Abstract
An efficient enantioselective method for the construction of all-carbon quaternary stereocenters from 3-aryl-substituted oxindoles via asymmetric phase-transfer alkylation has been developed. The products are obtained in high yields and optical purity of up to 93 % ee by using (S,S)-3,4,5-trifluorophenyl-NAS bromide as a chiral phase-transfer catalyst. The 3,3-disubstituted oxindole products are valuable intermediates for the synthesis of bioactive indole-containing natural products.
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