Chiral 8-substituted 10,10-dimethyl-5-pyridin-2-yl-6-aza-tricyclo[7.1.1.02,7]undeca-2(7),3,5-trien-8-ols as enantioselective catalysts in the addition of diethylzinc to substituted benzaldehydes

The derivatives of ligand 6 were prepared and assessed in the enantioselective addition of diethylzinc to substituted benzaldehydes providing the alcohols of (S)-configuration with enantiomeric excess generally ranging from 45 to 79%.