Chiral Imidazolium Ionic Liquids Derived from (<i>S</i>
)-Prolinamine as Organocatalysts in the Asymmetric Michael Reaction and Michael-Aldol Cascade Reaction under Solvent-Free Conditions
The synthesis of three new chiral imidazolium ionic liquids (prepared by the combination of one new chiral organic cation with different anions) and their application in the enantioselective Michaelreaction between cyclohexanone and substituted nitrostyrenes under solvent-free conditions is described. In addition, the first asymmetriccascade Michael-aldol reaction of cyclohexanone and benzylidenepyruvate