Herein, a novel electrochemical arene radical cation promoted dearomative spirocyclization of biaryl ynones with alcohols is described, providing a conceptually novel transformation mode for producing diverse alkoxylated spiro[5,5]trienones. The catalyst- and chemical-oxidant-free spirocyclization protocol features broad substrate scope and high functional group tolerance. Mechanistic studies reveal that the generation of arene radical cation via anodic single-electron oxidation is crucial, with sequential 6-- cyclization, dissociation of hemiketal, anodic oxidation, and nucleophilic attack of alcohols.
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| http://dx.doi.org/10.1021/acs.orglett.3c03678 | DOI Listing |
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