Subtopic Deep Dive
Aryne Insertion into Polar Bonds
Research Guide
What is Aryne Insertion into Polar Bonds?
Aryne insertion into polar bonds refers to the dearomative insertion of aryne intermediates into C-X σ-bonds (X = O, N, S) to form heterocycles like benzoxazoles, phenoxathiins, and spiroketals with high regioselectivity.
This process expands aryne reactivity beyond pericyclic cycloadditions by enabling strain-driven insertions into polar bonds. Mechanistic insights derive from DFT computations and kinetic isotope effects, as demonstrated in early examples like C(sp)-O(sp3) insertions (Łączkowski et al., 2011, 54 citations). Over 10 key papers since 1973 document regioselective syntheses and applications in heterocycle construction.
Why It Matters
Aryne polar bond insertions enable efficient synthesis of bioactive heterocycles, such as benzoxazoles for pharmaceuticals, bypassing multi-step phenol-based routes (Miyabe, 2015, 53 citations). These methods support natural product synthesis, including homophthalic acids via aryne pathways (Guyot and Molho, 1973, 42 citations). Applications extend to anticancer enediyne derivatives and multifunctional arenes for materials (Gredičak and Jerić, 2007, 68 citations; He et al., 2020, 124 citations).
Key Research Challenges
Regioselectivity Control
Achieving predictable regiochemistry in aryne insertions into unsymmetrical polar bonds remains difficult due to competing pathways. Łączkowski et al. (2011, 54 citations) used DFT to rationalize selectivity in C(sp)-O insertions, but generalization across substrates is limited. Experimental optimization often requires extensive screening.
Mechanistic Elucidation
Distinguishing concerted insertion from stepwise addition/nucleophilic mechanisms requires advanced probes like kinetic isotope effects. Bickelhaupt and Houk (2017, 1561 citations) applied distortion/interaction models to similar strains, highlighting needs for aryne-specific activation strain analyses. Few studies integrate both DFT and experimental kinetics.
Substrate Scope Expansion
Extending insertions beyond O/N to P/Se bonds faces chemoselectivity issues with multifunctional precursors. García-López et al. (2015, 91 citations) achieved three-component couplings, but yields drop with sterically hindered systems. Developing precursors like boryl-arynes addresses orthogonality (Demory et al., 2015, 61 citations).
Essential Papers
Analyzing Reaction Rates with the Distortion/Interaction‐Activation Strain Model
F. Matthias Bickelhaupt, K. N. Houk · 2017 · Angewandte Chemie International Edition · 1.6K citations
Abstract The activation strain or distortion/interaction model is a tool to analyze activation barriers that determine reaction rates. For bimolecular reactions, the activation energies are the sum...
Uncovering the Neglected Similarities of Arynes and Donor–Acceptor Cyclopropanes
Daniel B. Werz, Akkattu T. Biju · 2019 · Angewandte Chemie International Edition · 276 citations
Abstract Arynes and donor–acceptor (D–A) cyclopropanes are two classes of strained systems having the potential for numerous applications in organic synthesis. The last two decades have witnessed a...
Strategies toward Aryne Multifunctionalization via 1,2-Benzdiyne and Benzyne
Jia He, Dachuan Qiu, Yang Li · 2020 · Accounts of Chemical Research · 124 citations
Polysubstituted arenes are prevalent in numerous natural products, medicines, agrochemicals, and organic functional materials. Among methods to prepare polysubstituted arenes, pathways involving be...
Double Heteroatom Functionalization of Arenes Using Benzyne Three‐Component Coupling
José-Antonio Garcı́a-López, Meliha Çetin, Michael F. Greaney · 2015 · Angewandte Chemie International Edition · 91 citations
Abstract Arynes participate in three‐component coupling reactions with N, S, P, and Se functionalities to yield 1,2‐heteroatom‐difunctionalized arenes. Using 2‐iodophenyl arylsulfonates as benzyne ...
Enediyne compounds - new promises in anticancer therapy
Matija Gredičak, Ivanka Jerić · 2007 · Acta Pharmaceutica · 68 citations
Enediyne compounds - new promises in anticancer therapy Scientists of all kinds have long been intrigued by the nature, action and potential of natural toxins that possess exceptional antibacterial...
Boryl (Hetero)aryne Precursors as Versatile Arylation Reagents: Synthesis through CH Activation and Orthogonal Reactivity
Emilien Demory, Karthik Devaraj, Andreas Orthaber et al. · 2015 · Angewandte Chemie International Edition · 61 citations
Abstract (Pinacolato)boryl ortho ‐silyl(hetero)aryl triflates are presented as a new class of building blocks for arylation. They demonstrate unique versatility by delivering boronate or (hetero)ar...
Highly Selective Insertion of Arynes into a C(sp)−O(sp<sup>3</sup>) σ Bond
Krzysztof Z. Łączkowski, Diego García, Diego Peña et al. · 2011 · Organic Letters · 54 citations
Arynes react with ethoxyacetylene to afford 2-ethoxyethynylaryl derivatives through a highly chemo- and regioselective formal insertion of the aryne into the C(sp)−O(sp3) bond of the alkyne. Comput...
Reading Guide
Foundational Papers
Start with Łączkowski et al. (2011, 54 citations) for C(sp)-O insertion example with DFT; Guyot/Molho (1973, 42 citations) for early homophthalic acid synthesis; Li et al. (2014, 44 citations) for double bond insertions leading to quinomethides.
Recent Advances
Werz/Biju (2019, 276 citations) compares arynes to cyclopropanes; He et al. (2020, 124 citations) on multifunctionality; García-López et al. (2015, 91 citations) for heteroatom difunctionalization.
Core Methods
Benzyne generation from o-silyl triflates or iodophenyl sulfonates; regioselective insertions probed by DFT (Bickelhaupt/Houk activation strain) and three-component couplings with nucleophiles.
How PapersFlow Helps You Research Aryne Insertion into Polar Bonds
Discover & Search
PapersFlow's Research Agent uses searchPapers to query 'aryne insertion polar bonds regioselectivity' yielding Łączkowski et al. (2011) as top hit (54 citations), then citationGraph reveals forward citations like Miyabe (2015) and Werz/Biju (2019, 276 citations) for mechanistic parallels. exaSearch uncovers niche DFT studies, while findSimilarPapers links to He et al. (2020) on multifunctionality.
Analyze & Verify
Analysis Agent employs readPaperContent on Łączkowski et al. (2011) to extract DFT geometries, followed by verifyResponse (CoVe) to cross-check regioselectivity claims against Bickelhaupt/Houk (2017) distortion models. runPythonAnalysis parses kinetic data from García-López et al. (2015) into pandas for rate comparisons, with GRADE scoring evidence strength for insertion vs. addition mechanisms.
Synthesize & Write
Synthesis Agent detects gaps in regioselectivity for S-bonds by flagging inconsistencies across Miyabe (2015) and Li et al. (2014), proposing testable hypotheses. Writing Agent uses latexEditText to draft schemes of aryne C-O insertions, latexSyncCitations to integrate 10+ references, and latexCompile for publication-ready reviews; exportMermaid visualizes mechanistic pathways from DFT data.
Use Cases
"Plot distortion energies from Bickelhaupt aryne papers using Python."
Research Agent → searchPapers('distortion interaction aryne') → Analysis Agent → readPaperContent(Bickelhaupt 2017) → runPythonAnalysis(NumPy/matplotlib to recreate activation strain plots) → researcher gets publication-quality energy diagrams.
"Draft LaTeX review on aryne C-O insertions with schemes."
Synthesis Agent → gap detection(Lączkowski 2011 + Miyabe 2015) → Writing Agent → latexGenerateFigure(aryne insertion scheme) → latexSyncCitations(9 papers) → latexCompile → researcher gets compiled PDF with cited mechanisms.
"Find GitHub code for aryne DFT simulations."
Research Agent → paperExtractUrls(Lączkowski 2011) → paperFindGithubRepo → githubRepoInspect(DFT scripts) → researcher gets runnable Gaussian input files for polar bond insertions.
Automated Workflows
Deep Research workflow scans 50+ aryne papers via searchPapers → citationGraph, generating structured reports on polar bond trends with GRADE-verified claims from Bickelhaupt/Houk (2017). DeepScan applies 7-step analysis to Łączkowski et al. (2011), using CoVe checkpoints for DFT validation and runPythonAnalysis for energy profiles. Theorizer synthesizes insertion mechanisms into hypotheses testable by kinetic isotope effects.
Frequently Asked Questions
What defines aryne insertion into polar bonds?
Aryne insertion involves dearomative addition into C-X σ-bonds (X=O,N,S), forming heterocycles via strain release, distinct from [2+2] cycloadditions (Łączkowski et al., 2011).
What methods characterize these insertions?
DFT computations predict regioselectivity, supported by kinetic isotope effects; distortion/interaction models analyze barriers (Bickelhaupt/Houk, 2017; Łączkowski et al., 2011).
What are key papers?
Foundational: Łączkowski et al. (2011, 54 citations) on C-O insertion; Li et al. (2014, 44 citations) on double bond variants. Recent: Werz/Biju (2019, 276 citations); He et al. (2020, 124 citations).
What open problems exist?
Challenges include P/Se substrate scope and unified mechanisms; three-component couplings show promise but lack generality (García-López et al., 2015).
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Part of the Cyclization and Aryne Chemistry Research Guide