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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