Synthesis and Application of Polymer-Supported Chiral Bronsted Acid Organocatalysts

A new methodology for the immobilization of chiral Bronsted acids has been developed. The resulting heterogeneous organocatalysts have been employed in multiple consecutive catalysis cycles in the asymmetric organocatalytic transfer hydrogenation. The new catalyst system can not only be easily recovered from the reaction mixture in a tea-bag approach but it can also be easily reused in several catalytic cycles without loss of reactivity and selectivity.