A carbamate-based approach to primaquine prodrugs: Antimalarial activity, chemical stability and enzymatic activation
作者:Graça Mata、Virgílio E. do Rosário、Jim Iley、Luís Constantino、Rui Moreira
DOI:10.1016/j.bmc.2011.11.059
日期:2012.1
and O-alkyl carbamates are activated in rat liver homogenates with half-lives ranging from 9 to 15 h, while the 4-nitrophenyl carbamate was hydrolysed too rapidly to determine an accurate rate constant. Antimalarial activity was studied using a model consisting of Plasmodium berghei, Balb C mice and Anopheles stephensi mosquitoes. When compared to controls, ethyl and n-hexyl carbamates were able to
合成了抗疟疾药物伯氨喹的O-烷基和O-芳基氨基甲酸酯衍生物,作为潜在的前药,可以防止非活性代谢产物羧基伯氨喹的氧化脱氨作用。既ø -烷基和ö -芳基氨基甲酸盐进行水解在碱性和pH为7.4的磷酸盐缓冲液为母药,与ö -芳基氨基甲酸盐是约 10 6 –10 10比其O-烷基对应物更具反应性。在人血浆Ø烷基氨基甲酸酯是稳定的,而与此相反的Ø芳基对应物迅速释放出相应的苯酚产物,而伯氨喹在较长的孵育时间内仅缓慢释放。人体血浆中O-芳基氨基甲酸酯的活化似乎由丁酰胆碱酯酶(BuChE)催化,该酶导致酶催化丝氨酸的氨基甲酰化,随后发生缓慢的酶再活化和母体药物释放。在大鼠肝匀浆中,大多数O-芳基和O-烷基氨基甲酸酯被激活,半衰期为9至15小时,而4-硝基苯基氨基甲酸酯的水解速度太快,无法确定准确的速率常数。使用由伯氏疟原虫,Balb C小鼠和斯蒂芬斯按蚊(Anopheles stephensi)蚊子。与对照