Published Online: 15 SEP 2010
Copyright © 2010 John Wiley & Sons, Inc. All rights reserved.
Comprehensive Organic Name Reactions and Reagents
How to Cite
2010. Nazarov Cyclization. Comprehensive Organic Name Reactions and Reagents. 452:2011–2016.
- Published Online: 15 SEP 2010
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Nazarov cyclization, or Nazarov reaction is an acid-promoted cationic pericyclic reaction that transforms a divinyl ketone into 2-cyclopentenone. This reaction undergoes a 4-π electrocyclic, conrotatory cyclization via a 3-oxy-pentadienylic cation and requires of strong Brønsted acid or Lewis acid. Many complicated Lewis acids have been used for this reaction. This reaction gives a thermodynamically favored cyclopentenone with more substituents. Alkoxy on a vinyl group, or the presence of a bridge-headed proton on the endocyclic intermediate facilitates the protic acid-promoted cyclization. Denmark has developed the directed Nazarov cyclization and Ichikawa has developed the other form to control the regiochemistry. The interrupted Nazarov reaction has also been developed to extend the reaction of the cationic endocyclic intermediate with carbon nucleophiles.
- vinyl allenyl imine;
- Lewis acid;
- protic acid