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Abstract
Breviones, allelopathic agents that have been isolated from Penicillium sp., are structurally unique diterpenoid derivatives. Breviones have attracted attention due to their bioactivity, because their allelopathic activities may offer agricultural use as environmentally benign herbicides. On the other hand, their structural uniqueness is also remarkable, and construction of their unique structure is a challenge from the viewpoint of organic synthesis. This review summarizes synthetic studies on breviones and structurally related natural products.
