Journal
COORDINATION CHEMISTRY REVIEWS
Volume 286, Issue -, Pages 1-16Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2014.11.011
Keywords
Palladium; Asymmetry catalysis; Suzuki-Miyaura coupling; Axially chiral biaryls
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Funding
- National Natural Science Foundation of China [20972031, 21272040]
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Axially chiral biaryls exist widely in bioactive natural products and auxiliary ligands for homogeneous catalysis. The particular spatial arrangement of the two aromatic rings in the specific space determines their unique properties; therefore, how to effectively control their absolute configuration is the key issue. Within the last decade, the synthesis of axially chiral biaryls has been a research topic of great interest. Asymmetric biaryl coupling controlled by chiral palladium catalysts was first reported in 2000 and has greatly advanced the chemistry of transition-metal-catalyzed cross-coupling reactions. Most notably, some novel chiral auxiliary ligands such as ferrocene- or biaryl backbone-containing monophosphine, bisphosphines, bis-hydrazones, hydrazone-phosphines, diene and NHC ligands have been applied to this reaction. At the same time a broad range of aryl electrophiles such as phenols, aryl ethers, esters, carbonates, carbamates, sulfamates, phosphates, phosphoramides, phosphonium salts, and fluorides can now be coupled efficiently with boron reagents to afford functionalized axially chiral biaryl products with good to excellent yields and enantioselectivities in the presence of chiral palladium catalysts. In this review, we would like to summarize three main categories of chiral catalysts with discussion of their advantages and limitation. (C) 2014 Elsevier B.V. All rights reserved.
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