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DOI: 10.1055/s-0033-1340600
Enantioselective Double Aldol Reactions Involving the Sequential Activation of Silicon Tetrachloride by Chiral Phosphine Oxides
Publikationsverlauf
Received: 02. November 2013
Accepted after revision: 03. Dezember 2013
Publikationsdatum:
29. Januar 2014 (online)


Abstract
This account summarizes our recent studies on the development of phosphine oxide-catalyzed enantioselective double aldol reactions that extend hypervalent silicon chemistry by using a Lewis base catalyst. Chiral phosphine oxides repeatedly activate silicon tetrachloride and form hypervalent silicon complexes, thereby promoting sequential activation of substrates and realizing enantioselective double aldol reactions. The account describes several relevant applications of these reactions.
1 Introduction
2 General Concept of Sequential Catalysis by a Lewis Base
2.1 Lewis Base Catalysis with Chlorosilanes
2.2 Phosphine Oxides as Lewis Base Catalysts
3 Branched-Type Double Aldol Reactions
3.1 Enantioselective Branched-Type Double Aldol Reactions Catalyzed by Phosphine Oxides
3.2 Mechanism of the Branched-Type Double Aldol Reactions
3.3 Applications of the Branched-Type Double Aldol Reactions in Enantioselective Syntheses of 2,3-Dihydropyran-4-ones
4 Linear-Type Double Aldol Reactions
4.1 Enantioselective Linear-Type Double Aldol Reactions Catalyzed by Phosphine Oxides
4.2 Mechanism of the Linear-Type Double Aldol Reactions
4.3 Application of the Double Aldol Reactions to the Total Synthesis of (–)-Ericanone
5 Conclusions