The Synthesis of C2-Symmetric and Axially Chiral Compounds for Recognition and Catalysis

Axially chiral amidines and guanidines, some possessing C2-symmetry, have been targeted as potential chiral catalysts for reactions of α,β-unsaturated carboxylic acids or esters. The key step in each synthesis required the coupling of two sterically demanding aromatic compounds to form atropisomeric biaryl species.