Synlett 2007(11): 1644-1655  
DOI: 10.1055/s-2007-980384
ACCOUNT
© Georg Thieme Verlag Stuttgart · New York

Lewis and Brønsted Acid Catalyzed Allylboration of Carbonyl Compounds: From Discovery to Mechanism and Applications

Dennis G. Hall*
Department of Chemistry, University of Alberta, W5-07 Gunning-Lemieux Chemistry Centre, Edmonton, Alberta, T6G 2G2, Canada
Fax: +1(780)4928231; e-Mail: dennis.hall@ualberta.ca;
Further Information

Publication History

Received 22 January 2007
Publication Date:
25 June 2007 (online)

Abstract

The recent development of Lewis and Brønsted acid ­catalyzed manifolds for the allylboration of carbonyl compounds has opened doors towards an ideal carbonyl allylation methodology using stable and nontoxic allylic boronates as reagents. This ­Account relates our laboratory’s discovery of acid-catalyzed allyl­borations, mechanistic investigations of these new processes, and ongoing efforts by our group and others towards a general catalytic enantioselective allylboration methodology.

1 Introduction

2 Discovery and Development of Catalyzed Allylborations with 2-Alkoxycarbonyl Allylic Boronates

2.1 Lewis Acid Catalyzed Allylboration

2.2 Brønsted Acid Catalyzed Allylboration

3 Mechanistic Considerations

4 Stoichiometric Approaches to Enantiocontrolled ­Allylboration of Aldehydes

5 Catalytic Methods for Enantioselective Allylborations

6 Lewis Acid Catalyzed Additions of α-Substituted Allylic Boronates

7 Conclusion