Synchronizing organocatalysis! By targeting structural and stereochemical complexity with organocascade reactions, distinct catalysts can form molecular frameworks in an enantiodivergent way. This goal was elegantly achieved for the asymmetric synthesis of quaternary carbon centers by two complementary routes employing cascades of either enamine or iminium catalysis (see scheme; En=enamine activation, Im=iminium activation).
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Westermann et al. (2009) studied this question.
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