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Highly functionalized cyclopropanes can be produced with excellent enantioselectivity through an amine-catalyzed organocatalytic cyclopropanation process (see scheme). Catalytically generated asymmetric ammonium ylides mediate the reaction, and the cyclopropane products can be produced as either enantiomer by using quinine- or quinidine-derived catalysts.
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Papageorgiou et al. (2004) studied this question.
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