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- W1552850203 abstract "The treatment of 6-(benzylidene-1'-methylhydrazino)-3-methyl-5-nitrouracil (I) with sulfuric acid in acetic acid gave a mixture of 1, 6-dimethyl-5, 7-dioxo-8-nitro-3-phenyl-1, 5, 6, 7-tetrahydro-s-triazolo [4, 3-c] pyrimidine (III) and 1, 5-dimethyl-3-phenylpyrazolo-[3, 4-d] pyrimidine-4, 6 (5H, 7H) dione. The reaction in the presence of potassium nitrate under the same conditions gave exclusively III. The reaction of 6-(benzylidene-1'-methylhydrazino)-3-methyluracil with potassium nitrate in acetic acid in the presence of sulfuric acid gave a mixture of 3-phenyltoxoflavin and 3-phenyl-1-demethyltoxoflavin. The treatment of 6-benzylidenehydrazino-3-methyl-5-nitrouracil with potassium nitrate in acetic acid (with or without sulfuric acid) gave 5, 7-dioxo-6-methyl-8-nitro-3-phenyl-1, 5, 6, 7-tetrahydro-s-triazolo [4, 3-c] pyrimidine. The treatment of 6-benzylidenehydrazino-3-methyluracil with sodium nitrite in acetic acid at low temperature gave the corresponding 5-nitroso derivative, which was converted into 3, 6-dimethyl-2, 4, 5, 7 (1H, 3H, 6H, 8H)-pyrimido [5, 4-g] pteridinetetrone by treatment with a mixture of acetic acid and sulfuric acid." @default.
- W1552850203 created "2016-06-24" @default.
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- W1552850203 date "1975-01-01" @default.
- W1552850203 modified "2023-09-23" @default.
- W1552850203 title "Cyclization reactions of some 5-nitro- and 5-nitroso-6- benzylidenehydraziouracils." @default.
- W1552850203 doi "https://doi.org/10.1248/cpb.23.1885" @default.
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