A new active Lewis acid–Lewis base bifunctionalasymmetric catalyst 7 was developed using carbohydrate as a scaffold and this catalyst was applied to the asymmetriccyanosilylation of aldehydes and acetophenone. The β-Ph group at the 6-position of 7 was found to be important for a high asymmetric induction (up to 80% ee) by bringing the Al and the phosphine oxide at optimum positions for a dual activation