A　one-pot,　two-step　cyclization　reaction　of　iodoarenes　with　diversified　arylols,　including　4-hydroxyquinoline,　quinolinone,　4-hydroxypyridine　and　phenol,　has　been　developed.　By　using　this　palladium-catalyzed　formal　tandem　O-arylation,　dehydrogenative　cross-coupling　reaction,　a　variety　of　biologically　significant　fused　benzo[4,5]　furo　heterocycles　and　dibenzofurans　were　quickly　assembled　in　high　yields　with　excellent　regioselectivity.　Notably,　the　efficient　one-pot　reaction　led　to　the　heterocycles　via　sequential　oxidation,　iodination,　isomerization　and　cyclization　steps　without　purification　of　any　reaction　intermediates.