Peptide-Catalyzed Conversion of Racemic Oxazol-5(4H)-ones into Enantiomerically Enriched α-Amino Acid Derivatives
摘要:
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.
Peptide-Catalyzed Conversion of Racemic Oxazol-5(4H)-ones into Enantiomerically Enriched α-Amino Acid Derivatives
摘要:
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.
[EN] C-4" POSITION SUBSTITUTED MACROLIDE DERIVATIVE<br/>[FR] DÉRIVÉ DE MACROLIDE SUBSTITUÉ EN POSITION C-4"
申请人:TAISHO PHARMA CO LTD
公开号:WO2012115256A1
公开(公告)日:2012-08-30
A macrolide compound represented by the formula (I) effective against erythromycin resistant bacteria (for example, resistant pneumococci, streptococci and mycoplasmas).