RSS-Feed abonnieren
DOI: 10.1055/s-0029-1217130
Enantioselective Organocatalytic Diels-Alder Reactions
Publikationsverlauf
Publikationsdatum:
20. November 2009 (online)

Abstract
Enantioselective organocatalytic asymmetric Diels-Alder reactions provide a facile and efficient route to optically active functionalized cyclohexenes, which can be further transformed into a variety of important organic compounds. A variety of small organic molecules such as prolines, imidazolidinones, chiral Brønsted acids, guanidines, carbenes and Cinchona alkaloids can be used as different catalyst systems to induce enantioselectivity in the reaction. This review provides an overview of the history of the asymmetric organocatalyzed Diels-Alder reaction.
1 Introduction
2 Chiral-Base-Catalyzed Diels-Alder Reactions
2.1 Chiral Secondary Amines
2.2 Chiral Primary Amines
2.3 Cinchona Alkaloids
2.4 Heterocyclic Carbenes
2.6 Chiral Guanidines
3 Hydrogen-Bond-Catalyzed Diels-Alder Reactions
4 Concluding Remarks
Key words
Diels-Alder reactions - asymmetric catalysis - cycloadditions - organocatalysis
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References
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70For a review, see ref. 21c.
118The nine-membered cyclic structure was observed as one of the energy minima of the complex derived from 120 (without pyridine) and 121 by quantum chemical calculations (PM3, Spartan ’02, Wavefunction, Inc.). The authors supposed pyridine would not participate in the transition state but may stabilize Brassard’s diene in the reaction.
 
    