Improving Phase-Transfer Catalysis by Enhancing Non-Covalent Interactions
A wide variety of asymmetric transformations catalysed by chiral catalysts have been developed for the synthesis of valuable organic compounds in the past several decades. Within asymmetric catalysis field, phase-transfer catalysis has been recognized as a powerful method for establishing useful procedures for organic synthesis. In the present study intermolecular interactions between a well-known alkaloid quinine-derived phase transfer catalyst and four different anions were characterised, analysing the competition between the pure ion-pair interaction and the intermolecular hydrogen bond established upon complexation. Finally, the energy profile corresponding to the enantioselective conjugate cyanation of a a,b-unsaturated ketone, under the presence of two different catalysts were performed.