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Cyclization and Aryne Chemistry
Research Guide
What is Cyclization and Aryne Chemistry?
Cyclization and Aryne Chemistry is the study of aryne intermediates, highly reactive triple-bonded aromatic species, and their applications in organic synthesis including cyclization reactions, transition-metal-free processes, natural product total synthesis, multicomponent coupling, and Diels-Alder cycloadditions.
This field encompasses 9,910 published works focused on aryne generation, reactivity, and synthetic utility in constructing heterocycles, polycyclic aromatic compounds, and complex natural products. Key aspects include regioselectivities in aryne reactions and methods like fluoride-induced elimination from o-trimethylsilylphenyl triflate. Applications span Diels-Alder reactions, benzyne trapping, and total synthesis, with historical developments reviewed across decades.
Topic Hierarchy
Research Sub-Topics
Transition-Metal-Free Aryne Generation
This sub-topic develops fluoride-mediated, thermal, and diazotization methods to generate arynes from o-silyl triflates, o-diazonium salts, and ortho-haloarenes without metal catalysts. Researchers study generation efficiency, regioselectivity, and orthogonal activation.
Aryne Multicomponent Coupling Reactions
Studies explore three-component couplings of arynes with nucleophiles and electrophiles forming heterocycles, allenes, and polysubstituted benzenes in one pot. Focus includes chemo- and stereoselectivity control and cascade reaction design.
[2+2] and [2+4] Cycloadditions with Arynes
This area investigates aryne Diels-Alder reactions with dienes and [2+2] cycloadditions with alkenes/alkynes yielding benzocyclobutenes and tetralins. Research analyzes distortion energies, regioselectivity, and strained product reactivity.
Aryne Insertion into Polar Bonds
Researchers examine aryne dearomative insertions into C-X bonds (X = O, N, S) forming benzoxazoles, phenoxathiins, and spiroketals with high regioselectivity. Mechanistic studies employ DFT and kinetic isotope effects.
Regioselectivity in Unsymmetrical Aryne Reactions
This sub-topic addresses electronic and steric control of nucleophile addition to 3-substituted arynes using directing groups, fluoride effects, and computational models. Applications target specific substitution patterns in pharmaceuticals.
Why It Matters
Aryne chemistry enables efficient construction of complex molecular architectures without transition metals, impacting natural product total synthesis and pharmaceutical development. Tadross and Stoltz (2012) in "A Comprehensive History of Arynes in Natural Product Total Synthesis" document its use in over 100 syntheses, including alkaloids and polyketides, demonstrating regioselective annulations for polycyclic scaffolds. Himeshima et al. (1983) established mild benzyne generation via fluoride-induced 1,2-elimination of o-trimethylsilylphenyl triflate, facilitating 912-cited applications in heterocycle synthesis and multicomponent couplings essential for drug discovery pipelines.
Reading Guide
Where to Start
"FLUORIDE-INDUCED 1,2-ELIMINATION OF O-TRIMETHYLSILYLPHENYL TRIFLATE TO BENZYNE UNDER MILD CONDITIONS" by Himeshima et al. (1983) introduces a practical aryne generation method with 912 citations, providing experimental foundation before theoretical or synthetic applications.
Key Papers Explained
Himeshima et al. (1983) "FLUORIDE-INDUCED 1,2-ELIMINATION OF O-TRIMETHYLSILYLPHENYL TRIFLATE TO BENZYNE UNDER MILD CONDITIONS" establishes benzyne generation, foundational for Tadross and Stoltz (2012) "A Comprehensive History of Arynes in Natural Product Total Synthesis" which catalogs its applications (848 citations). Bickelhaupt and Houk (2017) "Analyzing Reaction Rates with the Distortion/Interaction‐Activation Strain Model" (1561 citations) then provides computational analysis of aryne reaction barriers, building on experimental regioselectivities. Hoffmann et al. (1968) "Benzynes, dehydroconjugated molecules, and the interaction of orbitals separated by a number of intervening sigma bonds" (675 citations) and Jones and Bergman (1972) "p-Benzyne..." (661 citations) offer early theoretical and structural insights connecting to modern synthesis.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Current work builds on regioselectivities and transition-metal-free couplings from the 9,910 papers, with Tadross and Stoltz (2012) highlighting ongoing natural product applications. No recent preprints or news available, so frontiers remain in extending distortion/interaction models to asymmetric aryne processes and polycyclic heterocycle synthesis.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Analyzing Reaction Rates with the Distortion/Interaction‐Activ... | 2017 | Angewandte Chemie Inte... | 1.6K | ✓ |
| 2 | Chemistry and Biology of the Enediyne Anticancer Antibiotics | 1991 | Angewandte Chemie Inte... | 981 | ✕ |
| 3 | Synthesis and Properties of Allenic Natural Products and Pharm... | 2004 | Angewandte Chemie Inte... | 921 | ✕ |
| 4 | FLUORIDE-INDUCED 1,2-ELIMINATION OF <i>O</i>-TRIMETHYLSILYLPHE... | 1983 | Chemistry Letters | 912 | ✕ |
| 5 | Modern Acetylene Chemistry | 1995 | — | 892 | ✕ |
| 6 | A Comprehensive History of Arynes in Natural Product Total Syn... | 2012 | Chemical Reviews | 848 | ✕ |
| 7 | Aromaticity as a Cornerstone of Heterocyclic Chemistry | 2004 | Chemical Reviews | 774 | ✕ |
| 8 | The Chemistry of Double-Bonded Functional Groups | 1997 | — | 678 | ✕ |
| 9 | Benzynes, dehydroconjugated molecules, and the interaction of ... | 1968 | Journal of the America... | 675 | ✕ |
| 10 | p-Benzyne. Generation as an intermediate in a thermal isomeriz... | 1972 | Journal of the America... | 661 | ✕ |
Frequently Asked Questions
What is a common method to generate arynes under mild conditions?
Himeshima et al. (1983) in "FLUORIDE-INDUCED 1,2-ELIMINATION OF O-TRIMETHYLSILYLPHENYL TRIFLATE TO BENZYNE UNDER MILD CONDITIONS" report fluoride-induced 1,2-elimination of o-trimethylsilylphenyl triflate as a convenient route to benzyne. This process involves detriflation from an intermediary aryl anion, occurring preferentially over protonation even in alcohols. The method supports transition-metal-free reactions central to modern aryne chemistry.
How have arynes been used in natural product total synthesis?
Tadross and Stoltz (2012) in "A Comprehensive History of Arynes in Natural Product Total Synthesis" survey aryne applications across numerous total syntheses of complex targets. Arynes enable regioselective cyclizations and annulations to form polycyclic frameworks in alkaloids and other natural products. This approach has been pivotal in constructing intricate carbon skeletons without metal catalysts.
What role do arynes play in Diels-Alder reactions?
Arynes serve as dienophiles in Diels-Alder cycloadditions, yielding cycloadducts with dienes for polycyclic aromatic synthesis. The field's description highlights arynes in such reactions alongside multicomponent couplings. Regioselectivity control in these processes supports heterocycle construction.
What theoretical models analyze aryne reaction rates?
Bickelhaupt and Houk (2017) in "Analyzing Reaction Rates with the Distortion/Interaction‐Activation Strain Model" introduce a model decomposing activation energies into distortion and interaction components for bimolecular reactions involving arynes. This quantifies reactant deformation to transition state geometries plus stabilization energies. The tool applies to aryne cycloadditions and insertions.
What is the historical evidence for p-benzyne as a reactive intermediate?
Jones and Bergman (1972) in "p-Benzyne. Generation as an intermediate in a thermal isomerization reaction and trapping evidence for the 1,4-benzenediyl structure" generated p-benzyne thermally and trapped it, confirming its 1,4-benzenediyl structure. This provided direct evidence for dehydroconjugated aryne species. The work advanced understanding of aryne reactivity beyond ortho-benzyne.
Open Research Questions
- ? How can regioselectivity in aryne insertions be predicted and controlled without directing groups?
- ? What mechanisms govern distortion energies in aryne Diels-Alder reactions per activation strain models?
- ? Can aryne multicomponent couplings be extended to asymmetric synthesis of heterocycles?
- ? What are the limits of thermal stability for p-benzyne and higher dehydrobenzynes?
- ? How do orbital interactions in arynes influence reactivity across sigma-bond separations?
Recent Trends
The field maintains 9,910 works with no specified 5-year growth rate, reflecting sustained interest in aryne-enabled synthesis.
Recent citations favor Bickelhaupt and Houk at 1561 for reaction analysis and Tadross and Stoltz (2012) at 848 for total synthesis history.
2017No preprints or news in the last 12 months indicate steady progress without public announcements.
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