In situ preparation and fate of cis-4-hydroxycyclophosphamide and aldophosphamide: proton and phosphorus-31 NMR evidence for equilibration of cis- and trans-4-hydroxycyclophosphamide with aldophosphamide and its hydrate in aqueous solution
作者:Richard F. Borch、Thomas R. Hoye、Todd A. Swanson
DOI:10.1021/jm00370a010
日期:1984.4
reduction of cis-4-hydroperoxycyclophosphamide (8) and by sodium periodate cleavage of 3,4-dihydroxybutyl N,N-bis(2-chloroethyl)phosphorodiamidate (9), respectively; the reactions of 2 and 4 were examined by 1H and 31P NMR. Within 30-60 min (pH or pD 7.0, 25 degrees C) the same pseudoequilibrium mixture was established in both reactions, with cis- and trans-4-hydroxycyclophosphamide (2 and 3), aldophosphamide
顺式-4-羟基过氧环磷酰胺(8)的二甲硫键还原和3,4-二羟基丁基N,N-双的高碘酸钠裂解在顺式磷酸酯或椰油酸酯缓冲液中生成顺式-4-羟基环磷酰胺(2)和醛基磷酸酯(4)。 (2-氯乙基)二氨基磷酸二酰胺酯(9);1 H和31 P NMR检查2和4的反应。在30-60分钟内(pH或pD 7.0,25摄氏度),在两个反应中都建立了相同的拟平衡混合物,分别带有顺式和反式-4-羟基环磷酰胺(2和3),醛磷酸酰胺(4)及其水合物(5 )的比例大约为4:2:0.3:1。根据对D2O缓冲液中确定的质子谱中的化学位移和偶合常数的分析,明确分配了中间体的结构,和31P分配,然后是平衡时组分比率的相关性。分别在2、3、5和4之间估计25°C下0.4、0.4和0.7 kcal / mol的自由能差,其中2最为稳定。醛4与水反应最快,得到水合物5;醛4与水反应最快。4至3的环化速度比2快,环化至2的速度与消除6