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Updated: Jun 2, 2026

Metal-free Synthesis of Ynones from Acyl Chlorides and Potassium Alkynyltrifluoroborate Salts
Published on: February 24, 2015
Syntheses of α-pyrones using gold-catalyzed coupling reactions
Tuoping Luo1, Mingji Dai, Shao-Liang Zheng
1Howard Hughes Medical Institute, Broad Institute of Harvard and MIT, Cambridge, Massachusetts 02142, United States.
Gold(I) catalysts facilitate sequential alkyne activation, forming α-pyrone structures. New cascade reactions with propiolic acids create diverse α-pyrone compounds.
Area of Science:
- Organic Chemistry
- Catalysis
- Synthetic Methodology
Background:
- Gold catalysis is a powerful tool in organic synthesis.
- Cascade reactions offer efficient pathways to complex molecules.
- α-Pyrones are important heterocyclic compounds with various applications.
Purpose of the Study:
- To develop novel cascade reactions for synthesizing α-pyrone skeletons.
- To explore the sequential alkyne activation of terminal alkynes and propiolic acids using gold(I) catalysts.
- To investigate the formation of α-pyrones with diverse substitution patterns.
Main Methods:
- Utilizing gold(I) catalysts for sequential alkyne activation.
- Employing propiolic acids as key substrates in cascade reactions.
- Characterizing the resulting α-pyrone products using standard analytical techniques.
Main Results:
- Successful synthesis of α-pyrone compounds through sequential alkyne activation.
- Discovery of novel cascade reaction pathways involving propiolic acids.
- Generation of α-pyrones with varied substitution patterns, demonstrating synthetic versatility.
Conclusions:
- Gold(I)-catalyzed sequential alkyne activation provides an efficient route to α-pyrone skeletons.
- The reported cascade reactions offer a novel method for constructing substituted α-pyrones.
- This methodology expands the synthetic toolbox for accessing valuable heterocyclic compounds.
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Preparation of Alkynes: Alkylation Reaction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.