Intramolecular Hydrogen Bond-Controlled Prolyl Amide Isomerization in Glucosyl 3′(<i>S</i>)-Hydroxy-5′-hydroxymethylproline Hybrids: Influence of a <i>C</i>-5′-Hydroxymethyl Substituent on the Thermodynamics and Kinetics of Prolyl Amide <i>Cis</i>/<i>Trans</i> Isomerization
作者:Kaidong Zhang、Robel B. Teklebrhan、G. Schreckenbach、Stacey Wetmore、Frank Schweizer
DOI:10.1021/jo9003458
日期:2009.5.15
permits tuning of the prolyl amide cis/trans isomer ratio. Inversion−magnetization transfer NMR experiments indicate that the stereochemistry of the hydroxymethyl substituent has a dramatic effect on the kinetics of prolyl amide cis/trans isomerization. A 200-fold difference in the trans-to-cis (ktc) isomerization and a 90-fold rate difference in the cis-to-trans (kct) isomerization is observed between epimeric