Reaction of 3-aminoquinoline-2,4-diones with nitrourea. Synthetic route to novel 3-ureidoquinoline-2,4-diones and imidazo[4,5-c]quinoline-2,4-diones
作者:Antonín Klásek、Antonín Lyčka、Michal Holčapek、Ignác Hoza
DOI:10.1016/j.tet.2004.07.106
日期:2004.10
with nitrourea in dioxane affords novel 3-alkyl/aryl-3-ureido-1H,3H-quinoline-2,4-diones or 9b-hydroxy-3a-alkyl/aryl-3,3a,5,9b-tetrahydro-1H-imidazo[4,5-c]quinoline-2,4-diones, which can smoothly be dehydrated to 3a-alkyl/aryl-3,3a-dihydro-5H-imidazo[4,5-c]quinoline-2,4-diones. All three types of products can be converted to 2,6-dihydro-imidazo[1,5-c]quinazoline-3,5-diones by refluxing in acetic acid
1-未取代的3-烷基/芳基-3-氨基-1 H,3 H-喹啉-2,4-二酮在沸腾的乙酸中与1-取代的和1,1-二取代的脲反应,生成2,6-二氢-咪唑并[1,5 - c ]喹唑啉-3,5-二酮。相比之下,这些胺与硝基脲在二恶烷中的反应提供了新型的3-烷基/芳基-3-脲基-1 H,3 H-喹啉-2,4-二酮或9b-羟基-3a-烷基/芳基-3, 3a,5,9b-四氢-1 H-咪唑并[4,5 - c ]喹啉-2,4-二酮,可以平稳地脱水成3a-烷基/芳基-3,3a-二氢-5 H-咪唑并[ 4,5 - c ]喹啉-2,4-二酮。所有这三种类型的产品都可以转化为2,6-二氢咪唑[1,5- c通过在乙酸中回流得到]喹唑啉-3,5-二酮。