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
Key words
radical cyclization - tributyltin hydride - cascade cyclization - nitrogen heterocycles - radical relay cyclization - atom-transfer radical cyclization - tandem radical cyclization - oxidative radical cyclization