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  • Title: Catalytic asymmetric synthesis of 3,3'-diaryloxindoles as triarylmethanes with a chiral all-carbon quaternary center: phase-transfer-catalyzed S(N)Ar reaction.
    Author: Shirakawa S, Koga K, Tokuda T, Yamamoto K, Maruoka K.
    Journal: Angew Chem Int Ed Engl; 2014 Jun 10; 53(24):6220-3. PubMed ID: 24802937.
    Abstract:
    Catalytic asymmetric synthesis of unsymmetrical triarylmethanes with a chiral all-carbon quaternary center was achieved by using a chiral bifunctional quaternary phosphonium bromide catalyst in the S(N)Ar reaction of 3-aryloxindoles under phase-transfer conditions. The presence of a urea moiety in the chiral phase-transfer catalyst was important for obtaining high enantioselectivity in this reaction.
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