An sp(2)/sp(3) get-together: A novel and efficient method can be used to synthesize 3,3-disubstitued oxindoles by the direct intramolecular oxidative coupling of an aryl C(sp(2))-H and a C(sp(3))-H center (see scheme; DMF = N,N-dimethylformamide).
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Jia et al. (2009) studied this question.
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