Subtopic Deep Dive
Organocatalytic Atroposelective Reactions
Research Guide
What is Organocatalytic Atroposelective Reactions?
Organocatalytic atroposelective reactions use chiral organocatalysts like phosphoric acids and N-heterocyclic carbenes to forge C-C or C-H bonds forming axially chiral biaryls and heterobiaryls.
This subtopic covers metal-free asymmetric syntheses yielding enantioenriched atropisomers via cascade activations and annulations. Key methods include Brønsted acid catalysis for arylquinazolinones (Wang et al., 2017) and NHC-catalyzed [3+3] annulations (Zhao et al., 2018). Over 20 papers from 2016-2022 detail strategies, with Zhang and Shi (2022) reviewing 388-cited advances in indole derivatives.
Why It Matters
Organocatalytic methods enable sustainable synthesis of atropisomers for pharmaceuticals and ligands, avoiding metal residues. Tan group work (Zheng et al., 2017; 177 citations) accesses axially chiral styrenes as feedstocks; Shi's review (Zhang and Shi, 2022; 388 citations) highlights applications in biochemistry. Carmona et al. (2021; 379 citations) classify desymmetrizations expanding biaryl drug scaffolds.
Key Research Challenges
Broad Substrate Scope
Achieving high enantioselectivity across diverse (hetero)biaryls remains difficult due to varying steric demands. Carmona et al. (2021) note limitations in kinetic resolutions for polyfunctionalized scaffolds. Zhu et al. (2019) address o-quinone-aryl atropisomers but require optimized catalysts.
Catalyst Efficiency
Designing organocatalysts for cascade reactions with low catalyst loadings challenges scalability. Zhao et al. (2018) report NHC annulations needing precise control for axial chirality. Yang et al. (2019) use cooperative NHC strategies yet face yield trade-offs.
Mechanistic Understanding
Elucidating activation modes in phosphoric acid catalysis hinders predictive design. Wang et al. (2017) construct arylquinazolinones but lack full transition state models. Zheng et al. (2017) pioneer styrenes without detailed computational validation.
Essential Papers
Organocatalytic Atroposelective Synthesis of Indole Derivatives Bearing Axial Chirality: Strategies and Applications
Hong‐Hao Zhang, Feng Shi · 2022 · Accounts of Chemical Research · 388 citations
Catalytic atroposelective syntheses of axially chiral compounds have stimulated extensive interest in multiple communities, such as synthetic chemistry, biochemistry, and materials science, because...
Atroposelective transformation of axially chiral (hetero)biaryls. From desymmetrization to modern resolution strategies
José A. Carmona, Carlos Rodríguez-Franco, Rosario Fernández et al. · 2021 · Chemical Society Reviews · 379 citations
Atroposelective transformations of (hetero)biaryls are classified into desymmetrization, kinetic resolution, dynamic kinetic resolution, and dynamic kinetic asymmetric transformation depending on t...
Organocatalytic atroposelective synthesis of axially chiral styrenes
Sheng‐Cai Zheng, San Wu, Qinghai Zhou et al. · 2017 · Nature Communications · 177 citations
Abstract Axially chiral compounds are widespread in biologically active compounds and are useful chiral ligands or organocatalysts in asymmetric catalysis. It is well-known that styrenes are one of...
A Bird's Eye View of Atropisomers Featuring a Five‐Membered Ring
Damien Bonne, Jean Rodriguez · 2018 · European Journal of Organic Chemistry · 159 citations
An atropisomer is a member of a subclass of restricted rotational conformers – this restricted rotation giving rise to stereogenic sigma bonds – that can be isolated as separate chemical species. M...
Discovery and enantiocontrol of axially chiral urazoles via organocatalytic tyrosine click reaction
Jiwei Zhang, Jinhui Xu, Dao‐Juan Cheng et al. · 2016 · Nature Communications · 147 citations
Enantioselective [3+3] atroposelective annulation catalyzed by N-heterocyclic carbenes
Changgui Zhao, Donghui Guo, Kristin Munkerup et al. · 2018 · Nature Communications · 139 citations
Abstract Axially chiral molecules are among the most valuable substrates in organic synthesis. They are typically used as chiral ligands or catalysts in asymmetric reactions. Recent progress for th...
Brønsted acid-catalysed enantioselective construction of axially chiral arylquinazolinones
Yong‐Bin Wang, Sheng‐Cai Zheng, Yumei Hu et al. · 2017 · Nature Communications · 136 citations
Abstract The axially chiral arylquinazolinone acts as a privileged structural scaffold, which is present in a large number of natural products and biologically active compounds as well as in chiral...
Reading Guide
Foundational Papers
No pre-2015 papers available; start with Renzi (2017; 118 citations) for organocatalytic overview and Zheng et al. (2017; 177 citations) for styrenes as entry to methods.
Recent Advances
Zhang and Shi (2022; 388 citations) reviews indoles; Carmona et al. (2021; 379 citations) details biaryl strategies; Zhu et al. (2019; 120 citations) advances arylquinones.
Core Methods
Chiral phosphoric acids (Wang 2017), NHCs for annulations (Zhao 2018, Yang 2019), tyrosine click (Zhang 2016), with desymmetrization (Carmona 2021).
How PapersFlow Helps You Research Organocatalytic Atroposelective Reactions
Discover & Search
Research Agent uses searchPapers('organocatalytic atroposelective biaryls phosphoric acid') to retrieve Zhang and Shi (2022; 388 citations), then citationGraph reveals Tan group's styrenes paper (Zheng et al., 2017) and exaSearch uncovers NHC variants like Zhao et al. (2018). findSimilarPapers on Carmona et al. (2021) surfaces 379-cited desymmetrization strategies.
Analyze & Verify
Analysis Agent applies readPaperContent to parse mechanisms in Wang et al. (2017), verifies enantioselectivity claims via verifyResponse (CoVe) against GRADE A evidence, and runs PythonAnalysis to plot ee% vs. substrate scope from 10 papers using pandas for statistical correlation.
Synthesize & Write
Synthesis Agent detects gaps in five-membered ring atropisomers (Bonne and Rodriguez, 2018), flags contradictions between NHC methods (Zhao vs. Yang, 2018-2019), then Writing Agent uses latexEditText for reaction schemes, latexSyncCitations for 20-paper bibliography, and latexCompile for publication-ready reviews with exportMermaid for cascade diagrams.
Use Cases
"Plot ee values and yields from Tan group's organocatalytic atropisomer papers"
Research Agent → searchPapers → Analysis Agent → runPythonAnalysis (pandas/matplotlib extracts data from Zheng 2017, Zhu 2019, outputs ee/yield scatterplot with R² stats)
"Draft LaTeX review of phosphoric acid vs NHC atroposelective methods"
Synthesis Agent → gap detection → Writing Agent → latexEditText + latexSyncCitations (20 papers) + latexCompile → outputs compiled PDF with arylquinazolinone schemes from Wang 2017
"Find GitHub repos with computational models for organocatalytic atroposelectivity"
Research Agent → paperExtractUrls (Zhang 2022) → Code Discovery → paperFindGithubRepo → githubRepoInspect → returns DFT models for phosphoric acid transitions matching Shi review
Automated Workflows
Deep Research scans 50+ papers via searchPapers on 'organocatalytic atroposelective', structures reports ranking by citations (Zhang 2022 top), with CoVe checkpoints verifying biaryl claims. DeepScan's 7-steps analyze Carmona (2021) mechanisms, flagging substrate gaps. Theorizer generates hypotheses for cooperative NHC-Brønsted acids from Yang (2019) + Wang (2017).
Frequently Asked Questions
What defines organocatalytic atroposelective reactions?
These reactions employ chiral organocatalysts like phosphoric acids or NHCs for asymmetric bond formations creating axial chirality in biaryls, as in Zheng et al. (2017) styrenes and Zhao et al. (2018) annulations.
What are common methods?
Methods include Brønsted acid catalysis (Wang et al., 2017), NHC annulation (Zhao et al., 2018), and cooperative strategies (Yang et al., 2019), reviewed in Zhang and Shi (2022).
What are key papers?
Top-cited: Zhang and Shi (2022; 388 citations) on indoles; Carmona et al. (2021; 379 citations) on biaryl transformations; Zheng et al. (2017; 177 citations) on styrenes.
What open problems exist?
Challenges include low-loading catalysts for cascades and broad scopes for heterobiaryls; gaps persist in five-membered atropisomers (Bonne 2018) and mechanistic models.
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