Organocatalytic asymmetric vinylogous addition to quinones - formation of optically active alpha-aryl ketones |
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Authors: | Alemán José Jacobsen Christian Borch Frisch Kim Overgaard Jacob Jørgensen Karl Anker |
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Affiliation: | Danish National Research Foundation: Center for Catalysis, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark. |
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Abstract: | The first organocatalytic addition of dicyanoalkylidenes to quinones catalyzed by Cinchona alkaloids leading to formation of 1,4-diketone derivatives with high diastereomeric ratios (up to >98 : <2 dr) and enantioselectivities (up to 99% ee) has been developed; the optically active compounds obtained are useful for a number of transformations, e.g. the synthesis of optically active alpha-aryl ketones. |
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