Peptide‐Catalyzed Fragment Couplings that Form Axially Chiral Non‐
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C
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‐Symmetric Biaryls
作者:Gavin Coombs、Marcus H. Sak、Scott J. Miller
DOI:10.1002/anie.201913563
日期:2020.2.10
We have demonstrated that small, modular, tetrameric peptides featuring the Lewis-basic residue β-dimethylaminoalanine (Dmaa) are capable of atroposelectively coupling naphthols and ester-bearing quinones to yield non-C2 -symmetric BINOL-type scaffolds with good yields and enantioselectivity. The study culminates in the asymmetric synthesis of backbone-substituted scaffolds similar to 3,3'-disubstituted
The selective FeCl3-catalyzed oxidative cross-coupling reaction between phenols and primary, secondary, and tertiary 2-aminonaphthalene derivatives was investigated. The generality of this scalable method provides a sustainable alternative for preparingN,O-biaryl compounds that are widely used as ligands and catalysts. Based on a comprehensive kinetic investigation, a catalytic cycle involving a ternary
A selectivity-driven catalyst design approach was adopted to address chemoselectivity issues in the oxidative coupling of phenols. This approach was utilized for developing a Co(II)[salen]-catalyzed aerobic oxidative cross-coupling of phenols in a recyclable 1,1,1,3,3,3-hexafluoropropan-2-ol (HFIP) solvent. The waste-free conditions offer a sustainable entry to nonsymmetric biphenols via a mechanistic
Direct entry to opticallypure 2-amino-2′-hydroxy-1,1′-binaphthyl (NOBIN) derivatives by an iron-catalyzed stereoselective oxidative cross-coupling reaction between 2-naphthol and 2-aminonaphthalene with a labile chiral auxiliary is reported. This efficient method offers entry to tailor-designed (Ra)- and (Sa)-NOBINs that are not accessible by any other means.