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Updated: May 1, 2026

A Two-Step Protocol for Umpolung Functionalization of Ketones Via Enolonium Species
Published on: August 16, 2018
Palladium-catalyzed C-S activation/aryne insertion/coupling sequence: synthesis of functionalized 2-quinolinones
This study introduces a new palladium-catalyzed reaction using arynes and ketene dithioacetals to synthesize functionalized 2-quinolinones. This method offers a selective and efficient route to valuable heterocyclic compounds.
Area of Science:
- Organic Chemistry
- Catalysis
- Heterocyclic Chemistry
Background:
- Aryne chemistry is crucial for C-C and C-heteroatom bond formation.
- Palladium catalysis offers efficient and selective synthetic routes.
- 2-Quinolinones are important heterocyclic scaffolds with diverse biological activities.
Purpose of the Study:
- To develop a novel synthetic strategy for functionalized 2-quinolinones.
- To explore the reaction between arynes and α-carbamoyl ketene dithioacetals.
- To achieve selective synthesis via C-S bond activation and intramolecular coupling.
Main Methods:
- Palladium(II) acetate (Pd(OAc)₂) catalyzed reaction.
- Utilizing arynes and α-carbamoyl ketene dithioacetals as starting materials.
- Employing a C-S activation/aryne insertion/intramolecular coupling sequence.
Main Results:
- Selective formation of functionalized 2-quinolinones in high yields.
- Demonstrated compatibility with a wide range of substrates.
- Suppression of undesired nucleophilic addition to arynes.
Conclusions:
- A novel and efficient palladium-catalyzed method for 2-quinolinone synthesis is established.
- The strategy enables the preparation of versatile alkythio-substituted quinolinone products.
- This approach provides a valuable tool for constructing complex heterocyclic molecules.
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