Hydrolysis of Active Esters of Aliphatic Carboxylic Acids with Cyclic Dipeptide Catalysts Consisting of L-Histidine and Different Aliphatic α-Amino Acids
at 25 °C, pH 7.8 using cyclic dipeptides[cyclo(–L- or D-Xyz–His–) consisting of L-histidine (L-His) and an α-amino acid (Xyz) with different aliphatic side chains] as catalysts. Consequently, cyclo(–D-Leu–L-His–) and cyclo(–D-Val–L-His–) were found to be specifically effective catalysts for the hydrolysis of p-nitrophenyl laurate. These trans (D-L-type) cyclic dipeptides were much more efficient catalysts