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This report covers boron tribromide (BBr3) 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.

Graphical abstract: BBr3-mediated dearomative spirocyclization of biaryl ynones: facile access to spiro[5.5]dienones

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