Intramolecular cyclization of ortho-iodophenyl 3-butenoate to 4-methylcoumarin: Catalysis by palladium complexes

Abstract A new palladium-catalyzed synthesis of 4-alkylcoumarins is reported, based on intramolecular arylation of the 3-alkenoic chain of an ortho -iodophenyl ester.