Metal-free C–N bond formations: one-pot synthesis of pyrido[2′,1′:2,3]imidazo[4,5-c]cinnolines, benzo[4′,5']thiazolo- and thiazolo[2′,3′:2,3]imidazo[4,5-c]cinnolines
作者:Satheeshkumar Reddy Kandimalla、Gowravaram Sabitha
DOI:10.1039/c6ra15418b
日期:——
An efficient one-pot synthesis of novel pyrido[2′,1′:2,3]imidazo[4,5-c]cinnoline derivatives has been achieved with moderate to good yields, with two C–N bond formations through C–H functionalization of 2-arylimidazo[1,2-a]pyridines. The reaction proceeds via C-3 regioselective hydrazination with diisopropyl azodicarboxylate followed by oxidative N-arylation mediated by phenyliodine(III) diacetate
一种高效的一锅合成新型吡啶并[2',1':2,3]咪唑并[4,5- c ] cinnoline衍生物已实现,具有中等至良好的产率,并通过CH形成了两个C–N键2-芳基咪唑并[1,2- a ]吡啶的官能化。反应通过偶氮二异丙基二异丙基酯的C-3区域选择性酰化进行,然后通过C–H官能化在三氟乙酸中由苯基碘(III)二乙酸酯(PIDA)介导的氧化N-芳基化反应生成吡啶基[2',1':2, 3]咪唑并[4,5- c ] cinnolines。其他imidazoheterocycles如2-芳基苯并[ d ]咪唑并[2,1- b ]噻唑和6-芳基咪唑并[2,1- b对噻唑在无过渡金属和温和条件下进行相似的转化,得到相应的辛啉。