5‐one and Benzo[c]chromen‐6‐one Derivatives by Domino Reaction of 4‐Alkynyl‐2‐oxo‐2H‐chromene‐3‐carbaldehydes

Silver‐catalyzed three‐component, tandem reactions of 4‐alkynyl‐2‐oxo‐2H‐chromene‐3‐carbaldehydes, amines and various nucleophiles result in the formation of highly functionalized chromeno3,4‐c]pyridin‐5‐ones in high yields. Gold‐catalyzed 4+2] cycloadditions of 4‐alkynyl‐2‐oxo‐2H‐chromene‐3‐carbaldehydes with alkynes or alkenes have also been achieved to afford benzoc]chromen‐6‐ones efficiently.