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Bergman cyclization of enediyne compounds was first studied by Bergman et al.at 1973.1 The enediyne compounds can be transformed into highly reactive diradical intermediates under various conditions.This process leads to double strand DNA cleavage and self-programmed cell death,possessing high antibiotic activities.2 Bergman cyclization also plays an important role in developing of polymeric materials with valuable thermal and photo properties and the synthesis of polycyclic compounds.