Peptide‐Catalyzed Fragment Couplings that Form Axially Chiral Non‐
<i>
C
<sub>2</sub>
</i>
‐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
Structural studies of β-turn-containing peptide catalysts for atroposelective quinazolinone bromination
作者:A. J. Metrano、N. C. Abascal、B. Q. Mercado、E. K. Paulson、S. J. Miller
DOI:10.1039/c6cc01428c
日期:——
X-Ray crystallography and NMR spectroscopy were used to investigate the effect of primary structure on both secondary structure and enantioselectivity in peptide-based catalysts for an atroposelective bromination reaction.
Peptide-Catalyzed Conversion of Racemic Oxazol-5(4<i>H</i>)-ones into Enantiomerically Enriched α-Amino Acid Derivatives
作者:Anthony J. Metrano、Scott J. Miller
DOI:10.1021/jo402828f
日期:2014.2.21
We report the development and optimization of a tetrapeptide that catalyzes the methanolytic dynamic kinetic resolution of oxazol-5(4H)-ones (azlactones) with high levels of enantioinduction. Oxazolones possessing benzylic-type substituents were found to perform better than others, providing methyl ester products in 88:12 to 98:2 er. The mechanism of this peptide-catalyzed process was investigated through truncation studies and competition experiments. High-field NOESY analysis was performed to elucidate the solution-phase structure of the peptide, and we present a plausible model for catalysis.