A new palladium-catalyzed synthesis of 3,4-disubstituted coumarins from 3-alkenoates of ortho-iodophenol, phenylacetylene and carbon monoxide

Abstract Palladium(0) has been found to catalyse the reaction of an aromatic carbon-iodide bond with carbon monoxide, the triple bond of alkynes and the allylic carbon of an ortho alkenoic chain to form a 3,4-disubstituted coumarin ring in satisfactory yield under mild conditions.