Subtopic Deep Dive
Total Synthesis of Butenolides and Furanones
Research Guide
What is Total Synthesis of Butenolides and Furanones?
Total synthesis of butenolides and furanones involves stereoselective construction of α-methylene-butenolide and furanone scaffolds found in marine natural products with antibiotic and cytotoxic activities.
Researchers develop asymmetric aldol condensations, radical cyclizations, and cross-coupling strategies for these heterocycles. Over 40 papers detail routes to pharmacophores in compounds like neopeltolide and rubrolides. Key methods include dianion aldol reactions (Huckin and Weiler, 1974, 69 citations) and silylfuran condensations (Teixeira et al., 2007, 43 citations).
Why It Matters
Butenolide and furanone cores appear in marine macrolides like neopeltolide, enabling structural revisions and bioactivity studies (Custar et al., 2007, 138 citations). Cytotoxic furan-2(5H)-ones target cancer via arylidene derivatives (Teixeira et al., 2007). Rubrolides from fungi show antibiotic potential (Zhu et al., 2013, 67 citations), supporting drug discovery from natural scaffolds.
Key Research Challenges
Stereocontrol in Cyclizations
Achieving diastereoselectivity in macrocycle formation challenges total syntheses like neopeltolide (Custar et al., 2007). Lewis acid-catalyzed steps require precise substrate control. Alternative radical methods remain underdeveloped for complex furanones.
Scalable Dianion Aldol Routes
β-Keto ester dianions form δ-hydroxy esters but yield varies with electrophiles (Huckin and Weiler, 1974). Dehydration to unsaturated precursors limits annelation efficiency. Optimization for natural product scales persists as an issue.
Functional Group Compatibility
Cross-couplings like Stille in hamabiwalactone synthesis tolerate stannylfuranones but sensitive halides (Richecœur and Sweeney, 2000). Trichloromethyl handling in barbamide adds complexity (Nguyen et al., 2001). Selective protection strategies hinder multi-step sequences.
Essential Papers
Total Synthesis and Structural Revision of the Marine Macrolide Neopeltolide
Daniel Custar, T. P. Zabawa, Karl A. Scheidt · 2007 · Journal of the American Chemical Society · 138 citations
The total synthesis and structural revision of the marine natural product neopeltolide is reported. The key bond-forming step involves a Lewis acid-catalyzed intramolecular cyclization to install t...
Aldol Type Condensations of β-Keto Ester Dianions
Stuart N. Huckin, Larry Weiler · 1974 · Canadian Journal of Chemistry · 69 citations
The dianion of methyl acetoacetate reacts with ketones and aldehydes to yield δ -hydroxy-β-keto esters. These hydroxy esters can be dehydrated to the corresponding γ,δ-unsaturated-β-keto esters whi...
New rubrolides from the marine-derived fungus Aspergillus terreus OUCMDZ-1925
Tonghan Zhu, Zhengqian Chen, Peipei Liu et al. · 2013 · The Journal of Antibiotics · 67 citations
Molecular structure and vibrational spectra of 2(5H)-furanone and 2(5H)-thiophenone isolated in low temperature inert matrix
S. Breda, Igor Reva, Rui Fausto · 2008 · Journal of Molecular Structure · 52 citations
Synthesis and Cytotoxic Activity of Some 3-Benzyl-5-Arylidenefuran-2(5H)-ones
Róbson Ricardo Teixeira, Luiz C. A. Barbosa, Célia R. A. Maltha et al. · 2007 · Molecules · 43 citations
3-Benzyl-furan-2(5H)-one (2a) and 3-(4-bromobenzyl)-furan-2(5H)-one (2b) were treated with TBDMSOTf and converted into the corresponding tert-butyldimethyl-silylfuran ethers. These furans were furt...
The Furan-2(5H)-ones: Recent Synthetic Methodologies and its Application in Total Synthesis of Natural Products
M.V.N. De Souza · 2005 · Mini-Reviews in Organic Chemistry · 41 citations
In recent years, furan-2(5H)-ones have attracted considerable attention as synthetic target. This subunit is present in a large number of natural products, which display a wide range of biological ...
Synthesis of 3(2<i>H</i>)‐Furanones: A Review
Vishnu K. Omanakuttan, Jubi John, Henning Hopf · 2020 · European Journal of Organic Chemistry · 32 citations
The present review describes the methods reported for the synthesis of 3(2 H )‐furanones. This heterocycle forms the core structure of a number of natural products and biologically active scaffolds...
Reading Guide
Foundational Papers
Start with Custar et al. (2007, 138 citations) for macrolide cyclization strategy and Huckin and Weiler (1974, 69 citations) for dianion aldol fundamentals enabling furanone annelations.
Recent Advances
Omanakuttan et al. (2020, 32 citations) reviews 3(2H)-furanone methods; Zhu et al. (2013, 67 citations) isolates rubrolides guiding synthesis targets.
Core Methods
Core techniques: Lewis acid cyclizations (Custar et al., 2007), β-ketoester dianion aldols (Huckin and Weiler, 1974), silyl protections for condensations (Teixeira et al., 2007), and stannane couplings (Richecœur and Sweeney, 2000).
How PapersFlow Helps You Research Total Synthesis of Butenolides and Furanones
Discover & Search
Research Agent uses searchPapers to query 'total synthesis butenolides furanones stereoselective' retrieving Custar et al. (2007, 138 citations), then citationGraph maps 50+ related works on aldol cyclizations, and findSimilarPapers expands to rubrolide syntheses from Zhu et al. (2013). exaSearch uncovers obscure marine natural product routes.
Analyze & Verify
Analysis Agent applies readPaperContent to parse Custar et al. (2007) cyclization yields, verifies stereochemistry claims via verifyResponse (CoVe) against Huckin and Weiler (1974) dianion data, and runs PythonAnalysis to plot reaction efficiencies from extracted tables using pandas, with GRADE scoring evidence strength.
Synthesize & Write
Synthesis Agent detects gaps in scalable furanone routes post-2015 via contradiction flagging across Teixeira et al. (2007) and De Souza (2005); Writing Agent uses latexEditText for scheme revisions, latexSyncCitations to bibtex neopeltolide papers, latexCompile for full manuscripts, and exportMermaid diagrams aldol pathways.
Use Cases
"Extract stereoselectivity data from neopeltolide synthesis papers and analyze ee values."
Research Agent → searchPapers('neopeltolide total synthesis') → Analysis Agent → readPaperContent(Custar 2007) → runPythonAnalysis(pandas df of ee/yields, matplotlib plot) → researcher gets CSV of verified stereodata with GRADE scores.
"Draft LaTeX reaction scheme for furan-2(5H)-one aldol condensation."
Synthesis Agent → gap detection(aldol routes) → Writing Agent → latexGenerateFigure(aldol scheme) → latexSyncCitations(Huckin 1974, Teixeira 2007) → latexCompile → researcher gets compiled PDF with synced references.
"Find GitHub repos with code for butenolide synthesis simulations."
Research Agent → searchPapers('butenolide synthesis computational') → Code Discovery → paperExtractUrls → paperFindGithubRepo → githubRepoInspect → researcher gets forked DFT optimization scripts for furanone geometries.
Automated Workflows
Deep Research workflow scans 50+ papers via searchPapers on 'furanone total synthesis', structures reports with citationGraph clustering aldol vs. coupling methods, outputs neopeltolide-focused review. DeepScan applies 7-step CoVe to verify Custar et al. (2007) revision against Zhu et al. (2013) rubrolides. Theorizer generates hypotheses for radical cyclization gaps from Huckin and Weiler (1974) dianions.
Frequently Asked Questions
What defines butenolide and furanone total synthesis?
Stereoselective routes construct α-methylene-butenolide and furan-2(5H)-one rings as pharmacophores in cytotoxins and antibiotics. Examples include macrocycle cyclizations (Custar et al., 2007).
What are main synthetic methods?
Dianion aldol condensations (Huckin and Weiler, 1974), silylfuran aldehyde condensations (Teixeira et al., 2007), and Stille couplings (Richecœur and Sweeney, 2000) build these scaffolds.
Which are key papers?
Custar et al. (2007, 138 citations) revises neopeltolide; De Souza (2005, 41 citations) reviews furan-2(5H)-ones; Omanakuttan et al. (2020, 32 citations) covers 3(2H)-furanones.
What open problems exist?
Scalable stereocontrol in multi-step sequences and functional group tolerance in couplings remain unsolved, as seen in barbamide (Nguyen et al., 2001) and hamabiwalactone (Richecœur and Sweeney, 2000).
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