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Reimagining Dearomatization: Arenophile-Mediated Single-Atom Insertions and π-Extensions.
Zohaib Siddiqi1, David Sarlah2
1Department of Chemistry, University of California, Berkeley, California 94720, United States.
Visible-light-promoted dearomative photocycloadditions enable the synthesis of complex molecules. This approach utilizes arenophiles to activate aromatic compounds for novel single-atom insertions and π-extension reactions, creating valuable chemical products.
Area of Science:
- Organic Chemistry
- Photochemistry
- Synthetic Methodology
Background:
- Dearomatization of simple aromatics is crucial for synthesizing value-added products from abundant feedstocks.
- Traditional arene-alkene cycloadditions often require harsh conditions, limiting their scope.
- Visible-light photocatalysis has emerged as a milder alternative for dearomative transformations.
Purpose of the Study:
- To develop novel visible-light-promoted dearomative photocycloaddition reactions.
- To explore the functionalization of transient photocycloadducts for diverse synthetic applications.
- To achieve site-selective dearomatization and π-extension in polycyclic (aza)arenes.
Main Methods:
- Visible-light activation of arenophiles for para-photocycloaddition with arenes.
- Functionalization of the resulting arene-arenophile cycloadducts.
- Application of cycloreversion to isolate functionalized π-systems.
- Development of dearomative epoxidation, cyclopropanation, and π-extension reactions.
Main Results:
- Developed a method for dearomative epoxidation of arenes and pyridines to form arene- and pyridine-oxides.
- Achieved site-selective single-atom oxygen insertion into polycyclic (aza)arenes, yielding 3-benzoxepines.
- Demonstrated dearomative cyclopropanation of polycyclic (aza)arenes, producing benzocycloheptatrienes.
- Synthesized novel nanographenes via M-region annulative π-extension (M-APEX) reactions.
Conclusions:
- Visible-light-mediated dearomative photocycloadditions offer a versatile platform for constructing complex molecular architectures.
- This methodology enables unique site-selective functionalizations and π-extensions previously inaccessible.
- The developed strategies provide access to valuable compounds, including substituted heterocycles and extended π-systems.
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