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。
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。
Reaction of 1-alkyl/aryl-3-amino-1H,3H-quinoline-2,4-diones with urea. Synthetic route to novel 3-(3-acylureido)-2,3-dihydro-1H-indol-2-ones, 4-alkylidene-1′H-spiro[imidazolidine-5,3′-indole]-2,2′-diones, and 3,3a-dihydro-5H-imidazo[4,5-c]quinoline-2,4-diones
1-Substituted 3-alkyl/aryl-3-amino-1H,3H-quinoline-2,4-diones react with urea in boiling acetic acid to give products depending on the type of substitution in position 3 and at the nitrogen atom of the 3-amino group. Starting compounds bearing a primary amino group in position 3 give 3-(3-acylureido)-2,3-dihydro-1H-indol-2-ones. Starting compounds bearing a secondary amino group in position 3 react
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
Molecular rearrangement of 1-substituted 3-aminoquinoline-2,4-diones in their reaction with urea and nitrourea synthesis and transformations of reaction intermediates
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。