Synthesis of Novel Benzimidazolyl-substituted Acrylonitriles and Amidino-substituted Benzimidazo[1,2-a]Quinolines
作者:Marijana Hranjec、Grace Karminski-Zamola
DOI:10.3390/12081817
日期:——
A series of novel benzimidazole derivatives 3-10 were synthesized. Benzimidazolyl-substituted acrylonitriles 3 and 4 underwent a photochemical dehydrocyclization reaction to give the corresponding mono- and dicyano-substituted benzimidazo[1,2-a] quinolines 5 and 6. Pinner reaction of these compounds did not give the expected mono- and diamidines, but rather only compounds 7-10, with amido groups at 6-position were isolated. A mechanism for the reaction is proposed. Acyclic compounds 3 and 4, as well as cyclic benzimidazo[1,2-a]quinolines 5-8, exhibit interesting spectroscopic properties and are potential biologically active compounds.
合成了一系列新型苯并咪唑衍生物3-10。苯并咪唑基取代的丙烯腈3和4经过光化学脱环反应生成了相应的单氰和双氰取代的苯并咪唑[1,2-a]喹啉5和6。这些化合物的皮纳反应并没有生成预期的单和双酰胺,而仅得到含有氨基取代基的化合物7-10。提出了一种反应机制。开放链化合物3和4,以及环状苯并咪唑[1,2-a]喹啉5-8,展示了有趣的光谱特性,并且是潜在的生物活性化合物。