Mossé S, Alexakis A. First Organocatalyzed Asymmetric Michael Addition of Aldehydes to Vinyl Sulfones.
Org Lett 2005;
7:4361-4. [PMID:
16178533 DOI:
10.1021/ol051488h]
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Abstract
[reaction: see text] The first asymmetric direct Michael addition of aldehydes to vinyl sulfones catalyzed by N-iPr-2,2'-bipyrrolidine is described. 1,4-Adducts are obtained in good yields and enantioselectivities. The determination of absolute configuration allowed us to postulate a Si,Si transition state model, as shown previously for nitroolefins.
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