3.8 Review

Construction of axially chiral compounds via catalytic asymmetric radical reaction

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Summary: This study presents a new catalytic asymmetric synthesis method for the construction of axially and centrally chiral heterobiaryls. By combining an organic photoredox catalyst and a chiral phosphoric acid catalyst, the researchers achieved the metal-free construction of these complex molecules with excellent selectivity. This finding not only provides a new platform for the development of asymmetric desymmetrization methods but also opens up new possibilities for the synthesis of optically pure materials.

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Summary: A photo-promoted, three-component, asymmetric free radical reaction has been developed for the synthesis of axially chiral compounds with high enantioselectivity. This method shows great potential for various applications.

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Summary: This article comprehensively summarizes the research progress of atropisomeric C-N compounds, with a focus on their synthetic strategies, and provides insights into future advancements.

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Summary: Atropisomeric compounds, which exhibit restricted rotation of a single bond, are an important class of chiral molecules that have garnered significant attention in recent years. They are not only used as catalysts and ligands in asymmetric synthesis, but also commonly found in drug discovery and natural products. The review highlights the recent advances in the stereoselective synthesis of atropisomers using central-to-axial chirality transfer.

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Summary: A copper-catalyzed asymmetric radical 1,4-carboalkynylation of 1,3-enynes has been reported, providing diverse synthetically challenging tetrasubstituted chiral allenes. The use of a chiral N,N,P-ligand is crucial for both reaction initiation and enantiocontrol over the highly reactive allenyl radicals. The reaction shows broad substrate scope and excellent functional group tolerance.

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Jun Kee Cheng et al.

Summary: Atropisomerism is a stereochemical behavior exhibited by three-dimensional molecules with rotationally restricted sigma bonds, and compounds with atropisomerically chiral properties are increasingly utilized in fields where molecular asymmetry is influential. There is a steady demand for atroposelective synthesis, leading to conceptually novel and streamlined methods for expanding the structural diversity of atropisomers. This review summarizes key achievements in the stereoselective preparation of biaryl, heterobiaryl, and nonbiaryl atropisomers between 2015 and 2020, emphasizing synthetic strategies for each structural class and potential applications of atropochiral targets.

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Summary: The research investigated the photochemical deracemization of 2,4-disubstituted 2,3-butadienamides using experimental and theoretical approaches. A chiral sensitizer was found to catalyze the reaction, leading to the isolation of enantioenriched allene amides with high yield. The study revealed the binding properties and selectivity differences between the two enantiomers through luminescence data, DFT calculations, and NMR titration.

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Enantioselective Copper-Catalyzed Radical Cyanation of Propargylic C-H Bonds: Easy Access to Chiral Allenyl Nitriles

Ronghua Lu et al.

Summary: The first enantioselective copper-catalyzed cyanation of propargylic C-H bonds via radical relay has been established using novel Box(OTMS) ligands, providing an efficient tool for constructing structurally diverse chiral allenyl nitriles with high yields and excellent enantioselectivities. The reaction features high functional group tolerance and mild conditions, and the chiral allene products can be easily converted to other chiral compounds via axis-to-center chirality transfer.

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Yong-Bin Wang et al.

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Peter W. Glunz

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Unique Strategies for Controlling Enantioselective Stereochemistry of Cyclizations via Radical Intermediates

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EUROPEAN JOURNAL OF ORGANIC CHEMISTRY (2017)

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Enantioselective Oxidative Homocoupling and Cross-Coupling of 2-Naphthols Catalyzed by Chiral Iron Phosphate Complexes

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Chiral Monophosphorus Ligands for Asymmetric Catalytic Reactions

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