A rhodium-catalyzed enantioselective addition of glyoxylates to arylboronic acids
promoted by a simple chiral sulfinamide-based olefin ligand under mild reaction conditions
is described. The reaction provides access to a variety of optically active substituted
mandelic acid esters in good yields with up to 83% ee. The catalytic system is also
applicable to pyruvate addition. The synthetic utility of this method is highlighted
by a formal synthesis of the antiplatelet drug clopidogrel.
Key words
asymmetric catalysis - rhodium catalysis - ligands - mandelic acid esters - glyoxylate
- arylboronic acids