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Synthesis 2009(4): 687-690
DOI: 10.1055/s-0028-1083284
DOI: 10.1055/s-0028-1083284
PSP
© Georg Thieme Verlag
Stuttgart ˙ New York
Synthesis of Enantioenriched α,α-Disubstituted Cyclopentenes Catalyzed by N-Heterocyclic Carbenes
Weitere Informationen
Received
5 August 2008
Publikationsdatum:
19. Dezember 2008 (online)
Publikationsverlauf
Publikationsdatum:
19. Dezember 2008 (online)

Abstract
The desymmetrization of 1,3-diketones using N-heterocyclic carbenes results in the formation of highly enantioenriched cyclopentenes in good yield. The reaction proceeds through a catalytic intramolecular aldol reaction and subsequent β-lactone formation. The expulsion of carbon dioxide at mild reaction temperatures affords the cyclopentene products.
Key words
carbenes - asymmetric catalysis - Umpolung - β-lactones - aldol reactions
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