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Ynamides as Three-Atom Components in Cycloadditions: An Unexplored Chemical Reaction Space
Dominic Campeau1, Alice Pommainville1, Fabien Gagosz1
1Department of Chemistry and Biomolecular Sciences, University of Ottawa, K1N 6N5, Ottawa, Canada.
Ynamides act as neutral three-atom components (TACs) in (3+2) cycloadditions with alkynes. This reaction efficiently synthesizes functionalized pyrroles via a novel pathway, expanding heterocyclic chemistry.
Area of Science:
- Organic Chemistry
- Heterocyclic Chemistry
Background:
- 1,3-dipolar cycloadditions are well-established synthetic tools.
- The use of neutral three-atom components (TACs) in (3+2) cycloadditions is less explored.
- Ynamides are versatile π systems with growing interest.
Purpose of the Study:
- To explore the reactivity of ynamides as neutral TACs in (3+2) cycloaddition reactions.
- To develop a novel synthetic route to functionalized pyrroles.
- To investigate the mechanism of ynamide-alkyne cycloadditions.
Main Methods:
- Thermally induced intramolecular (3+2) cycloaddition reactions.
- Utilizing ynamides as neutral three-atom components (TACs).
- Reaction with internal alkynes to form pyrrole products.
Main Results:
- Ynamides successfully participate as neutral TACs in (3+2) cycloadditions with alkynes.
- A variety of functionalized pyrroles were synthesized.
- The reaction proceeds stepwise through a pyrrolium ylide intermediate.
Conclusions:
- Ynamides represent an unexplored class of neutral TACs for (3+2) cycloadditions.
- This transformation offers a new pathway for synthesizing functionalized pyrroles.
- The discovered ynamide reactivity holds significant potential for heterocyclic chemistry.
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
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Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation
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