An alternative approach toward 2-aryl-2H-pyrazolo[4,3-c]-quinolin-3-ones by a multistep synthesis
作者:Marisa J. López Rivilli、Elizabeth L. Moyano、Gloria I. Yranzo
DOI:10.1016/j.tetlet.2009.10.123
日期:2010.1
carried out starting from dichloro- and bromoanilines (1a–b) and diethyl2-(ethoxymethylene)malonate using a slightly modified Gould-Jacobs reaction. In this work we present a novel chlorination strategy to prepare quinoline derivatives 4 in excellent yields as key intermediates in the synthesis of the target compounds. Several reaction conditions were evaluated to optimize the formation of pyrazoloquinolinone
方便地制备了一系列2-芳基-2 H-吡唑并[4,3 - c ]喹啉-3-酮衍生物6和7。从二氯苯甲烷和溴苯胺(1a – b)到2-(乙氧基亚甲基)丙二酸二乙酯,使用经过稍微修饰的Gould-Jacobs反应进行了多步合成。在这项工作中,我们提出了一种新颖的氯化策略,以高收率制备喹啉衍生物4作为目标化合物合成中的关键中间体。评价了几种反应条件以优化吡唑并喹啉酮核的形成。两种氯喹啉酮4a–b的化学行为差异 还讨论了与芳基和苄基肼形成的芳基。