Chemical Stability and Fate of the Cytostatic Drug Ifosfamide and Its N-Dechloroethylated Metabolites in Acidic Aqueous Solutions
作者:Véronique Gilard、Robert Martino、Myriam Malet-Martino、Ulf Niemeyer、Jörg Pohl
DOI:10.1021/jm980587g
日期:1999.7.1
N-dechloroethylated metabolites, namely, 2,3-didechloroethylIF (1a) and 2- (1b) and 3-dechloroethylIF (1c), in buffered solutions at acidic pH. The first stage of acid hydrolysis of these four oxazaphosphorines is a P-N bond cleavage of the six-membered ring leading to the phosphoramidic acid monoesters (2a-d) of type R'HN(CH(2))(3)OP(O)(OH)NHR, with R and/or R' = H or (CH(2))(2)Cl. The electron-withdrawing
使用31P NMR光谱研究抗肿瘤药异环磷酰胺(IF,1d)及其N-脱氯乙基化代谢产物即2,3-didechloroethylIF(1a)和2-(1b)和3-dechloroethylIF( 1c),在酸性pH值的缓冲溶液中。这四个氧杂氮膦的酸水解的第一阶段是六元环的PN键裂解,导致形成R'HN(CH(2))(3)OP(O)型的氨基磷酸单酯(2a-d) (OH)NHR,其中R和/或R'= H或(CH(2))(2)Cl。环内和/或环外氮上的吸电子氯乙基抵消了环内PN键的水解。当N-氯乙基处于环外位置时,由于稳定性的顺序为1d> 1c> 1b> 1a,所以这种效果更加明显。在水解的第二阶段 剩余的PN键与化合物2a-d的非P连接的氮在磷原子上的分子内侵蚀一起裂解。这导致形成一个R = H(3a来自化合物2a,c)或(CH(2))(2)Cl(3b来自化合物2b,d)的2-羟基氧杂氮磷环并释放氨