Abstract
Enzymes harness an array of noncovalent interactions to accomplish stereospecific
transformations. Similarly, chemists have engineered chiral catalysts capable of eliciting
noncovalent interactions for asymmetric synthesis. In this context, incorporating
ionic groups into synthetic transition-metal catalysts represents a promising design
element for enantioselective reactions by engaging electrostatic interactions between
ligands and substrates. However, the nondirectional nature of ionic interactions presents
a unique challenge in precise transmission of chirality. This account summarizes our
recent work on developing phosphine ligands possessing nonligating ionic groups for
exerting long-range stereocontrol in Suzuki–Miyaura reactions.
1 Introduction
2 Remote Quaternary Stereocenters
3 Mechanically Planar Chiral Rotaxanes
4 Atropo-enantioenriched Biaryls
5 Conclusions
Key words
stereoselectivity - cross-coupling - noncovalent interactions - quaternary stereocenters
- rotaxanes - atropisomerism - mechanically planar chirality - ionic interactions