Hydrolytic Reactions of Diribonucleoside 3‘,5‘-(3‘-<i>N</i>-Phosphoramidates): Kinetics and Mechanisms for the P−O and P−N Bond Cleavage of 3‘-Amino-3‘-deoxyuridylyl-3‘,5‘-uridine
Hydrolytic reactions of 3'-amino-3'-deoxyuridylyl-3',5'-uridine (2a), an analogue of uridylyl-3',5'-uridine having the 3'-bridging oxygen replaced with nitrogen, have been followed by RP HPLC over a wide pH range. The only reaction taking place under alkaline conditions (pH > 9) is hydroxide ion-catalyzed hydrolysis (first-order in [OH(-)]) to a mixture of 3'-amino-3'-deoxyuridine 3'-phosphoramidate (7)