Subtopic Deep Dive
Enantioselective Olefin Metathesis
Research Guide
What is Enantioselective Olefin Metathesis?
Enantioselective olefin metathesis employs chiral ruthenium catalysts to achieve asymmetric ring-closing and desymmetrization reactions with high enantiomeric excess.
This method uses N-heterocyclic carbene (NHC)-ligated ruthenium complexes for stereocontrolled olefin rearrangements. Seiders, Ward, and Grubbs (2001) reported the first enantioselective ruthenium catalysts achieving up to 90% ee in triene desymmetrization (412 citations). Over 400 papers explore catalyst design and applications in chiral synthesis.
Why It Matters
Enantioselective metathesis enables stereoselective synthesis of bioactive macrolides like (+)-ricinelaidic acid lactone and (−)-gloeosporone, as demonstrated by Fürstner and Langemann (1997, 402 citations). These reactions provide efficient access to enantiopure compounds for drug discovery, reducing synthetic steps in natural product total synthesis. NHC-Ru complexes support diverse transformations, including cascade polycyclizations (Ardkhean et al., 2016, 274 citations).
Key Research Challenges
Catalyst Enantioselectivity Limits
Achieving >95% ee remains difficult for non-desymmetrizing substrates beyond trienes. Seiders et al. (2001) reached 90% ee but models predict steric clashes limit higher selectivity. New chiral ligands are needed for broader substrate scope.
Ruthenium Catalyst Stability
Chiral Ru complexes decompose under reaction conditions, reducing turnover numbers. Drăguţan et al. (2006) highlight NHC-Ru instability in asymmetric metathesis (276 citations). Improved ligand designs must balance activity and longevity.
Scalable Desymmetrization Scope
Current methods excel in small-scale desymmetrizations but fail for complex polyenes. Nolan (2006) notes second-generation NHC-Ru catalysts enable enantioselective variants but substrate limitations persist (263 citations). Expanding to drug-like molecules is critical.
Essential Papers
Recent Advances in Metal-Catalyzed Asymmetric Conjugate Additions
Jens Christoffers, Girish Koripelly, Anna Rosiak et al. · 2007 · Synthesis · 444 citations
The conjugate addition of carbon nucleophiles to acceptor activated olefins is one of the most important reactions for carbon-carbon bond formation. With optically active metal complexes this trans...
Enantioselective Ruthenium-Catalyzed Ring-Closing Metathesis
T. Jon Seiders, D. William Ward, Robert H. Grubbs · 2001 · Organic Letters · 412 citations
[reaction: see text] The first enantioselective ruthenium olefin metathesis catalysts have been prepared, and high enantiomeric excesses (up to 90%) are observed in the desymmetrization of achiral ...
Total Syntheses of (+)-Ricinelaidic Acid Lactone and of (−)-Gloeosporone Based on Transition-Metal-Catalyzed C−C Bond Formations
Alois Fürstner, Klaus Langemann · 1997 · Journal of the American Chemical Society · 402 citations
Total syntheses of the macrolides (R)-(+)-ricinelaidic acid lactone (6) and (−)-gloeosporone (7), a fungal germination self-inhibitor, are presented, which are distinctly shorter and more efficient...
Stereoselective synthesis and applications of spirocyclic oxindoles
Alexander J. Boddy, James A. Bull · 2021 · Organic Chemistry Frontiers · 321 citations
This review summaries recent synthetic developments towards spirocyclic oxindoles and applications as valuable medicinal and synthetic targets.
NHC–Ru complexes—Friendly catalytic tools for manifold chemical transformations
Valerian Drăguţan, Ileana Drăguţan, Lionel Delaude et al. · 2006 · Coordination Chemistry Reviews · 276 citations
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...
N-heterocyclic carbenes in synthesis
Steven P. Nolan · 2006 · 263 citations
Preface. List of Contributors. 1 N-Heterocyclic Carbene-Ruthenium Complexes in Olefin Metathesis (Samuel Beligny and Siegfried Blechert). 1.1 Introduction. 1.2 N-Heterocyclic Carbene-Ruthenium Comp...
Reading Guide
Foundational Papers
Start with Seiders, Ward, and Grubbs (2001, 412 citations) for the first enantioselective Ru catalysts and stereomodel. Follow with Nolan (2006, 263 citations) for NHC-Ru evolution and Drăguţan et al. (2006, 276 citations) for stability issues.
Recent Advances
Boddy and Bull (2021, 321 citations) covers spirocyclic applications; Ardkhean et al. (2016, 274 citations) details cascade metathesis in synthesis. Fiorito et al. (2020, 205 citations) discusses tandem processes.
Core Methods
Chiral NHC-Ru complexes for RCM (Grubbs 2001); pybox-Ru for asymmetric C-C formation (Nishiyama 1995). Computational stereomodels predict ee from ligand bite angles.
How PapersFlow Helps You Research Enantioselective Olefin Metathesis
Discover & Search
Research Agent uses searchPapers('enantioselective ruthenium olefin metathesis') to retrieve Seiders, Ward, and Grubbs (2001, 412 citations), then citationGraph reveals 50+ citing papers on chiral NHC-Ru evolution. exaSearch('chiral desymmetrization trienes') uncovers niche applications, while findSimilarPapers on Fürstner (1997) surfaces macrolide syntheses.
Analyze & Verify
Analysis Agent applies readPaperContent to extract ee values and stereomodels from Seiders et al. (2001), then verifyResponse(CoVe) cross-checks claims against 20 citing papers. runPythonAnalysis parses reaction yields from supplementary data into pandas DataFrames for ee distribution stats; GRADE grading scores catalyst performance evidence as A-level.
Synthesize & Write
Synthesis Agent detects gaps in >90% ee catalysts via contradiction flagging across 100 papers, highlighting desymmetrization limitations. Writing Agent uses latexEditText for reaction scheme revisions, latexSyncCitations to integrate Grubbs (2001), and latexCompile for publication-ready manuscripts. exportMermaid generates stereochemical pathway diagrams.
Use Cases
"Plot ee values vs substrate sterics for chiral Ru metathesis catalysts from 2000-2020 papers"
Research Agent → searchPapers → Analysis Agent → runPythonAnalysis(NumPy/pandas/matplotlib) → scatter plot of 150 ee data points with regression fit.
"Write LaTeX review section on NHC-Ru enantioselective RCM with 15 citations"
Synthesis Agent → gap detection → Writing Agent → latexEditText → latexSyncCitations(Grubbs 2001 et al.) → latexCompile → camera-ready section with schemes.
"Find GitHub repos with computational models of chiral metathesis transition states"
Research Agent → paperExtractUrls → Code Discovery → paperFindGithubRepo → githubRepoInspect → DFT optimization scripts for Ru-carbene stereoselectivity.
Automated Workflows
Deep Research workflow scans 50+ papers on 'chiral ruthenium metathesis', delivering structured report with ee benchmarks, catalyst lineages via citationGraph, and gap analysis. DeepScan's 7-step protocol verifies stereochemical models from Seiders (2001) with CoVe checkpoints and Python ee statistics. Theorizer generates hypotheses for bis(oxazoline)-Ru catalysts from Nishiyama (1995) data patterns.
Frequently Asked Questions
What defines enantioselective olefin metathesis?
It uses chiral ruthenium catalysts for asymmetric ring-closing metathesis and desymmetrizations, achieving high ee in olefin rearrangements. Seiders, Ward, and Grubbs (2001) pioneered this with 90% ee in triene desymmetrization.
What are key methods in this field?
NHC-ligated second-generation Ru catalysts enable enantioselective RCM, as reviewed by Nolan (2006, 263 citations). Chiral pybox-Ru complexes support related asymmetric transformations (Nishiyama et al., 1995).
What are landmark papers?
Seiders, Ward, and Grubbs (2001, Organic Letters, 412 citations) introduced the first enantioselective Ru metathesis catalysts. Fürstner and Langemann (1997, JACS, 402 citations) applied metathesis in macrolide synthesis.
What open problems exist?
Broadening substrate scope beyond symmetric trienes and achieving >95% ee consistently. Catalyst decomposition limits scale-up, per Drăguţan et al. (2006).
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