Abstract
A perspective on the literature dealing with the organocatalytic asymmetric preparation
of axially chiral N-heterocycles is provided. A particular focus is devoted to rationalize
the synthetic strategies employed in each case. Moreover, specific classes of organocatalysts
are shown to stand out as privileged motives for the stereoselective preparation of
such synthetically challenging molecular architectures. Finally, an overview of the
main trends in the field is given.
1 Introduction
2 Five-Membered Rings
2.1 Arylation
2.2 Dynamic Kinetic Resolution
2.3 Ring Construction
2.4 Central-to-Axial Chirality Conversion and Chirality Transfer
2.5 Desymmetrization
3 Six-Membered Rings
3.1 Desymmetrization
3.2 (Dynamic) Kinetic Resolution
3.3 Ring Construction
3.4 Central-to-Axial Chirality Conversion
4 Conclusion
Key words
heterocycles - atropisomerism - organocatalysis - indole - pyrrole - pyridine - quinoline