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Caught in the act: A new concept for asymmetric Brønsted acid catalysis is presented. Compounds containing an acidic functionality in addition to an anion recognition site act as powerful conjugate-base-stabilized Brønsted acid catalysts. This strategy was applied to the first catalytic enantioselective three-component Povarov reaction of indoline and other secondary aromatic amines (see scheme; M.S.=molecular sieves).
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Min et al. (2013) studied this question.
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