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Published on: June 21, 2017
Gold(I)-Catalyzed Allenyl Cope Rearrangement: Evolution from Asynchronicity to Trappable Intermediates Assisted by
Dinesh V Vidhani1, Marie E Krafft1, Igor V Alabugin1
1Department of Chemistry & Biochemistry, Florida State University , Tallahassee, Florida 32306, United States.
This study introduces novel strategies using gold(I) catalysis to interrupt concerted pericyclic reactions, enabling new cascade transformations. By controlling electronic and stereoelectronic factors, chemists can now access interrupted Cope rearrangements.
Area of Science:
- Organic Chemistry
- Catalysis
- Reaction Mechanisms
Background:
- Pericyclic reactions proceed through concerted bond formation and cleavage, avoiding high-energy intermediates.
- Understanding reaction pathways is crucial for designing efficient synthetic strategies.
Purpose of the Study:
- To develop strategies for uncoupling bond formation and cleavage in pericyclic reactions.
- To convert concerted pericyclic processes into their "interrupted" versions using Au(I) catalysis.
- To explore the influence of electronic and stereoelectronic factors on reaction pathways.
Main Methods:
- Utilizing Au(I) catalysis in combination with specific structural and electronic modifications.
- Investigating the role of C3-C4 bond alignment with adjacent π systems.
- Analyzing the impact of fluorine substitution at the C3 position on reaction mechanisms.
Main Results:
- Two strategies were developed to interrupt concerted pericyclic reactions.
- The boat conformation prevented concerted scission of the central σ bond by controlling C3-C4 bond alignment.
- Fluorine introduction at C3 altered the rate-determining step and demonstrated stereoelectronic dependence, with equatorial C-F bonds showing greater destabilization.
Conclusions:
- Au(I) catalysis combined with stereoelectronic gating via C-F bonds allows for the interruption of pericyclic reactions.
- This approach delays central bond scission, enabling access to interrupted Cope rearrangements.
- The findings expand the scope of pericyclic reactions for designing novel cascade transformations.
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