Subtopic Deep Dive
Transition Metal-Catalyzed Asymmetric Allylic Alkylation
Research Guide
What is Transition Metal-Catalyzed Asymmetric Allylic Alkylation?
Transition Metal-Catalyzed Asymmetric Allylic Alkylation uses chiral Pd, Ir, or Rh complexes to enable regioselective allylic substitutions forming C-C or C-N bonds with high enantioselectivity.
This method relies on ligands to control regiochemistry and predict absolute configuration in allylic substitutions. Key advances include Pd-catalyzed ionizations (Trost et al., 1992, 527 citations) and chiral counteranion strategies (Mukherjee and List, 2007, 608 citations). Over 10 highly cited papers since 1992 document its scope.
Why It Matters
This reaction constructs all-carbon quaternary stereocenters vital for natural product synthesis, as shown in total syntheses reviewed by Hong and Stoltz (2013, 350 citations). Trost (2002, 316 citations) highlights its role as a Pd asymmetric allylic alkylation (AAA) tool for pharmaceuticals. You et al. (2014, 810 citations; 2016, 742 citations) extend it to dearomatization, enabling 3D structures from planar aromatics used in bioactive molecules (Liu et al., 2015, 800 citations).
Key Research Challenges
Regioselectivity Control
Achieving branched over linear products requires precise ligand design, as early Pd systems showed mixed regiochemistry (Trost et al., 1992, 527 citations). Ir catalysts improve selectivity but demand substrate tuning (You et al., 2014, 810 citations).
Quaternary Center Formation
Creating all-carbon quaternary stereocenters from α-branched aldehydes challenges enantiocontrol, addressed by Pd/chiral acid catalysis (Mukherjee and List, 2007, 608 citations). Scalability limits total synthesis applications (Hong and Stoltz, 2013, 350 citations).
Ligand Optimization
Modular ligand design via enantioselective ionizations remains key, but predicting configuration across substrates persists (Trost et al., 1992, 527 citations). Dearomatization variants need heterocycle-compatible ligands (You et al., 2016, 742 citations).
Essential Papers
Transition-Metal-Catalyzed Asymmetric Allylic Dearomatization Reactions
Chun‐Xiang Zhuo, Chao Zheng, Shu‐Li You · 2014 · Accounts of Chemical Research · 810 citations
Dearomatization reactions serve as powerful methods for the synthesis of highly functionalized, three-dimensional structures starting with simple planar aromatic compounds. Among processes of this ...
Catalytic Enantioselective Construction of Quaternary Stereocenters: Assembly of Key Building Blocks for the Synthesis of Biologically Active Molecules
Yiyang Liu, Seo‐Jung Han, Wenbo Liu et al. · 2015 · Accounts of Chemical Research · 800 citations
The ever-present demand for drugs with better efficacy and fewer side effects continually motivates scientists to explore the vast chemical space. Traditionally, medicinal chemists have focused muc...
Catalytic asymmetric dearomatization (CADA) reactions of phenol and aniline derivatives
Wenting Wu, Liming Zhang, Shu‐Li You · 2016 · Chemical Society Reviews · 742 citations
In this tutorial review, an up to date summary of recent progress in catalytic asymmetric dearomatization (CADA) reactions of phenol and aniline derivatives is presented.
Chiral Counteranions in Asymmetric Transition-Metal Catalysis: Highly Enantioselective Pd/Brønsted Acid-Catalyzed Direct α-Allylation of Aldehydes
Santanu Mukherjee, Benjamin List · 2007 · Journal of the American Chemical Society · 608 citations
We have developed a highly enantioselective Pd/chiral acid-catalyzed α-allylation of α-branched aldehydes with an allyl amine as the allylating species that creates all-carbon quaternary stereogeni...
Diastereoselective Allylation of Carbonyl Compounds and Imines: Application to the Synthesis of Natural Products
Miguel Yus, José C. González‐Gómez, Francisco Foubelo · 2013 · Chemical Reviews · 584 citations
We thank the Spanish Ministerio de Ciencia e Innovación (Grant Nos. CTQ2007-65218 and Consolider Ingenio 2010-CSD-2007-00006 and CTQ2011-24165), the Generalitat Valenciana (Grant No. PROMETEO/2009...
A modular approach for ligand design for asymmetric allylic alkylations via enantioselective palladium-catalyzed ionizations
Barry M. Trost, David L. Van Vranken, Carsten Bingel · 1992 · Journal of the American Chemical Society · 527 citations
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA modular approach for ligand design for asymmetric allylic alkylations via enantioselective palladium-catalyzed ionizationsBarry M. Trost, David L. Van ...
Quaternary Stereocenters
· 2005 · 407 citations
Foreward. Preface. List of Contributors. Symbols and Abbreviations. 1 Important Natural Products (Hirokazu Arimoto and Daisuke Uemura). 1.1 Introduction. 1.2 Alkylation of Tertiary Carbon Centers. ...
Reading Guide
Foundational Papers
Start with Trost et al. (1992, 527 citations) for ligand design principles; Mukherjee and List (2007, 608 citations) for counteranion strategy; You et al. (2014, 810 citations) for dearomatization entry.
Recent Advances
Study Liu et al. (2015, 800 citations) for quaternary applications; You et al. (2016, 742 citations) for phenol/aniline CADA; Hong and Stoltz (2013, 350 citations) for total synthesis uses.
Core Methods
Core techniques: Pd π-allyl ionization with chiral phosphines; Brønsted acid counteranions; Ir-catalyzed branched-selective alkylations; dearomatizing cyclizations.
How PapersFlow Helps You Research Transition Metal-Catalyzed Asymmetric Allylic Alkylation
Discover & Search
Research Agent uses searchPapers and citationGraph to map Trost et al. (1992, 527 citations) as foundational, linking to 800+ citing works like Liu et al. (2015). exaSearch finds recent dearomatization extensions; findSimilarPapers clusters You (2014, 810 citations) with related CADA reactions.
Analyze & Verify
Analysis Agent applies readPaperContent to extract ee values and yields from Mukherjee and List (2007), then runPythonAnalysis plots regioselectivity trends across 10 papers using pandas. verifyResponse with CoVe and GRADE grading confirms enantioselectivity claims against raw data.
Synthesize & Write
Synthesis Agent detects gaps in Ir vs Pd regiochemistry; Writing Agent uses latexEditText, latexSyncCitations for Trost (2002), and latexCompile to generate reaction scheme manuscripts. exportMermaid visualizes allylic ionization mechanisms from literature.
Use Cases
"Plot enantioselectivity vs ligand type in Pd AAA reactions from top 20 papers"
Research Agent → searchPapers → Analysis Agent → runPythonAnalysis (pandas/matplotlib scatterplot) → researcher gets CSV of ee/yield data with publication trends.
"Draft LaTeX review section on Trost AAA with citations and allylation scheme"
Research Agent → citationGraph (Trost 1992/2002) → Synthesis Agent (gap detection) → Writing Agent → latexEditText + latexSyncCitations + latexCompile → researcher gets compiled PDF section.
"Find GitHub repos implementing computational prediction of AAA stereochemistry"
Research Agent → paperExtractUrls (You 2014) → Code Discovery → paperFindGithubRepo + githubRepoInspect → researcher gets verified code for configuration modeling.
Automated Workflows
Deep Research workflow scans 50+ AAA papers via citationGraph from Trost (1992), delivering structured reports on ligand evolution. DeepScan's 7-step chain verifies regioselectivity claims in You (2016) with CoVe checkpoints and Python ee analysis. Theorizer generates hypotheses on Ir/Pd crossover from Stoltz (2015) literature patterns.
Frequently Asked Questions
What defines Transition Metal-Catalyzed Asymmetric Allylic Alkylation?
It employs chiral Pd, Ir, Rh complexes for enantioselective allylic substitutions forming C-C/N bonds with regiocontrol (Trost et al., 1992; You et al., 2014).
What are key methods?
Pd-catalyzed ionizations with modular ligands (Trost et al., 1992, 527 citations); chiral counteranion α-allylation (Mukherjee and List, 2007, 608 citations); dearomatization variants (You et al., 2014, 810 citations).
What are landmark papers?
Trost et al. (1992, 527 citations) on ligand design; Mukherjee and List (2007, 608 citations) on quaternary centers; You et al. (2014, 810 citations) on dearomatization.
What open problems exist?
Broadening substrate scope for heterocycles; improving scalability for quaternary centers; predicting configurations without empiricism (Hong and Stoltz, 2013; Liu et al., 2015).
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