A multiselective Diels–Alder (DA) reaction of α-arylacroleins with cyclopentadiene using BBr3-assisted chiral BINOL-derived phosphoric acid catalysts has been developed. This unusual exo- and enantioselective DA reaction can be multicontrolled by the chiral cavity of the in situ-formed acid–base cooperative catalysts, in particular, suppressing the competitive hetero Diels–Alder (HDA) reaction effectively.journal articl
