Unlike the organocatalysts reported thus far, the stereoselectivity of the products was controlled by using tilted 2,6-difl uorophenylamide group of the catalyst 1a.As a result, the aldol reaction of aromatic aldehydes with cycloalkanones mainly proceeded by the attack of Si -face of the enamine on the Si -face of aromatic aldehyde due to the steric hindrance ( Fig. 1).