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It's so simple! Organocatalysts formed through the self-assembly of simple α-amino acids and alkaloid thiourea derivatives (see scheme) are used as highly efficient catalysts for the direct nitro-Michael addition of ketones and nitroalkenes, affording excellent ee values up to 99 %. Enantioselectivity may be tuned by changing components of the self-assembled catalyst.
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Mandal et al. (2008) studied this question.
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