Supported ionic liquids (SILs) have been engaged in asymmetric synthesis,
providing better recoverability, enantioselectivity, catalytic action, and economical and
environmentally benign paths. SILs have minimized the limitations of previous
homogeneous and heterogeneous systems and also opened new routes to design chiral
heterogeneous systems with improved catalytic efficiency, including stability and
recyclability. To carry out asymmetric reactions, both chiral catalysts and ILs have
been supported onto a single support material, generally through a physical
immobilization approach. In some cases, chiral ionic liquids have been grafted onto
supports to obtain chiral SIL. The chirality has also been transferred into the resulting
heterogeneous catalyst by covalently grafting chiral catalysts onto catalytic centers of
supports by using ionic liquids as linkers. In this chapter, the potential catalytic role of
all types of chiral SILs in several asymmetric organic reactions, such as hydrogenation,
Mannich, epoxidation, Michael addition, Strecker, Diels-Alder reaction, etc., has been
discussed.
Keywords: Asymmetric synthesis, Asymmetric reactions, Anantiomeric excess, Chiral catalysts, Chemical transformations, Chirality, Diastereoselective, Ecofriendly, Enantioselectivity, Grafting, Heterogeneous systems, Immobilization, IL-chiral catalysts, Reusability, Supported ionic liquids.
