1-Substituted 3-alkyl/aryl-3-amino-1H,3H-quinoline-2,4-diones (6) react with nitrourea to give 3-ureido-1H,3H-quinoline-2,4-diones (10), 9b-hydroxy-3,3a,5,9b-tetrahydro-1H-imidazo[4,5-c]quinoline-2,4-diones (11), and 3,3a-dihydro-5H-imidazo[4,5-c]quinoline-2,4-diones (12). Compounds 11 were dehydrated to 12 by the action of phosphorus pentoxide. All three types of compounds rearrange in boiling acetic
1-取代的3-烷基/芳基-3-
氨基-1 H,3 H-
喹啉-2,4-二酮(6)与硝基
脲反应生成3-ureido-1 H,3 H-
喹啉-2,4-二酮(10),9b-羟基-3,3a,5,9b-四氢-1 H-
咪唑并[4,5 - c ]
喹啉-2,4-二酮(11)和3,3a-二氢-5 H -
咪唑并[4,5 - c ]
喹啉-2,4-二酮(12)。化合物11脱
水成12在五氧化二
磷的作用下。所有三种类型的化合物都在沸腾的
乙酸中重排,从而产生三种不同类型的分子重排产物。讨论了提出的反应机理。