The synthesis of the first spacer containing, duocarmycin analogue prodrug 11 was realised, its biological properties evaluated and compared to its counterpart prodrug 2 without a spacer unit. The synthesis comprises the manufacture of the new acetylated derivatives 19 and 20b of two double spacer systems, their activation and coupling to the pharmacophoric seco-drug (+)-3. Unprecedented biological results were found as the new prodrug 11 showed a fairly low QIC50 value of 20, but on the other hand a high stability and very low DNA alkylation efficiency. These findings indicate a changed cytostatic mode of action induced by the self-immolative spacer moiety which was employed.
我们合成了第一种含有间隔物的双
卡马西平类似物原药 11,对其
生物特性进行了评估,并将其与不含间隔物单元的同类原药 2 进行了比较。合成过程包括制造两个双间隔物系统的新乙酰化衍
生物 19 和 20b,将其活化并与药效(+)-3 的secondo-药物偶联。结果发现,新原药 11 的 QIC50 值为 20,相当低,但另一方面却具有很高的稳定性和很低的 DNA 烷基化效率,这在
生物学上是前所未有的。这些发现表明,所采用的自惰性间隔分子改变了细胞抑制作用模式。