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Axial and Atropisomeric Chirality Synthesis
Research Guide
What is Axial and Atropisomeric Chirality Synthesis?
Axial and atropisomeric chirality synthesis refers to the atroposelective preparation of axially chiral compounds, such as biaryls and helicenes, through enantioselective catalytic reactions including Suzuki-Miyaura coupling, oxidative coupling, and organocatalysis using chiral ligands.
The field encompasses 18,531 published works on atropisomerism and asymmetric synthesis of rotationally hindered biaryl axes. Key methods include organocatalytic Diels-Alder reactions and bifunctional thiourea catalysts for enantioselective Michael additions. Techniques like the Baylis-Hillman reaction and lanthanide-mediated couplings support construction of chiral frameworks in natural products.
Topic Hierarchy
Research Sub-Topics
Atroposelective Suzuki-Miyaura Coupling
This sub-topic develops chiral ligands and catalysts for enantioselective biaryl formation via Suzuki-Miyaura cross-coupling. Research optimizes reaction conditions for hindered atropisomers and scales to natural product synthesis.
Organocatalytic Atroposelective Reactions
Studies employ chiral phosphoric acids, imidazolidinones, and other organocatalysts for asymmetric C-C or C-H bond formations yielding axial chirality. Focus includes cascade reactions and activation modes for polyfunctionalized scaffolds.
Atropisomerism in Biaryl Natural Products
Researchers target total synthesis of axially chiral biaryls like vancomycin aglycon, mastigodiene, and korupensamine. Strategies emphasize diastereoselective construction and configurational stability assessments.
Chiral Ligand Design for Atroposelectivity
This area designs BINOL-derived, PHOX, and peptide ligands to induce axial chirality in metal-catalyzed couplings. Computational modeling guides steric and electronic optimization for high enantioselectivity.
Oxidative Coupling for Axial Chirality
Hypervalent iodine and transition metal oxidants enable enantioselective C-H arylation and biaryl formation with axial control. Mechanistic studies elucidate enantiodetermining steps and kinetic resolutions.
Why It Matters
Atroposelective synthesis enables production of axially chiral biaryl natural products with defined stereochemistry, essential for biological activity and as chiral auxiliaries or catalysts. Bringmann et al. (2010) in "Atroposelective Total Synthesis of Axially Chiral Biaryl Natural Products" detail syntheses of over 20 such compounds, including korupensamine A with >99% ee via lactone method, impacting pharmaceutical development. Bringmann et al. (2005) in "Atroposelective Synthesis of Axially Chiral Biaryl Compounds" cover applications in ligands for asymmetric catalysis, such as PPHOS achieving 99% ee in Pd-catalyzed reactions. Shen and Chen (2011) in "Helicenes: Synthesis and Applications" highlight helicenes in chiral recognition and materials, with [6]helicene derivatives showing fluorescence quantum yields up to 0.45 for OLEDs.
Reading Guide
Where to Start
"Atroposelective Synthesis of Axially Chiral Biaryl Compounds" by Bringmann et al. (2005) first, as it provides a comprehensive review of core methods like Pd-catalyzed couplings and lactone approaches with 1346 citations.
Key Papers Explained
Bringmann et al. (2005) in "Atroposelective Synthesis of Axially Chiral Biaryl Compounds" surveys general strategies; Bringmann et al. (2010) in "Atroposelective Total Synthesis of Axially Chiral Biaryl Natural Products" applies them to 20+ targets like knipholone; Shen and Chen (2011) in "Helicenes: Synthesis and Applications" extends to helical chirality; Ahrendt et al. (2000) and Okino et al. (2003) provide organocatalytic foundations building toward biaryl methods.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Focus shifts to non-preprint catalytic innovations; Bringmann reviews (2005, 2010) remain central with no new preprints in last 6 months. Frontiers involve hybrid organo-metal catalysis for polyatropisomers, per keyword trends in enantioselective organocatalysis.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Isolation, Structure, and Partial Synthesis of an Active Const... | 1964 | Journal of the America... | 2.4K | ✕ |
| 2 | New Strategies for Organic Catalysis: The First Highly Enanti... | 2000 | Journal of the America... | 1.6K | ✕ |
| 3 | Recent Advances in the Baylis−Hillman Reaction and Applications | 2003 | Chemical Reviews | 1.6K | ✕ |
| 4 | Helicenes: Synthesis and Applications | 2011 | Chemical Reviews | 1.5K | ✕ |
| 5 | Enantioselective Michael Reaction of Malonates to Nitroolefins... | 2003 | Journal of the America... | 1.4K | ✕ |
| 6 | Atroposelective Total Synthesis of Axially Chiral Biaryl Natur... | 2010 | Chemical Reviews | 1.4K | ✕ |
| 7 | Atroposelective Synthesis of Axially Chiral Biaryl Compounds | 2005 | Angewandte Chemie Inte... | 1.3K | ✕ |
| 8 | Asymmetric Organocatalysis | 2005 | — | 1.3K | ✕ |
| 9 | Application of electronic circular dichroism in configurationa... | 2007 | Chemical Society Reviews | 1.3K | ✕ |
| 10 | Divalent lanthanide derivatives in organic synthesis. 1. Mild ... | 1980 | Journal of the America... | 1.3K | ✕ |
Frequently Asked Questions
What is atropisomerism in biaryl compounds?
Atropisomerism arises from restricted rotation around a biaryl axis due to steric hindrance, creating stable axial chirality. Bringmann et al. (2005) in "Atroposelective Synthesis of Axially Chiral Biaryl Compounds" define it as the stereogenic element in natural products and catalysts. Enantioselective synthesis targets single atropisomers via chiral catalysts.
How does organocatalysis achieve enantioselectivity in axial chirality synthesis?
Organocatalysts with thiourea and tertiary amine groups activate substrates for asymmetric additions. Okino et al. (2003) in "Enantioselective Michael Reaction of Malonates to Nitroolefins Catalyzed by Bifunctional Organocatalysts" report up to 93% ee in Michael adducts. Ahrendt et al. (2000) in "New Strategies for Organic Catalysis: The First Highly Enantioselective Organocatalytic Diels−Alder Reaction" demonstrate >98% ee using iminium catalysis.
What are common methods for atroposelective biaryl synthesis?
Methods include Suzuki-Miyaura coupling with chiral ligands and oxidative biaryl formation. Bringmann et al. (2005) review lactone-mediated, Pd-catalyzed, and radical approaches yielding >95% ee. Bringmann et al. (2010) apply these to total syntheses of natural products like michellamine B.
What role do helicenes play in axial chirality research?
Helicenes exhibit helical chirality from ortho-fused rings, synthesized via photocyclization or coupling. Shen and Chen (2011) in "Helicenes: Synthesis and Applications" survey methods achieving multi-gram scales with 90-99% ee. They serve in chiral sensors and electronics.
How is stereochemistry determined in atropisomeric compounds?
Electronic circular dichroism (ECD) analyzes configurational and conformational chirality. Berova et al. (2007) in "Application of electronic circular dichroism in configurational and conformational analysis of organic compounds" describe ECD for biaryls, matching spectra to absolute configurations. It complements X-ray crystallography.
What is the current state of atropselective synthesis research?
The field includes 18,531 papers on enantioselective methods for biaryls and helicenes. Bringmann et al. (2005) and (2010) establish benchmarks with >1300 citations each for catalytic strategies. No recent preprints reported in last 6 months.
Open Research Questions
- ? How can atroposelectivity exceed 99% ee in late-stage biaryl couplings without racemization?
- ? What chiral ligands optimize Suzuki-Miyaura for tetra-ortho-substituted biaryls?
- ? Can organocatalytic methods scale to gram quantities for helicene natural products?
- ? Which dynamic kinetic resolutions best resolve pre-existing racemic atropisomers?
- ? How do remote substituents influence biaryl axis stability below 110°C?
Recent Trends
The field holds steady at 18,531 papers with no 5-year growth data or preprints in last 6 months.
Highly cited works like Bringmann et al. (2005, 1346 citations) and (2010, 1357 citations) dominate, emphasizing catalytic biaryl methods amid keyword focus on Suzuki-Miyaura and organocatalysis.
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