Synthesis 2013; 45(17): 2343-2371
DOI: 10.1055/s-0033-1338501
review
© Georg Thieme Verlag Stuttgart · New York

Metalated Indoles, Indazoles, Benzimidazoles, and Azaindoles and Their Synthetic Applications

Hiriyakkanavar Ila
a   New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 50064, India
,
John T. Markiewicz
b   Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5–13, Haus F, 81377 München, Germany   Fax: +49(89)218077680   Email: paul.knochel@cup.uni-muenchen.de
,
Vladimir Malakhov
b   Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5–13, Haus F, 81377 München, Germany   Fax: +49(89)218077680   Email: paul.knochel@cup.uni-muenchen.de
,
Paul Knochel*
b   Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5–13, Haus F, 81377 München, Germany   Fax: +49(89)218077680   Email: paul.knochel@cup.uni-muenchen.de
› Author Affiliations
Further Information

Publication History

Received: 30 April 2013

Accepted: 02 May 2013

Publication Date:
15 August 2013 (online)


Dedicated to Victor Snieckus on the occasion of his 76th birthday

Abstract

This review focuses on the regioselective metalation of condensed azoles, such as indole, indazole, benzimidazole, 4-, 5-, 6-, and 7-azaindole. The metalation strategies discussed include halogen–metal exchange, metal insertion into carbon–halogen bonds, and directed deprotonation. The influence of different nitrogen-protecting­ groups and directed metalating groups is discussed. This review covers literature published mainly from 1991 to 2010.

1 Introduction

2 Metalation of Indoles

2.1 C2-Metalation of Indoles

2.2 C3-Metalation of Indoles

2.3 C4–C7-Metalation of Indoles

3 Metalation of Indazoles

4 Metalation of Benzimidazoles

5 Metalation of Azaindoles

6 Conclusion