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).
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Yuan et al. (2010) studied this question.
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