Remote Electronic Effect of Chiral N-Heterocyclic Carbene Catalyst on an Asymmetric Benzoin Reaction.

ABSTRACT

A remote electronic effect of chiral aminoindanol-derived N-heterocyclic carbene catalyst on an asymmetric benzoin reaction was investigated. The catalyst bearing remote electron-withdrawing substituents increased enantioselectivity of the reaction at the cost of the reaction rate. DFT calculations rationalized the increased enantioselectivity.