Subtopic Deep Dive
Enantioselective Gold-Catalyzed Alkyne Reactions
Research Guide
What is Enantioselective Gold-Catalyzed Alkyne Reactions?
Enantioselective gold-catalyzed alkyne reactions employ chiral gold complexes and ligands to induce asymmetry in cyclizations and additions to alkynes, yielding products with high enantiomeric excess.
This subtopic centers on developing chiral phosphine and N-heterocyclic carbene ligands for gold(I) catalysts to control stereochemistry in alkyne activations (Marinetti et al., 2012, 254 citations). Key transformations include enantioselective cycloisomerizations of polyynes and allenynes, producing chiral heterocycles (López and Mascareñas, 2011, 183 citations). Over 10 major reviews document progress since 2011, with Zhang's 2014 account (668 citations) highlighting alkyne oxidation pathways.
Why It Matters
Enantioselective gold catalysis enables synthesis of single-enantiomer pharmaceuticals, bypassing costly racemate resolutions used in >50% of drug production. Marinetti et al. (2012) detail applications in chiral cycloisomerizations for alkaloid precursors, achieving >95% ee in 1,3-diene formations. Zhang (2014) demonstrates α-oxo gold carbene generation from alkynes for asymmetric heterocycle assembly, impacting antiviral and anticancer agent synthesis. Obradors and Echavarren (2013) map mechanisms enabling scalable routes to enantiopure natural product scaffolds.
Key Research Challenges
Chiral Ligand Design
Developing ligands that impose high facial selectivity on π-activated gold-alkyne complexes remains difficult due to flexible coordination geometries. Marinetti et al. (2012) note phosphine ligands achieve 90% ee in cycloisomerizations but fail in oxidative variants. Zhang (2014) identifies need for ligands stable under alkyne oxidation conditions.
Mechanistic Opacity
Gold(I) catalysis involves ambiguous protodeauration and carbene pathways, complicating ee prediction. Obradors and Echavarren (2013) outline competing π- and σ-pathways in alkyne activation, validated by DFT but lacking stereochemical resolution. Ranieri et al. (2015) debunk myths on ligand effects, urging anion-controlled studies.
Substrate Scope Limits
Enantioselectivity drops with electron-poor alkynes or bulky substituents, restricting complex molecule synthesis. López and Mascareñas (2011) report [4+2] cycloadditions succeed only for 1,6-enynes with simple R groups. Hong and Ye (2020) highlight ynamide bias aiding regioselectivity but not broad asymmetry.
Essential Papers
A Non-Diazo Approach to α-Oxo Gold Carbenes via Gold-Catalyzed Alkyne Oxidation
Liming Zhang · 2014 · Accounts of Chemical Research · 668 citations
For the past dozen years, homogeneous gold catalysis has evolved from a little known topic in organic synthesis to a fully blown research field of significant importance to synthetic practitioners,...
Transition Metal-Catalyzed Tandem Reactions of Ynamides for Divergent N-Heterocycle Synthesis
Feng‐Lin Hong, Long‐Wu Ye · 2020 · Accounts of Chemical Research · 398 citations
ConspectusYnamides are electron-rich heteroatom-substituted alkynes with a C-C triple bond directly attached to the amide group. Importantly, this amide group is able to impose an electronic bias, ...
Intriguing mechanistic labyrinths in gold(<scp>i</scp>) catalysis
Carla Obradors, Antonio M. Echavarren · 2013 · Chemical Communications · 321 citations
Many mechanistically intriguing reactions have been developed in the last decade using gold(I) as catalyst. Here we review the main mechanistic proposals in gold-catalysed activation of alkynes and...
Cascade polycyclizations in natural product synthesis
Ruchuta Ardkhean, Dimitri F. J. Caputo, Sarah M. Morrow et al. · 2016 · Chemical Society Reviews · 274 citations
Cascade (domino) reactions have an unparalleled ability to generate molecular complexity from relatively simple starting materials; these transformations are particularly appealing when multiple ri...
Enantioselective, transition metal catalyzed cycloisomerizations
Angéla Marinetti, Hélène Jullien, Arnaud Voituriez · 2012 · Chemical Society Reviews · 254 citations
This review illustrates enantioselective transition-metal promoted skeletal rearrangements of polyunsaturated substrates possessing olefin, alkyne or allene functions. These processes are classifie...
Anatomy of gold catalysts: facts and myths
Beatrice Ranieri, Imma Escofet, Antonio M. Echavarren · 2015 · Organic & Biomolecular Chemistry · 213 citations
This review article covers the main types of gold(<sc>i</sc>) complexes used as precatalysts under homogeneous conditions in organic synthesis and discusses the different ways of catalyst activatio...
Recent advances in the synthesis of indoles from alkynes and nitrogen sources
José S. S. Neto, Gilson Zeni · 2019 · Organic Chemistry Frontiers · 185 citations
This review highlights ten years of success in the synthesis of indoles using alkynes and nitrogen sources as substrates.
Reading Guide
Foundational Papers
Start with Zhang (2014, 668 citations) for α-oxo gold carbene generation from alkynes; Marinetti et al. (2012, 254 citations) for enantioselective cycloisomerization survey; López and Mascareñas (2011, 183 citations) for cycloaddition mechanisms.
Recent Advances
Hong and Ye (2020, 398 citations) on ynamide heterocycle synthesis; Shen et al. (2017, 159 citations) on azido-diyne cyclizations; Neto and Zeni (2019, 185 citations) on indole formation.
Core Methods
π-Acid activation of alkynes by chiral (PR3)Au+ or NHC-Au+; nucleophilic additions yielding vinylgold intermediates; protodeauration with chiral anion control (Ranieri et al., 2015).
How PapersFlow Helps You Research Enantioselective Gold-Catalyzed Alkyne Reactions
Discover & Search
Research Agent uses searchPapers('enantioselective gold alkyne catalysis chiral ligands') to retrieve 50+ papers including Marinetti et al. (2012), then citationGraph reveals Echavarren's mechanistic cluster (321 citations), and findSimilarPapers expands to Zhang (2014) oxidation methods.
Analyze & Verify
Analysis Agent applies readPaperContent on López and Mascareñas (2011) to extract [2+2] cycloaddition ee data, verifies mechanistic claims via verifyResponse (CoVe) against Obradors and Echavarren (2013), and runPythonAnalysis plots ee vs. ligand bite angle from 10 papers using pandas, graded A by GRADE for statistical rigor.
Synthesize & Write
Synthesis Agent detects gaps in chiral ligand scope for oxidative alkynes (Zhang 2014), flags contradictions between protodeauration rates (Obradors 2013 vs. Ranieri 2015), then Writing Agent uses latexEditText for reaction schemes, latexSyncCitations for 20 refs, and latexCompile for publication-ready review.
Use Cases
"Extract ee values and plot vs temperature from gold-catalyzed enyne cycloisomerizations"
Research Agent → searchPapers → Analysis Agent → readPaperContent (Marinetti 2012) → runPythonAnalysis (pandas scatterplot) → matplotlib ee/temperature graph exported as PNG.
"Write LaTeX review section on chiral gold phosphine ligands for alkyne activation"
Synthesis Agent → gap detection (ligand stability) → Writing Agent → latexEditText (draft) → latexSyncCitations (Zhang 2014, López 2011) → latexCompile → PDF with schemes.
"Find open-source codes for DFT modeling of gold-alkyne π-complexes"
Research Agent → paperExtractUrls (Echavarren papers) → Code Discovery → paperFindGithubRepo → githubRepoInspect → Gaussian input files for stereoselectivity simulations.
Automated Workflows
Deep Research workflow scans 50+ papers via searchPapers on 'enantioselective gold alkyne', structures report with ee tables from Marinetti (2012) and mechanistic trees from Obradors (2013). DeepScan applies 7-step CoVe to verify Zhang (2014) oxidation claims against 20 citing papers. Theorizer generates hypotheses on bidentate ligand effects from citationGraph clusters.
Frequently Asked Questions
What defines enantioselective gold-catalyzed alkyne reactions?
Use of chiral gold(I) complexes with phosphine or NHC ligands to activate alkynes for asymmetric cyclizations, achieving >90% ee in heterocycle synthesis (Marinetti et al., 2012).
What are key methods?
Chiral ligand-controlled cycloisomerizations of enynes/allenes and alkyne oxidations to gold carbenes; examples include [4+2] cycloadditions (López and Mascareñas, 2011) and ynamide tandem reactions (Hong and Ye, 2020).
What are seminal papers?
Zhang (2014, 668 citations) on alkyne oxidation; Marinetti et al. (2012, 254 citations) on cycloisomerizations; Obradors and Echavarren (2013, 321 citations) on mechanisms.
What open problems exist?
Broadening substrate scope beyond electron-rich alkynes, resolving σ/π pathway stereodivergence, and designing ligands for >99% ee in oxidative couplings (Zhang 2014; Ranieri et al. 2015).
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Part of the Catalytic Alkyne Reactions Research Guide