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Published on: July 28, 2022
1,2-Bis-Triazenylarenes Enable Vicinal Sandmeyer-Type Reactions
Christeena Mathew1, Anastasia Yu Gitlina1, Carl Thomas Bormann1
1Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique, Fédérale de Lausanne (EPFL), Lausanne, 1015, Switzerland.
This study introduces 1,2-bis-triazenylarenes as effective reagents for vicinal substitution reactions on arenes, overcoming limitations of traditional methods. These compounds allow sequential nucleophilic substitution, enabling diverse arene functionalization.
Area of Science:
- Organic Chemistry
- Synthetic Methodology
Background:
- Traditional Sandmeyer-type reactions face challenges with ortho-diaminoarene diazotization.
- Introducing two nucleophiles at vicinal positions of arenes requires alternative synthetic strategies.
Purpose of the Study:
- To develop a novel method for vicinal difunctionalization of arenes.
- To present 1,2-bis-triazenylarenes as versatile intermediates for nucleophilic substitution.
Main Methods:
- Synthesis of 1,2-bis-triazenylarenes via sequential functionalization of 1-amino-2-iodoarenes.
- Ruthenium-catalyzed [2+2+2] cycloaddition of diynes with 1,2-bis-triazenylalkynes.
Main Results:
- Demonstrated facile synthesis of 1,2-bis-triazenylarenes.
- Showcased sequential substitution of triazene groups by various nucleophiles (F-, Cl-, Br-, I-, N3-, OH-, MeO-, NHAc-).
Conclusions:
- 1,2-bis-triazenylarenes are effective synthons for vicinal substitution reactions.
- The developed methods provide access to diversely substituted arenes, overcoming previous synthetic hurdles.
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