Metal-Bridged Polymers as Insoluble Multicomponent Asymmetric Catalysts with High Enantiocontrol: An Approach for the Immobilization of Catalysts without Using any Support

Immobile without support: The first synthesis of chiral Al‐bridged and Ti‐bridged polymers by a metal‐mediated self‐assembly of (R,R)‐6,6′‐bi(binol) (binol=1,1′‐bi‐2‐naphthol), which bears two pairs of phenolic hydroxy groups at the opposite sides in the molecule, is described (see scheme, X=OH or O). The polymers are found to promote asymmetric Michael reaction and carbonyl–ene reaction with high enantioselectivity and can be reused.