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The reduced flavin is restored to its oxidized state via oxidation by molecular oxygen, which results in the production of hydrogen peroxide. An efficient synthetic process for the construction of the tetracyclic sulfur-containing discorhabdin-type alkaloid framework is presented. Achieving success hinges on the BF3Et2O-promoted dienone-phenol rearrangement/sulfur insertion cascade, which accomplishes the conversion of the common N,O-acetal-bridged tetracyclic framework to t