What is the role of 4,7-dimethoxyisobenzofuran (5) in the synthesis of (-)-halenaquinone?

Label:chem

Topic
4,7-dimethoxyisobenzofuran (5) is used in the bridged adduct formation step.
Answer
4,7-Dimethoxyisobenzofuran (5) serves as a reactant in the formation of the bridged adduct (11) with naphthofuranone (9). This step is crucial for constructing the pentacyclic framework of (-)-halenaquinone.
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