Catalytic asymmetric α-arylation of N-unprotected 3-substituted oxindoles with diaryliodonium salts has been realized by a chiral Lewis acid promoted electrophilic addition and aryl-rearrangement process. Single C3-arylated products containing a quaternary carbon center were generated in high enantioselectivity and reactivity.
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Guo et al. (2013) studied this question.
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