Synlett 2005(7): 1047-1072  
DOI: 10.1055/s-2005-865214
ACCOUNT
© Georg Thieme Verlag Stuttgart · New York

Chiral-Auxiliary-Controlled Diastereoselective Epoxidations

Waldemar Adama,b, Aimin Zhang*c
a Institute of Organic Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
b Department of Chemistry, Facundo Bueso 110, University of Puerto Rico, Rio Piedras, Puerto Rico 00931, USA
e-Mail: wadam@chemie.uni-wuerzburg.de; e-Mail: wadam@adam.uprr.pr;
c Department of Chemistry, NSC 815, New York State University at Buffalo, Buffalo, NY, 14260, USA
e-Mail: azhang2@buffalo.edu;
Further Information

Publication History

Received 13 December 2004
Publication Date:
14 April 2005 (online)

Abstract

An overview of the literature through May 2004 on the available chiral auxiliaries for stereoselective epoxidation is reviewed, with emphasis on synthetic utility. The mechanistic complexities of the π-facial selectivity are scrutinized and plausible transition structures for the oxygen-transfer process are proposed. Convenient methods for the removal of the chiral auxiliary and ­applications of the released optically active building blocks in synthesis are featured.

1 Introduction

2 Types of Chiral Auxiliaries

2.1 Amides

2.2 Oxazolidines

2.3 Enecarbamates

2.4 Esters

2.5 Acetals

2.6 Enol Ethers

3 Removal of the Chiral Auxiliary

4 Chiral-Auxiliary-Mediated Epoxidations in Synthesis

5 Outlook