Hybrid Metal/Organo Relay Catalysis Enables Enynes To Be Latent Dienes for Asymmetric Diels—Alder Reaction.

Gold complex BPG in combination with chiral Broensted acid PHA catalyzes the title reaction of enynyl silanols with either naphthoquinone or quinones to give penta- and tetracyclic oxasiline derivatives, correspondingly, as single diastereomers and with excellent enantioselectivities.