Abstract: Regioselectivity in photochemical reaction system is a topic of current interest^[1].The regioselective photochemical amination reactions are useful tool to the synthesis of isoquinolines^[2] and aporphines^[3].The photoinduced electron transfer sensitized by electron deficient 1,4-dicyanobenzene(DCB) can produce cation radicals which has been identified by transient absorption study^[4].In continuation to our interests in the selective reactions of the photoinduced cation radicals,a series of 2-styrythiophenes 1～5 are synthesized to study the photoamination reaction.

Key words: photosensitization, electron transfer, nucleophilic addition, regioselectivity