Substituent effects on the kinetics of reductively-initiated fragmentation of nitrobenzyl carbamates designed as triggers for bioreductive prodrugs
作者:Michael P. Hay、Bridget M. Sykes、William A. Denny、Charmian J. O’Connor
DOI:10.1039/a904067f
日期:——
evaluated as bioreductive drugs, there has been no systematic study of substituent effects on the rate of this fragmentation (which should be as fast as possible following reduction). We therefore prepared a series of 2-, 3- and α-substituted 4-[N-methyl-N-(4-nitrobenzyloxycarbonyl)amino]phenylacetamides as model compounds to study these effects. The majority of the carbamates were prepared by in situ formation
4-硝基苄基氨基甲酸酯是引起生物还原性药物的诱因,特别是与E.coli B硝基还原酶联用,可有效地将它们还原为相应的羟胺。然后,它们会碎裂,释放出高毒性的胺基毒素。尽管许多4-硝基苄基氨基甲酸酯衍生物已被评估为生物还原药物,但尚未系统地研究取代基对这种断裂速率的影响(还原后应尽可能快)。因此,我们制备了一系列2-,3-和α-取代的4- [ N-甲基-N-(4-硝基苄氧基羰基)氨基]苯基乙酰胺作为模型化合物,以研究这些作用。大多数氨基甲酸酯是原位制备的形成适当的4-硝基苄醇的氯甲酸酯,并与4-(甲基氨基)苯基乙酸甲酯反应,然后进行酯水解和1,1'-羰基二咪唑(CDI)介导的与N,N-二甲基氨基乙胺的偶联。通过在磷酸盐缓冲的丙-2-醇水溶液中对硝基化合物进行60 Coγ射线辐照产生羟胺。将反应物用反相HPLC进行分析,以确定最大的半衰期(M吨1/2所产生的羟胺的),并从这些胺的释放后10个半衰