Subtopic Deep Dive
Gold-Catalyzed Hydroamination of Alkynes
Research Guide
What is Gold-Catalyzed Hydroamination of Alkynes?
Gold-Catalyzed Hydroamination of Alkynes is the nucleophilic addition of amines to alkynes promoted by gold catalysts, producing enamines and nitrogen heterocycles with high regioselectivity.
This reaction leverages gold(I) complexes as π-acid activators of alkynes, enabling anti-Markovnikov addition of amines. Key studies report broad substrate scope including terminal alkynes and anilines, yielding indole precursors (Huang et al., 2011, 179 citations; Obradors and Echavarren, 2013, 321 citations). Over 20 papers detail mechanistic insights and synthetic applications since 2011.
Why It Matters
Hydroamination provides direct C-N bond formation for nitrogen heterocycles in pharmaceuticals and natural products, bypassing multi-step reductions. Gold catalysis achieves mild conditions and atom economy for alkaloid synthesis (Huang et al., 2011). Applications include scalable routes to bioactive indoles, as reviewed in alkyne-nitrogen couplings (Neto and Zeni, 2019, 185 citations).
Key Research Challenges
Regioselectivity Control
Achieving anti-Markovnikov selectivity with internal alkynes remains difficult due to competing pathways. Gold ligands influence nucleophilic attack direction (Wang et al., 2014, 150 citations). Steric and electronic tuning is required for diverse amines.
Catalyst Deactivation
Gold(I) aggregates or over-reduction limit turnover numbers in hydroamination. Oxidative addition challenges persist with aryl halides (Zeineddine et al., 2017, 308 citations). Stabilizing Au(I)/Au(III) cycles addresses this.
Mechanistic Complexity
Multiple pathways including π-activation and carbene intermediates complicate prediction. Reviews highlight labyrinthine gold catalysis mechanisms (Obradors and Echavarren, 2013, 321 citations). Computational validation is needed.
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,...
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...
Rational development of catalytic Au(I)/Au(III) arylation involving mild oxidative addition of aryl halides
Abdallah Zeineddine, Laura Estévez, Sonia Mallet‐Ladeira et al. · 2017 · Nature Communications · 308 citations
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.
Recent advances in the gold-catalyzed additions to C–C multiple bonds
He Huang, Yu Zhou, Hong Liu · 2011 · Beilstein Journal of Organic Chemistry · 179 citations
C–O, C–N and C–C bonds are the most widespread types of bonds in nature, and are the cornerstone of most organic compounds, ranging from pharmaceuticals and agrochemicals to advanced materials and ...
Titanium-Catalyzed Multicomponent Couplings: Efficient One-Pot Syntheses of Nitrogen Heterocycles
Aaron L. Odom, Tanner J. McDaniel · 2015 · Accounts of Chemical Research · 157 citations
Nitrogen-based heterocycles are important frameworks for pharmaceuticals, natural products, organic dyes for solar cells, and many other applications. Catalysis for the formation of heterocyclic sc...
A general ligand design for gold catalysis allowing ligand-directed anti-nucleophilic attack of alkynes
Yanzhao Wang, Zhixun Wang, Yuxue Li et al. · 2014 · Nature Communications · 150 citations
Reading Guide
Foundational Papers
Start with Zhang (2014, 668 citations) for gold catalysis overview and alkyne oxidation context; then Huang et al. (2011, 179 citations) for hydroamination specifics; Obradors and Echavarren (2013, 321 citations) for mechanisms.
Recent Advances
Study Wang et al. (2014, 150 citations) for ligand design in nucleophilic attack; Neto and Zeni (2019, 185 citations) for indole applications.
Core Methods
Core techniques: Au(I) π-acid catalysis with JohnPhosAu or IPrAu complexes; ligand-directed regioselectivity; tandem hydroamination/cyclizations (Zhang, 2014; Wang et al., 2014).
How PapersFlow Helps You Research Gold-Catalyzed Hydroamination of Alkynes
Discover & Search
Research Agent uses searchPapers with 'gold-catalyzed hydroamination alkynes' to retrieve Huang et al. (2011) and 50+ related papers; citationGraph maps connections from Liming Zhang (2014, 668 citations) to indole synthesis works; findSimilarPapers expands to Neto and Zeni (2019); exaSearch uncovers obscure mechanistic studies.
Analyze & Verify
Analysis Agent employs readPaperContent on Obradors and Echavarren (2013) for mechanistic proposals, verifyResponse with CoVe chain-of-verification to cross-check regioselectivity claims across 10 papers, runPythonAnalysis to plot yield data from tables using pandas, and GRADE grading to score evidence strength on ligand effects.
Synthesize & Write
Synthesis Agent detects gaps in regioselectivity for disubstituted alkynes via contradiction flagging; Writing Agent uses latexEditText for reaction schemes, latexSyncCitations to integrate Zhang (2014), latexCompile for publication-ready manuscripts, and exportMermaid for catalytic cycle diagrams.
Use Cases
"Analyze yield trends in gold hydroamination from 2010-2020 papers using Python."
Research Agent → searchPapers → Analysis Agent → runPythonAnalysis (pandas data extraction, matplotlib yield plots) → researcher gets CSV of optimized conditions and statistical correlations.
"Draft a review section on gold hydroamination mechanisms with citations."
Synthesis Agent → gap detection → Writing Agent → latexEditText + latexSyncCitations (Obradors 2013, Wang 2014) + latexCompile → researcher gets compiled LaTeX PDF with formatted schemes.
"Find GitHub repos with gold catalysis simulation code from recent papers."
Research Agent → paperExtractUrls (Zeineddine 2017) → Code Discovery → paperFindGithubRepo → githubRepoInspect → researcher gets verified DFT codes for mechanistic modeling.
Automated Workflows
Deep Research workflow scans 50+ papers on gold alkyne activation, producing structured report with Huang (2011) timelines and citation networks. DeepScan applies 7-step analysis to Zhang (2014), verifying carbene mechanisms with CoVe checkpoints. Theorizer generates hypotheses on ligand-directed hydroamination from Obradors (2013) proposals.
Frequently Asked Questions
What defines gold-catalyzed hydroamination of alkynes?
It is the gold-promoted addition of amines to alkynes forming enamines or heterocycles, typically via π-activation of the triple bond (Huang et al., 2011).
What are common methods in this subtopic?
Methods use cationic Au(I) with phosphine or NHC ligands, often in tandem with indole formation; anti-nucleophilic attack is ligand-directed (Wang et al., 2014).
What are key papers?
Foundational: Zhang (2014, 668 citations) on gold catalysis evolution; Huang et al. (2011, 179 citations) on C-N additions; recent: Neto and Zeni (2019, 185 citations) on indole synthesis.
What open problems exist?
Challenges include enantioselective variants, catalyst recycling, and scope for internal alkynes without protodeauration (Obradors and Echavarren, 2013).
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Part of the Catalytic Alkyne Reactions Research Guide