Abstract
Photolysis of 1
H
‐azepine‐2,7‐dione
2
proceeded with alkali as in the photoreaction of
N
‐alkylimide to give 7‐hydroxy‐1
H
‐azepine‐2‐one
13
.
A reaction from various kinds of nitroquinoline with hydroxylamine in potassium hydroxide alkalinity produced a novel product, furazanoquinoline, besides the known amino derivatives. The products ...obtained were furazano 3,4-f quinoline (5) from 5-nitroquinoline (1) and 6-nitroquinoline (6), and furazano 3,4-h quinoline (10) from 7-nitroquinoline (8) and 8-nitroquinoline (11). The reaction mechanism was believed to be as shown in Figs. 2 and 3. The photoreaction of benzofuroxan (19) in acetonitrile containing a little water, under a high pressure mercury lamp, produced 1H-azepine-2,7-dione (20), while under irradiation using a low pressure lamp, 6H-furazano 4,5-c carbazole-3-oxide (21) and compound 20 were obtained. Then the photoproduct 20 produced photodimer 22 by irradiation in acetonitrile: water (9:1, v/v) using a high or low pressure mercury lamp, while photolysis with alkali proceeded as in the photoreaction of N-alkylimide to give 7-hydroxy-1H-azepine-2-one (23). When pyrido 2,3-c furoxan (24) was irradiated in acetonitrile containing a little water with a low pressure mercury lamp, 3-nitro-2-pyridone (25) was obtained. When compound 24 was irradiated in the presence of morpholine with a low pressure mercury lamp in an argon atmosphere, 6-morpholinopyridine 2,3-dioxime (26) was produced. Quinoxaline 1,4-dioxyde derivatives (31, 33), phenazine 5, 10-dioxide derivatives (36, 37) and pyrido 2,3-b pyrazine derivatives (38, 39) were synthesized from the corresponding furoxan catalyzed by silica gel or molecular sieves, and their antibacterial properties were evaluated. The results of antibacterial screening tests in vitro, revealed strong activity against Bacteroides fragilis.
Novel quinoxaline 1, 4-dioxide derivatives were synthesized from benzofuroxans and the enolic form of 1, 3-diketones or 3-oxoalkanoic esters or 3-oxoalkanamides or butanedioic esters catalyzed by ...silica gel or molecular sieves and their antibacterial activities were evaluated. As the results of antibacterial screening tests in vitro, quinoxaline 1, 4-dioxides revealed strong activities against Bacteroides fragilis.
Novel pyrido2, 3-bpyrazine 1, 4-dioxide and pyrido2, 3-bpyrazine 1-oxide derivatives were synthesized from furazano4, 5-bpyridine 3-oxide and the enolic form of 1, 3-diketones or β-ketoesters ...catalyzed by silica gel or molecular sieves. Their antibacterial activities were evaluated. As the results of antibacterial screening tests in vitro, pyrido2, 3-bpyrazine 1, 4-dioxide derivatives revealed strong activities, but pyrido2, 3-bpyrazine 1-oxide derivatives revealed no activities.
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