Cryptophycins are cytotoxic natural products that exhibit considerable activities even against multi-drug-resistant tumor cell lines. As fluorinated pharmaceuticals have become more and more important during the past decades, fluorine-functionalized cryptophycins were synthesized and evaluated in cell-based cytotoxicity assays. The unit A trifluoromethyl-modified cryptophycin proved to be highly active against KB-3-1 cells and exhibited an IC50 value in the low picomolar range. However, the replacement of the 3-chloro-4-methoxyphenyl-substituent in unit B by a pentafluorophenyl moiety resulted in a significant loss of activity.
Cryptophycins是细胞毒性天然产物,甚至对多药耐药的肿瘤细胞系表现出相当大的活性。随着氟化制药在过去几十年变得越来越重要,氟功能化的Cryptophycins被合成并在基于细胞的细胞毒性实验中进行了评估。三氟甲基修饰的Cryptophycin A单元被证明对KB-3-1细胞非常活跃,并在低皮克摩尔范围内显示出IC50值。然而,将单元B中的3-氯-4-甲氧基苯基取代为五氟苯基团导致活性显著降低。