Synthesis of 7-Halogenated Isatin Sulfonamides: Nonradioactive Counterparts of Caspase-3/-7 Inhibitor-Based Potential Radiopharmaceuticals for Molecular Imaging of Apoptosis
作者:Panupun Limpachayaporn、Stefan Wagner、Klaus Kopka、Otmar Schober、Michael Schäfers、Günter Haufe
DOI:10.1021/jm500718e
日期:2014.11.26
N-Alkylated (S)-7-halogen-5-[1-(2-methoxymethylpyrrolidinyl)sulfonyl]isatins were developed as a new group of nonradioactive reference compounds for future radiotracers. Inhibitor potency studies of these compounds suggest that the binding pockets readily accommodate both the 7-halogen substituents and aliphatic side chains (methyl to n-butyl) as well as some ω-fluorinated analogues (3-fluoropropyl
N-烷基化的(S)-7-卤素-5- [1-(2-(甲氧基甲基吡咯烷基)磺酰基] isatins作为未来放射性示踪剂的一组新的非放射性参考化合物而开发。这些化合物的抑制剂效力的研究表明,该结合口袋容易地容纳7个卤素取代基和两个脂肪族侧链(甲基至Ñ丁基)以及在一些靛红ω氟化类似物(3-氟丙基和4-氟丁基)氮。实际上,与不含卤素的母体化合物相比,某些7卤代衍生物对IC 50的抑制效能略有提高值分别高达2.6 nM(caspase-3)和3.3 nM(caspase-7)。此外,潜在的细胞色素P450羟化位点的isatin的7位被I,Br,Cl和F取代,可以潜在地增强isatin磺酰胺的代谢稳定性。例如,由19 F / 18 F同位素交换产生的放射性示踪剂[ 18 F] 39在人血清中于37°C孵育至少90分钟后显示稳定。