BBr3-Mediated Dearomatizative Spirocyclization of Biaryl Ynones: Facile Access to Spiro[5.5]dienones

BBr3 mediated dearomative spirocyclization of biaryl ynones has been reported. The direct synthesis of spiro[5.5]dienones with tri-substituted double bond is described for the first time in this paper. The scope...