TMSOTf-catalyzed intramolecular seleno-arylation of tethered alkenes was performed using polystyrene-supported succinimidyl seleaide as the selenium source.This catalytic process provides an efficient method for the regioselective synthesis of dihydrocoumarins possessing a seleno-functionality,followed by traceless cleavage of selenium linker to provide dihydrocoumarins and coumarins in good yields and purities.