Enantioselective Michael addition of malononitrile to chalcones catalyzed by a simple quinine-Al(O(i)Pr)(3) complex: a simple method for the synthesis of a chiral 4H-pyran derivative.

Enantioselective Michael addition of malononitrile to chalcones catalyzed by a simple quinine-Al(O(i)Pr)(3) complex: a simple method for the synthesis of a chiral 4H-pyran derivative.