The stereoselective vinylogous Mannich reaction of dicyanoalkylidenes under phase-transfer catalytic conditions utilizing stable alpha-amido sulfones as imine precursors is presented; a rigid pyrrolidinium salt acts as the phase-transfer catalyst, giving access to the amino alkylated products in generally good yield and up to 95% ee.
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Nieß et al. (2007) studied this question.
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