"The synthesis of some polycyclic N-H acids with quinoxaline and [1,2,4]triazine cycles"@en . . "1424-6376" . "0"^^ . "4"^^ . "Arkivoc" . "By diazotization of 3-(4-aminophenyl)-1,2-dihydro-quinoxaline-2-one (2b), 3-(2-aminophenyl)-6,7-dimethyl-1,2-dihydro-quinoxaline-2-one (1b), its 3-(4-aminophenyl)-isomer (3b), 3-(2-aminobenzyl)-1,2-dihydro-quinoxaline-2-one (4b), its 3-(4-aminobenzyl)-isomer (6b), 3-(2-aminobenzyl)-6,7-dimethyl-1,2-dihydro-quinoxaline-2-one (5b) and its 3-(4-aminobenzyl)-isomer (7b) and by azo coupling of formed diazonium salts with ethyl cyanoacetylcarbamate, 3-methyl-1,2-dihydro-quinoxaline-2-one, 3,6,7-trimethyl-1,2-dihydro-quinoxaline-2-one and 3-methyl-6,7-dichloro-1,2-dihydro-quinoxaline-2-one, corresponding hydrazones with one 1,2-dihydro-quinoxaline-2-one ring (1d, 3d, 5d, 7d) and hydrazones with two 1,2-dihydro-quinoxaline-2-one rings (3e-3g, 4e-4g, 5e-5g,6e-6g, 7e-7g) were prepared. Cyclization of hydrazones (1d, 3d, 5d, 7d) afforded compounds (1h, 3h, 5h, 7h) containing 6-azauracile and also 1,2-dihydro-quinoxaline-2-one rings in their molecules. The starting aminoderivative (1b) was prepared by the re"@en . "0"^^ . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . "St\u00FDskala, Jakub" . "Otyepka, Michal" . "4"^^ . "4" . "Fry\u0161ov\u00E1 - Wiedermanov\u00E1, Iveta" . . "RIV/61989592:15310/03:00001359!RIV/2004/GA0/153104/N" . . . "The synthesis of some polycyclic N-H acids with quinoxaline and [1,2,4]triazine cycles" . . . . . "Slouka, Jan" . "The synthesis of some polycyclic N-H acids with quinoxaline and [1,2,4]triazine cycles" . . "15" . . . . "10"^^ . "quinoxaline, 1,2,4-triazine"@en . "15310" . "[3C4BE3E69523]" . . . "The synthesis of some polycyclic N-H acids with quinoxaline and [1,2,4]triazine cycles"@en . . . . . "P(GP204/01/P117), Z(MSM 153100008)" . "630073" . . "65-74" . . "RIV/61989592:15310/03:00001359" . . "By diazotization of 3-(4-aminophenyl)-1,2-dihydro-quinoxaline-2-one (2b), 3-(2-aminophenyl)-6,7-dimethyl-1,2-dihydro-quinoxaline-2-one (1b), its 3-(4-aminophenyl)-isomer (3b), 3-(2-aminobenzyl)-1,2-dihydro-quinoxaline-2-one (4b), its 3-(4-aminobenzyl)-isomer (6b), 3-(2-aminobenzyl)-6,7-dimethyl-1,2-dihydro-quinoxaline-2-one (5b) and its 3-(4-aminobenzyl)-isomer (7b) and by azo coupling of formed diazonium salts with ethyl cyanoacetylcarbamate, 3-methyl-1,2-dihydro-quinoxaline-2-one, 3,6,7-trimethyl-1,2-dihydro-quinoxaline-2-one and 3-methyl-6,7-dichloro-1,2-dihydro-quinoxaline-2-one, corresponding hydrazones with one 1,2-dihydro-quinoxaline-2-one ring (1d, 3d, 5d, 7d) and hydrazones with two 1,2-dihydro-quinoxaline-2-one rings (3e-3g, 4e-4g, 5e-5g,6e-6g, 7e-7g) were prepared. Cyclization of hydrazones (1d, 3d, 5d, 7d) afforded compounds (1h, 3h, 5h, 7h) containing 6-azauracile and also 1,2-dihydro-quinoxaline-2-one rings in their molecules. The starting aminoderivative (1b) was prepared by the re" .