Aqueous Conversion Kinetics and Mechanisms of Ancitabine, a Prodrug of the Antileukemic Agent Cytarabine
作者:Lee E. Kirsch、Robert E. Notari
DOI:10.1002/jps.2600730709
日期:1984.7
equal to 4, it is calculated that an aqueous ancitabine solution will maintain 90% of its initial concentration for 12 d. A novel method for measuring general-base catalysis in competition with predominating specific-base catalysis and in the presence of secondary salt effects at constant ionic strength was developed. Three mechanisms of hydrolytic prodrug conversion are proposed: nucleophilic hydroxide
已经在pH范围为1.5-10.7,温度范围为19.5-80.0摄氏度,离子强度范围为10(-4)至1.5和1.5到1.5的水溶液中研究了前药蒽醌转化为抗癌药物阿糖胞苷的动力学。在几种通用碱催化剂的存在下。在所有条件下,阿西他滨均定量转化为阿糖胞苷。pH速率曲线在碱性pH斜率= 1时呈线性关系,在pH小于或等于4的最大稳定性区域变为独立于pH的状态,在该区域中发现缓冲液催化作用不明显,并且kob大约等于(1.12 X 10 (11)h-1)-exp [-10121度/ T]。经计算,在30摄氏度,pH小于或等于4的情况下,阿糖胞苷水溶液将维持其初始浓度的90%达12天。开发了一种新的方法,该方法可在竞争中与特定的碱催化作用占优势,并且在恒定盐分离子强度下存在仲盐效应的情况下,测量一般碱的催化作用。提出了水解前药转化的三种机理:亲核氢氧化物的添加,一般的碱辅助亲核水攻击和自发水攻击。