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Exploring Interrupted Nazarov Cyclizations Using Tethered Sulfonamide Nucleophiles: Insights into Capture Pathways.
Aleksa Milosavljevic1, Jackson J Hernandez1, Patrycia K Zybura1
1Department of Chemistry, University of Rochester, Rochester, NY 14627.
Ionization of aza-alkynyl-Prins adducts yields unexpected outcomes due to competing halo-Nazarov and imino-Nazarov pathways. This study expands the synthetic utility of 3-halo-pentadienyl cation intermediates.
Area of Science:
- Organic Chemistry
- Reaction Mechanisms
- Computational Chemistry
Background:
- The Prins reaction and Nazarov cyclization are fundamental organic transformations.
- Aza-Prins adducts offer unique reactivity compared to their oxygen analogs.
- Understanding competing reaction pathways is crucial for synthetic control.
Purpose of the Study:
- To investigate the reaction outcomes of ionized aza-alkynyl-Prins adducts.
- To elucidate the mechanism behind unexpected reactivity in nitrogen-containing systems.
- To expand the synthetic applications of 3-halo-pentadienyl cation intermediates.
Main Methods:
- Experimental studies involving ionization of aza-alkynyl-Prins adducts.
- Comparative analysis with oxygen-containing (oxa-Prins) derivatives.
- Computational analysis to reveal reaction mechanisms.
Main Results:
- Demonstrated distinct reaction outcomes for aza-alkynyl-Prins adducts compared to oxa-Prins systems.
- Identified competing halo-Nazarov and imino-Nazarov pathways.
- Elucidated the intricate mechanism involving 3-halo-pentadienyl cation intermediates.
Conclusions:
- The ionization of aza-alkynyl-Prins adducts proceeds through complex, competing pathways.
- Nitrogen-containing systems exhibit unique reactivity, expanding synthetic possibilities.
- Findings enhance the understanding and utility of halo-pentadienyl cation chemistry.
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