Catalytic Asymmetric Intramolecular Cascade Reaction for the Construction of Functionalized Benzobicyclo[4.3.0] Skeletons. Remote Control of Enantioselectivity
A catalytic asymmetric version of the intramolecular ylide annulation has been developed which affords high ee values and diastereoselectivities and which further shows that spirobiindane-based chiral phosphines can be excellent organocatalysts. Both optically active benzobicyclo[4.3.0] compounds 2 and 2′ with three continuous stereogenic centers could be obtained as major products selectively under