To better understand acyl transfer reactions of oligopeptides, seventeen N-acyl amino acid esters were solvolyzed in mildly basic methanol-d4. All show pseudo-first-order kinetics by 1H NMR. The rate constant varies up to 400-fold with the identity of the amino acid and up to 6200-fold with the identity of the N-acyl group. The impact of the N-acyl group on the rate constant is discussed in terms of
为了更好地理解寡肽的酰基转移反应,在温和的碱性
甲醇-d 4中溶剂化了十七种N-酰基
氨基酸酯。通过1 H NMR均显示拟一级动力学。速率常数随
氨基酸的同一性而变化多达400倍,而随着N-酰基的同一性而变化高达6200倍。根据拥挤,酰胺构象和酰胺CO键特征讨论了N-酰基对速率常数的影响。