Subtopic Deep Dive
Sonogashira Coupling
Research Guide
What is Sonogashira Coupling?
Sonogashira coupling is a palladium-catalyzed cross-coupling reaction between terminal alkynes and aryl or alkenyl halides to form carbon-carbon bonds, typically requiring a copper co-catalyst.
First reported in 1975, the reaction constructs conjugated enynes essential for pharmaceuticals and materials. Over 10,000 papers cite its applications, with recent advances focusing on copper-free variants and green conditions (Gadge and Bhanage, 2013). Ligand modifications and alternative solvents improve efficiency and sustainability.
Why It Matters
Sonogashira coupling enables synthesis of conjugated systems in drugs like antitumor agents and OLED materials. In pharmaceuticals, it constructs enyne motifs for bioactive compounds (Bryan et al., 2018). Green chemistry variants reduce waste, aligning with sustainable manufacturing (Rogge et al., 2017). Materials scientists use it for π-conjugated polymers in electronics.
Key Research Challenges
Copper-free catalysis
Traditional Sonogashira requires CuI, causing homocoupling of alkynes. Developing Pd-only systems maintains yields under mild conditions. Metallodendritic Pd catalysts offer recyclable alternatives (Astruc et al., 2005).
Green reaction media
Organic solvents generate waste; water or deep eutectic solvents are sought. Pd/bipyridyl systems enable aqueous reactions (Huang et al., 2010). Pharmaceutical manufacturers prioritize low-E factor conditions (Bryan et al., 2018).
Ligand and base optimization
Bulky phosphines reduce Pd aggregation but increase costs. Nitrogen ligands enable milder bases. Recent Pd systems for C-S coupling suggest transferable strategies (Li et al., 2020).
Essential Papers
Metal–organic and covalent organic frameworks as single-site catalysts
Sven M. J. Rogge, Anastasiya Bavykina, Julianna Hajek et al. · 2017 · Chemical Society Reviews · 1.0K citations
The potential of metal–organic frameworks (MOFs) and covalent organic frameworks (COFs) as platforms for the development of heterogeneous single-site catalysts is reviewed thoroughly.
Key Green Chemistry research areas from a pharmaceutical manufacturers’ perspective revisited
Marian C. Bryan, Peter J. Dunn, David A. Entwistle et al. · 2018 · Green Chemistry · 578 citations
The ACS Green Chemistry Institute® Pharmaceutical Roundtable has assembled an updated list of key research areas to highlight transformations and reaction media where more sustainable technologies ...
Green chemistry and catalysis
· 2007 · Choice Reviews Online · 431 citations
Preface. Foreword. 1 Introduction: Green Chemistry and Catalysis. 1.1 Introduction. 1.2. E Factors and Atom Efficiency. 1.3 The Role of Catalysis. 1.4 The Development of Organic Synthesis. 1.5 Cata...
Recent developments in palladium catalysed carbonylation reactions
Sandip T. Gadge, Bhalchandra M. Bhanage · 2013 · RSC Advances · 318 citations
Recently, carbonylation reactions have gained considerable interest as they are becoming a versatile tool in the synthesis of pharmaceuticals, agrochemicals and their intermediates. Nowadays, a ple...
Synthesis and applications of sodium sulfinates (RSO<sub>2</sub>Na): a powerful building block for the synthesis of organosulfur compounds
Raju Jannapu Reddy, Arram Haritha Kumari · 2021 · RSC Advances · 181 citations
This review provides a unique and comprehensive overview of sodium sulfinates for synthesizing many valuable sulfur-containing compounds, such as thiosulfonates, sulfonamides, sulfides, sulfones, a...
Organocatalysis: A Brief Overview on Its Evolution and Applications
Vanessa da Gama Oliveira, Mariana Cardoso, Luana da Silva Magalhães Forezi · 2018 · Catalysts · 145 citations
The use of small organic molecules as catalysts has gained increasing importance recently. These substances, the so-called organocatalysts, present a lot of advantages, like being less toxic, less ...
Metal-mediated synthesis of furans and pyrroles
Nitin T. Patil, Yoshinori Yamamoto · 2007 · ARKIVOC · 143 citations
The transition metal catalyzed synthesis of furans and pyrroles is becoming an important and highly rewarding protocol in organic synthesis.This review focuses on the use of transition metal as a c...
Reading Guide
Foundational Papers
Start with Gadge and Bhanage (2013, 318 cites) for Pd coupling context; Huang et al. (2010, 56 cites) for aqueous systems; Astruc et al. (2005) for recoverable catalysts. These cover mechanism, conditions, and green aspects.
Recent Advances
Rogge et al. (2017, 1023 cites) on MOF catalysts; Cicco et al. (2021, 124 cites) on deep eutectic solvents; Li et al. (2020) on related Pd C-S methods transferable to C-C.
Core Methods
Pd(0)/Pd(II) cycle with oxidative addition, alkyne coordination, reductive elimination. Ligands: PPh3, bipyridyls, NHCs. Bases: Et3N, inorganic carbonates. Solvents: THF, water, DES.
How PapersFlow Helps You Research Sonogashira Coupling
Discover & Search
Research Agent uses searchPapers('Sonogashira copper-free') to find 500+ papers, then citationGraph on Gadge and Bhanage (2013) reveals 318 downstream works on Pd-catalyzed couplings. findSimilarPapers expands to green variants; exaSearch queries 'Sonogashira deep eutectic solvents' surfaces Cicco et al. (2021).
Analyze & Verify
Analysis Agent runs readPaperContent on Rogge et al. (2017) to extract MOF catalyst yields for Sonogashira, then verifyResponse with CoVe cross-checks claims against 10 similar papers. runPythonAnalysis parses reaction yields from supplementary tables using pandas, with GRADE scoring evidence strength for 90%+ success rates.
Synthesize & Write
Synthesis Agent detects gaps like 'scalable copper-free Sonogashira >100g' across 50 papers, flags contradictions in base effects. Writing Agent uses latexEditText for reaction schemes, latexSyncCitations for 20 refs, latexCompile to PDF, and exportMermaid for mechanistic flowcharts.
Use Cases
"Extract Sonogashira yield data from 20 recent papers and plot vs temperature"
Research Agent → searchPapers → Analysis Agent → readPaperContent (10 papers) → runPythonAnalysis (pandas scrape yields, matplotlib regression plot) → researcher gets CSV + yield-temperature scatterplot.
"Write LaTeX review section on green Sonogashira with 15 citations"
Synthesis Agent → gap detection → Writing Agent → latexEditText (draft text) → latexSyncCitations (Bryan 2018 et al.) → latexCompile → researcher gets camera-ready PDF section.
"Find GitHub repos with Sonogashira optimization code"
Research Agent → searchPapers('Sonogashira') → Code Discovery → paperExtractUrls → paperFindGithubRepo → githubRepoInspect → researcher gets 5 repos with DFT models and yield predictors.
Automated Workflows
Deep Research scans 50+ Sonogashira papers via searchPapers → citationGraph → structured report with yield meta-analysis. DeepScan applies 7-step verification: readPaperContent → CoVe → runPythonAnalysis on Rogge (2017) MOF data. Theorizer generates hypotheses like 'bipyridyl ligands outperform phosphines in water' from Huang (2010) patterns.
Frequently Asked Questions
What defines Sonogashira coupling?
Palladium-catalyzed coupling of terminal alkyne R-C≡C-H with aryl/alkenyl-X (X= I, Br) using CuI and base to give R-C≡C-Ar. Typical conditions: Pd(PPh3)4, CuI, Et3N, THF, 60°C.
What are key methods for copper-free Sonogashira?
Pd(NH3)2Cl2 with cationic bipyridyl in water (Huang et al., 2010). Metallodendritic Pd catalysts recyclable by precipitation (Astruc et al., 2005). MOF single-site catalysts (Rogge et al., 2017).
What are seminal papers?
Gadge and Bhanage (2013, 318 cites) on Pd carbonylations including couplings. Patil and Yamamoto (2007, 143 cites) on metal-mediated heterocycles via Sonogashira. Astruc et al. (2005, 112 cites) on dendritic Pd.
What open problems exist?
Scalable >100g copper-free variants without ligand overload. Room-temperature activation of aryl chlorides. Integration with flow chemistry for pharmaceuticals (Bryan et al., 2018).
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Part of the Chemical Synthesis and Reactions Research Guide