This report covers boron tribromide (BBr) mediated dearomative spirocyclization of biaryl ynones. The direct synthesis of spiro[5.5]dienones with a tri-substituted double bond is described for the first time in this paper. The scope of the reaction is broad and the spirocyclic products were obtained in moderate to good yields.
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Ferric Chloride Mediated Dearomative Spirocyclization of Biaryl Ynones: Synthesis of 3,3-Spiroindanones.
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