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Catalytic Alkyne Reactions
Research Guide
What is Catalytic Alkyne Reactions?
Catalytic alkyne reactions are transition metal-catalyzed transformations of alkynes, particularly gold-catalyzed processes including cycloisomerization, hydroamination, and C-C bond formation in organic synthesis.
This field encompasses 26,659 papers on gold-catalyzed reactions of alkynes for heterocycle synthesis and enantioselective transformations. Key processes involve homogeneous catalysis with gold, platinum, and other metals activating alkyne π-bonds. Gold-catalyzed cycloisomerizations of enynes proceed via carbophilic activation mechanisms.
Topic Hierarchy
Research Sub-Topics
Gold-Catalyzed Cycloisomerization of Alkynes
This sub-topic focuses on gold(I) complexes activating alkyne π-bonds for intramolecular cyclizations forming carbo- and heterocycles. Researchers investigate mechanistic pathways, ligand effects, and synthetic scope for complex molecule assembly.
Gold-Catalyzed Hydroamination of Alkynes
Studies explore nucleophilic addition of amines to alkynes promoted by gold catalysts, yielding enamines and heterocycles. Research emphasizes regioselectivity, substrate scope, and applications in alkaloid synthesis.
Ligand Effects in Homogeneous Gold Catalysis
Researchers examine how phosphine, NHC, and other ligands modulate gold catalyst activity, selectivity, and stability in alkyne transformations. Work includes computational modeling and structure-activity relationships.
Gold π-Acid Catalyzed Alkyne Activation
This area investigates gold's carbophilic π-acid properties for alkyne activation in nucleophilic additions and rearrangements. Studies detail intermediates like slipped carbocations via spectroscopy and DFT.
Enantioselective Gold-Catalyzed Alkyne Reactions
Focuses on chiral gold complexes and ligands enabling asymmetric cyclizations and additions to alkynes. Researchers develop methodologies for high ee values and apply to chiral heterocycle synthesis.
Why It Matters
Catalytic alkyne reactions enable efficient construction of complex molecules used in pharmaceuticals and materials. "Cu-Catalyzed Azide−Alkyne Cycloaddition" by Meldal and Tornøe (2008) established the copper-catalyzed click reaction, which has been applied in bioconjugation with over 4,466 citations reflecting its impact on drug discovery and biomaterials. Gold catalysis in "Gold-Catalyzed Cycloisomerizations of Enynes: A Mechanistic Perspective" by Jiménez-Núñez and Echavarren (2008) supports synthesis of heterocycles, as seen in natural product analogs, reducing synthetic steps compared to traditional methods.
Reading Guide
Where to Start
"Gold-Catalyzed Organic Reactions" by Hashmi (2007), as it provides a broad foundation on gold catalysis mechanisms and alkyne applications before specialized topics.
Key Papers Explained
"Gold-Catalyzed Organic Reactions" by Hashmi (2007) introduces general gold catalysis, which Fürstner and Davies (2007) in "Catalytic Carbophilic Activation: Catalysis by Platinum and Gold π Acids" expand to π-acid mechanisms; Jiménez-Núñez and Echavarren (2008) in "Gold-Catalyzed Cycloisomerizations of Enynes: A Mechanistic Perspective" apply these to enynes, while Gorin, Sherry, and Toste (2008) in "Ligand Effects in Homogeneous Au Catalysis" detail ligand tuning; Li, Brouwer, and He (2008) in "Gold-Catalyzed Organic Transformations" connect to practical transformations.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Recent emphasis remains on mechanistic refinement in gold π-activation, as no new preprints are available; focus persists on ligand effects and selectivity from 2008 Chemical Reviews papers.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Cu-Catalyzed Azide−Alkyne Cycloaddition | 2008 | Chemical Reviews | 4.5K | ✕ |
| 2 | Gold-Catalyzed Organic Reactions | 2007 | Chemical Reviews | 3.2K | ✕ |
| 3 | Handbook of Organopalladium Chemistry for Organic Synthesis | 2002 | — | 2.9K | ✕ |
| 4 | Transition‐Metal‐Catalyzed Direct Arylation of (Hetero)Arenes ... | 2009 | Angewandte Chemie Inte... | 2.7K | ✕ |
| 5 | New Pd(II)- and Ni(II)-Based Catalysts for Polymerization of E... | 1995 | Journal of the America... | 2.6K | ✕ |
| 6 | C–H bond activation enables the rapid construction and late-st... | 2013 | Nature Chemistry | 2.3K | ✕ |
| 7 | Catalytic Carbophilic Activation: Catalysis by Platinum and Go... | 2007 | Angewandte Chemie Inte... | 2.3K | ✕ |
| 8 | Gold-Catalyzed Cycloisomerizations of Enynes: A Mechanistic Pe... | 2008 | Chemical Reviews | 2.0K | ✕ |
| 9 | Ligand Effects in Homogeneous Au Catalysis | 2008 | Chemical Reviews | 2.0K | ✓ |
| 10 | Gold-Catalyzed Organic Transformations | 2008 | Chemical Reviews | 1.9K | ✕ |
Frequently Asked Questions
What is gold-catalyzed cycloisomerization of alkynes?
Gold-catalyzed cycloisomerization activates alkyne π-bonds through carbophilic coordination, leading to intramolecular cyclization. "Gold-Catalyzed Cycloisomerizations of Enynes: A Mechanistic Perspective" by Jiménez-Núñez and Echavarren (2008) details mechanisms involving gold-stabilized carbocations. These reactions form heterocycles efficiently under mild conditions.
How does ligand choice affect homogeneous gold catalysis?
Ligands modulate gold catalyst reactivity and selectivity in alkyne transformations. "Ligand Effects in Homogeneous Au Catalysis" by Gorin, Sherry, and Toste (2008) shows phosphine and N-heterocyclic carbene ligands influence reaction pathways. This control enables regioselective hydroamination and C-C bond formation.
What role does gold play in carbophilic activation?
Gold acts as a soft π-acid, coordinating to alkyne triple bonds to generate nucleophilic carbocations. "Catalytic Carbophilic Activation: Catalysis by Platinum and Gold π Acids" by Fürstner and Davies (2007) compares gold and platinum in enyne cycloisomerizations. These activations drive atom-economical organic transformations.
What are applications of Cu-catalyzed azide-alkyne cycloaddition?
Cu-catalyzed azide-alkyne cycloaddition forms 1,4-triazoles rapidly under mild conditions. "Cu-Catalyzed Azide−Alkyne Cycloaddition" by Meldal and Tornøe (2008) reports high yields without copper residues in biomolecules. It is widely used in ligation of peptides and DNA labeling.
What mechanisms govern gold-catalyzed enyne reactions?
Mechanisms involve gold coordination to alkynes, forming cyclopropylmethyl cations or π-allyl intermediates. "Gold-Catalyzed Organic Reactions" by Hashmi (2007) reviews proto-demetalation steps completing catalysis. These pathways support diverse cycloisomerization products.
Open Research Questions
- ? How can ligand design improve enantioselectivity in gold-catalyzed alkyne hydroamination?
- ? What intermediates control regioselectivity in gold-catalyzed enyne cycloisomerizations?
- ? Can carbophilic activation mechanisms be extended to non-precious metal catalysts for alkyne transformations?
- ? How do steric effects influence skeletal reorganization in gold-catalyzed alkyne cascades?
- ? What factors limit turnover numbers in homogeneous gold catalysis of C-C bond formation from alkynes?
Recent Trends
The field includes 26,659 works with sustained interest in gold-catalyzed alkyne processes since major 2007-2008 reviews like Hashmi and Jiménez-Núñez and Echavarren (2008).
2007No growth rate data or recent preprints/news indicate stable activity without specified acceleration.
Citation leaders such as "Cu-Catalyzed Azide−Alkyne Cycloaddition" by Meldal and Tornøe with 4,466 citations underscore ongoing reliance on established methods.
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