Chiral Tetraaza Ligands in Asymmetric Catalysis: Recent Progress

Abstract

Nitrogen-containing ligands have become very popular in asymmetric catalysis, due to their robustness and availability in comparison to phosphines. Nitrogen-containing ligands are used in homogeneous catalysis, but they are suitable for heterogeneous processes, too. In this article we focus on chiral ligands with four nitrogen atoms and summarize recent progress achieved with these compounds in asymmetric catalysis.