Synthesis 2012; 44(16): 2475-2505
DOI: 10.1055/s-0032-1316566
review
© Georg Thieme Verlag Stuttgart · New York

Formation of Five- and Six-Membered Heterocyclic Rings under Radical Cyclization Conditions

K. C. Majumdar*
a   Department of Chemical Sciences, Tezpur University, Napaam, Tezpur 784024, Assam, India
b   Department of Chemistry, University of Kalyani, Kalyani 741235, India, Fax: +91(33)25827521   Email: kcm@klyuniv.ac.in
,
Galla V. Karunakar
a   Department of Chemical Sciences, Tezpur University, Napaam, Tezpur 784024, Assam, India
,
Biswajit Sinha
b   Department of Chemistry, University of Kalyani, Kalyani 741235, India, Fax: +91(33)25827521   Email: kcm@klyuniv.ac.in
› Author Affiliations
Further Information

Publication History

Received: 23 March 2012

Accepted after revision: 14 May 2012

Publication Date:
27 July 2012 (online)


Abstract

This review describes the formation of five- and six-membered heterocyces in various organic molecules by radical cyclization­ and covers the progress made on the topic during the period­ of 2008 through 2010.

1 Introduction

2 Reagents, Solvents, Radical Initiators, and Reactivity

3 General Mechanistic Pathways: Regio- and Stereoselectivity

4 Synthesis of Nitrogen Heterocycles

4.1 Nitrogen-Centered Radical Cyclizations

4.2 N-Vinylic and Related Systems

4.3 N-Allylic and Related Systems

4.4 N-Alkyl and Related Systems

4.5 Diastereoselective Radical Cyclizations

4.6 Cascade and Tandem Radical Cyclizations

4.7 Atom- and Group-Transfer Radical Cyclizations

4.8 Oxidative Radical Cyclizations

4.9 Miscellaneous

5 Synthesis of Oxygen Heterocycles

5.1 Diastereoselective Radical Cyclizations

5.2 Miscellaneous

6 Synthesis of Sulfur Heterocycles

7 Synthesis of Silicon Heterocycles

8 Miscellaneous

9 Conclusions