Biocatalytic Desymmetrization of an Atropisomer with both an Enantioselective Oxidase and Ketoreductases

All roads lead to …︁ atropisomeric diaryl ethers containing a benzylic hydroxy group and an aldehyde unit. The isomers were synthesized in enantiomerically enriched form by desymmetrizing atroposelective enzymatic oxidation (with a galactose oxidase (GOase) variant) or reduction (with a ketoreductase (KRED); see scheme).