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。
acetic acid to give ureido- or thioureidooxindoles, spiro-oxindoles and dihydroimidazoquinolones. However, if the starting compounds are substituted with a benzyl group at position 3, a C-debenzylation proceeds to give imidazoquinolones. According to a proposed reaction mechanism, a molecular rearrangement of the primarily formed mono-substituted urea or thiourea takes place. All compounds were characterized