Phosphorus-31 NMR and chloride ion kinetics of alkylating monoester phosphoramidates
作者:Kristin M. Fries、Richard F. Borch
DOI:10.1021/jm00106a014
日期:1991.2
conditions. Halide ion kinetics were used to determine the rate of aziridinium ion formation. The solvolysis rates showed the expected dependence upon substitution at the reactive nitrogen; comparison of 4a with phosphoramide mustard (1a) indicated that replacement of the amino group by alkoxy decreased the solvolysis rate by approximately 10-fold. The rate of conversion of starting compound (4a-d) to solvolysis
31 P NMR光谱用于研究模型生理条件下一系列新型烷基化单酯氨基磷酸酯(4a-d)的溶剂分解动力学。卤离子动力学用于确定叠氮鎓离子形成的速率。溶剂分解速率显示出预期的对反应性氮取代的依赖性。将4a与磷酰胺芥末(1a)进行比较表明,用烷氧基取代氨基会使溶剂分解速率降低约10倍。起始化合物(4a-d)转化为溶剂分解产物的速率基本上等于卤离子的释放速率,这表明叠氮鎓离子是短寿命的中间体。在不存在和存在捕集剂(二甲基二硫代氨基甲酸酯)的情况下进行的1H NMR和31P NMR动力学实验证实,叠氮鎓离子的寿命太短,无法通过NMR观察到。还测试了这些化合物对L1210白血病和B16黑色素瘤细胞的细胞毒性。单烷基化剂4c和4d没有活性,4a具有弱的细胞毒性,而4b的活性与磷酰胺芥菜相当。