Pyrrolo-imidazo[1,2-<i>a</i>]pyridine Scaffolds through a Sequential Coupling of <i>N</i>-Tosylhydrazones with Imidazopyridines and Reductive Cadogan Annulation, Synthetic Scope, and Application
作者:Kena Zhang、Abderrahman El Bouakher、Helene Levaique、Jerome Bignon、Pascal Retailleau、Mouad Alami、Abdallah Hamze
DOI:10.1021/acs.joc.9b02018
日期:2019.11.1
of 3-phenyl-1H-pyrrolo-imidazo[1,2-a]pyridine backbone is described. The reaction starts from the coupling between N-tosylhydrazones and 2-chloro-3-nitroimidazo[1,2-a]pyridines leading to the formation of 3-nitro-2-(arylvinyl)imidazo[1,2-a]pyridine derivatives. Optimization of Cadogan-reductive conditions allowed the conversion of the obtained nitro derivative to a new scaffold of the type 3-aryl-
描述了构建3-苯基-1H-吡咯并咪唑并[1,2-a]吡啶骨架的新策略。反应从N-甲苯磺酰hydr与2-氯-3-硝基咪唑并[1,2-a]吡啶之间的偶联开始,导致3-硝基-2-(芳基乙烯基)咪唑并[1,2-a]吡啶衍生物的形成。Cadogan还原条件的优化允许将获得的硝基衍生物转化为新的3-芳基-1H-吡咯并咪唑并[1,2-a]吡啶型支架。该方法在面向多样性的合成中提供了对新文库的快速访问,该合成旨在以有效的方式生成具有大结构多样性的小分子。筛选出新产生的化合物的生物活性后,鉴定出了一种新的有前途的化合物5cc,