Synlett 2014; 25(5): 631-640
DOI: 10.1055/s-0033-1340600
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© Georg Thieme Verlag Stuttgart · New York

Enantioselective Double Aldol Reactions Involving the Sequential Activation of Silicon Tetrachloride by Chiral Phosphine Oxides

Shunsuke Kotani
a   Priority Organization for Innovation and Excellence, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
,
Masaharu Sugiura
b   Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan   Fax: +81(96)3727692   Email: nakajima@gpo.kumamoto-u.ac.jp
,
Makoto Nakajima*
b   Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan   Fax: +81(96)3727692   Email: nakajima@gpo.kumamoto-u.ac.jp
› Author Affiliations
Further Information

Publication History

Received: 02 November 2013

Accepted after revision: 03 December 2013

Publication Date:
29 January 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