Improved Synthesis of Indirubin Derivatives by Sequential Build-Up of the Indoxyl Unit: First Preparation of Fluorescent Indirubins
作者:Herbert M. Riepl、Corinna Urmann
DOI:10.1002/hlca.201200042
日期:2012.8
synthesis of its derivatives relies on the combination of isatins and 2,3‐dihydro‐1H‐indol‐3‐one (‘indoxyl’) derivatives and usually yields indigo as well as other by‐products. Inspection of the hydrolysis of the long‐known condensation products of 2‐thioxothiazolidin‐4‐one with isatins gave useful hints for an improved synthesis of indirubins: this reaction does not yield quinoline derivatives but 2‐(2,
靛玉红,存在于提取物板蓝根和其它一些植物物种,有希望的细胞毒性对通过抑制细胞周期蛋白依赖性激酶的多种细胞系。其衍生物的化学合成依赖于靛红和2,3-二氢-1 H-吲哚-3-酮('indoxyl')衍生物的组合,通常会产生靛蓝以及其他副产物。检查2-硫代噻唑并恶唑啉-4-酮与靛红的长期缩合产物的水解,为改善靛玉红的合成提供了有用的提示:此反应不会产生喹啉衍生物,但会生成2-(2,3-二氢-2-酮氧代1 H吲哚3亚基)2硫烷基乙酸。通过用苯胺取代该羟吲哚中的硫烷基,并在室温下直接环化因此,在纳扎罗夫条件下,通常可以以很高的纯度和收率得到在吲哚环系统中取代的各种靛玉红。在这个反应顺序使用萘胺的产生的各种荧光物质用λ FL在约 630纳米