Synthesis 2014; 46(22): 3004-3023
DOI: 10.1055/s-0034-1379303
short review
© Georg Thieme Verlag Stuttgart · New York

Recent Advances in Transition-Metal-Catalyzed Denitrogenative Transformations­ of 1,2,3-Triazoles and Related Compounds

Pazhamalai Anbarasan*
Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India   Fax: +91(44)22574202   Email: anbarasansp@iitm.ac.in
,
Dongari Yadagiri
Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India   Fax: +91(44)22574202   Email: anbarasansp@iitm.ac.in
,
Shanmugam Rajasekar
Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India   Fax: +91(44)22574202   Email: anbarasansp@iitm.ac.in
› Author Affiliations
Further Information

Publication History

Received: 30 August 2014

Accepted: 22 September 2014

Publication Date:
23 October 2014 (online)


Abstract

Suitably substituted electron-deficient 1,2,3-triazoles exist in equilibrium with their ring-opened α-diazoimine tautomers. This phenomenon was used to facilitate the generation of synthetically useful metallo azavinyl carbene intermediates. In this short review, we describe recent developments in the transition-metal-catalyzed decomposition of electron-deficient (annulated) 1,2,3-triazoles to form metallo azavinyl carbenes, and their application in the synthesis of highly functionalized nitrogen-based heterocycles and building blocks through various synthetic transformations, such as transannulation, cyclopropanations, insertion reactions, ylide formation/rearrangements, and ring expansions.

1 Introduction

2 Ring–Chain Isomerism

3 Synthesis of N-Sulfonyl-1,2,3-triazoles

4 Denitrogenative Transformations of 1,2,3-Triazoles

4.1 Transannulations with Nitriles and Alkynes

4.2 Transannulations with Alkenes or Carbonyl Compounds

4.3 Transannulations with (Hetero)cumulenes or 1,3-Dienes

4.4 Insertions into X–H or C–X bonds

4.5 Rearrangement/Ring Expansion

4.6 Miscellaneous Transformations

5 Summary and Outlook