Reaction of 3-Hydroxyquinoline-2,4-diones with Isocyanates and Thermally Induced Transformation of the Reaction Products
作者:Vladimír Mrkvička、Antonín Lyčka、Robert Vícha、Antonín Klásek
DOI:10.1002/hlca.201000128
日期:2011.1
3‐Hydroxyquinoline‐2,4‐diones 1 react with isocyanates to give novel 1,2,3,4‐tetrahydro‐2,4‐dioxoquinolin‐3‐yl (alkyl/aryl)carbamates 2 and/or 1,9b‐dihydro‐9b‐hydroxyoxazolo[5,4‐c]quinoline‐2,4(3aH,5H)‐diones 3. Both of these compounds are converted, by boiling in cyclohexylbenzene solution in the presence of Ph3P or 4‐(dimethylamino)pyridine, to give 3‐(acyloxy)‐1,3‐dihydro‐2H‐indol‐2‐ones 8. All
3-羟基喹啉-2,4-二酮1与异氰酸酯反应生成新颖的1,2,3,4-四氢-2-2,4-二氧喹啉-3-基(烷基/芳基)氨基甲酸酯2和/或1,9b-二氢‐9b‐羟基恶唑啉[5,4‐ c ]喹啉‐2,4(3a H,5 H)‐二酮3。通过在Ph 3 P或4-(二甲氨基)吡啶的存在下在环己基苯溶液中煮沸将这两种化合物转化为3-(酰氧基)-1,3-二氢-2 H-吲哚-2-酮8。所有化合物均通过IR,1 H-和13 C-NMR光谱以及EI质谱进行表征。