Friedländer reaction/quinoxalinone–benzimidazole rearrangement sequence: expeditious entry to diverse quinoline derivatives with the benzimidazole moieties
作者:Vakhid A. Mamedov、Saniya F. Kadyrova、Nataliya A. Zhukova、Venera R. Galimullina、Fedor M. Polyancev、Shamil K. Latypov
DOI:10.1016/j.tet.2014.06.007
日期:2014.9
3-(2-aminophenyl)quinoxalin-2(1H)-ones and ketones, including acetone, acetophenones, 1,3-pentanedione and ethyl acetoacetate. The selective formation of the very different quinoline derivatives depends on the structure of ketones. The key steps are proposed to involve the new acid-catalyzed rearrangement of the spiro-quinoxalinone derivatives formed in situ from the reaction of 3-(2-aminophenyl)quinoxalin-2(1H)-ones
已开发出一种通过3-(2-氨基苯基)喹喔啉-2(1 H)-酮与酮(包括丙酮,苯乙酮,1 )的反应有效合成结构多样的4-(苯并咪唑-2-基)喹啉的方案。,3-戊二酮和乙酰乙酸乙酯。差异很大的喹啉衍生物的选择性形成取决于酮的结构。建议的关键步骤涉及由3-(2-氨基苯基)喹喔啉-2(1 H)反应原位形成的螺-喹喔啉酮衍生物的新酸催化重排)-酮和酮在改良的Friedländer反应下进行。该转化将通过短的反应时间,大规模的合成,产物的简单而迅速的分离来促进合成,这是该方法的主要优点。