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Synlett
DOI: 10.1055/a-2661-3958
DOI: 10.1055/a-2661-3958
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Alkynes in Organic Synthesis
Cyclooctynes as Building Blocks for the Synthesis of Arene-Annulated Eight-Membered Ring Systems
Supported by: LOEWE Program of Excellence of the Federal State of Hesse LOEWE Focus Group PriOSS ’Principles of On Surfa
Funding Information The authors acknowledge the LOEWE Program of Excellence of the Federal State of Hesse (LOEWE Focus Group PriOSS ‘Principles of On-Surface Synthesis’) for financial support.
Abstract
Arene-annulated eight-membered carbocycles constitute a unique class of molecular architectures, combining the rigidity of aromatic ring systems with the distinctive conformational features of cyclooctene-derived frameworks. Among the various synthetic routes developed to prepare these structures, Diels–Alder reactions employing cyclooctyne derivatives as dienophiles stand out for their high degree of modularity as well as functional group tolerance. Herein, we provide an overview of these Diels–Alder-based strategies by comparing commonly employed strained alkyne dienophiles and classifying different types of diene systems. This systematic compilation of synthetic methods may help guide future developments in the synthesis of polycyclic structures containing eight-membered rings and foster their usage in functional materials and biological applications.
Keywords
Cycloaddition - Strained alkynes - Cyclooctyne - Diels–Alder reaction - Skeletal editing - Polycyclic aromatic hydrocarbonsPublication History
Received: 26 June 2025
Accepted after revision: 20 July 2025
Accepted Manuscript online:
20 July 2025
Article published online:
04 September 2025
© 2025. Thieme. All rights reserved.
Georg Thieme Verlag KG
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