A series of keto-substituted pyrazolo[3,4-b]quinolines, pyrazolo[3,4-b][1,8]naphthyridines, benzo[e]pyrazolo[3,4-b]azepines, benzo[g]pyrazolo[3,4-b]azocines, pyrazolo[3,4-b]pyrido[3,2-g]azocines, and benzo[g]pyrazolo[3,4-b]azonines scaffolds were synthesized via a Friedel–Crafts cyclialkylation approach. The precursor acids were obtained by utilizing the modified Ullman coupling reactions of 5-chloro-3-methyl-1-phenyl-1H-pyrazole-4-carboxylic acid with different aryl amines followed by ring closures in the presence of AlCl3/CH3NO2 or P2O5 or polyphosphoric acid catalysts. Particular attention is given to the novel structures especially in regard to the promising pharmaceutical and therapeutic values associated with their skeletons.
通过 Friedel-Crafts 环烷基化方法合成了吡唑并[3,4-b]吡啶并[3,2-g]偶氮杂环辛和苯并[g]吡唑并[3,4-b]偶氮杂环辛支架。前体酸是通过 5-氯-3-甲基-1-苯基-1H-吡唑-4-羧酸与不同芳基胺的改良乌尔曼偶联反应,然后在 AlCl3/CH3NO2 或 P2O5 或多磷酸催化剂存在下进行闭环而得到的。对这些新结构给予了特别关注,尤其是与其骨架相关的有前景的药物和治疗价值。