Synlett 2020; 31(06): 535-546
DOI: 10.1055/s-0039-1690777
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© Georg Thieme Verlag Stuttgart · New York

3,3′-Bithiophene-Based Chiral Bisphosphine Oxides as Organocatalysts in Silicon-Derived Lewis Acid Mediated Reactions

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This work was conducted with financial support from Università degli Studi di Milano, Italy (Piano Sostegno alla Ricerca - PSR2018 grant to SG).
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Publication History

Received: 21 October 2019

Accepted after revision: 03 December 2019

Publication Date:
07 January 2020 (online)


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Published as part of the ISySyCat2019 Special Issue

Abstract

This account summarizes the development of new biheteroaromatic chiral bisphosphine oxides. 3,3′-Bithiophene-based phosphine oxides (BITIOPOs) have been successfully used as organocatalysts to promote Lewis base catalyzed, Lewis acid mediated stereoselective transformations. These highly electron-rich compounds, in combination with trichorosilyl derivatives (allyltrichlorosilane and silicon tetrachloride), generate hypervalent silicon species that act as chiral Lewis acids in highly diastereo- and enantioselective organic reactions. Several relevant examples related to these applications are discussed in detail.

1 Introduction

2 The BITIOPO Family

3 Enantioselective Opening of Epoxides

4 Enantioselective Allylation of Aldehydes

5 Stereoselective Direct (Double) Aldol-Type Reaction with Ketones

6 Stereoselective Direct Aldol-Type Reaction with Ester Derivatives

7 Conclusions