Formation of 2,3-dihydro-4(1H)-quinolones and related compounds via Fries-type acid-catalysed rearrangement of 1-arylazetidin-2-ones
作者:Shinto Kano、Tsutomu Ebata、Shiroshi Shibuya
DOI:10.1039/p19800002105
日期:——
corresponding 2,3-dihydro-4(1H)-quinolones via acyl migration and N–CO fission. In the case of 1-(3-substituted phenyl)azetidin-2-ones, two positional isomeric products, 5- and 7-substituted 2,3-dihydro-4(1H)-quinolones were obtained. 4-Methyl-, 4-ethoxycarbonyl-, and 4-piperidin-2yl-1-arylazetidin-2-ones and their analogues were also converted into the corresponding 2-substituted 2,3dihydro-4(1H)-quinolones
各种1-芳基氮杂环丁烷-2-酮在回流下用三氟乙酸,100°C或浓的甲磺酸处理。通过酰基迁移和N–CO裂变生成硫酸,得到相应的2,3-二氢-4(1 H)-喹诺酮。在1-(3-取代的苯基)氮杂环丁烷-2-酮的情况下,获得两个位置异构产物,即5-和7-取代的2,3-二氢-4(1H)-喹诺酮。在酸性条件下,还将4-甲基-,4-乙氧基羰基-和4-哌啶-2-基-1-芳基氮杂环丁烷-2-酮及其类似物转化为相应的2-取代的2,3-二氢-4(1 H)-喹诺酮。 。3-取代的1-苯基氮杂环丁烷-2-酮(36)和(37)被转化为呋喃[3,2- c通过应用该方法分别制得]喹啉系统(38)和(40)。