Structure Dependence in the Solvolysis Kinetics of Amino Acid Esters
Chemistry and Biochemistry
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 const. 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 const. is discussed in terms of crowding, amide conformation, and amide C=O bond character.