反应详情

The 5-nitrosouracil derivative may be obtained by the nitrosylation of the aminouracil A or B using standard nitration reagents. Examples of such agents include, for example, NaNO2/AcOH, HNO3/H2SO4, N2O5/P2O5/CCl4, HONO, EtONO2, CH3COONO2 and NO2+CF3SO3− that forms the nitro or the nitrosouracil derivative. Thus, the aminouracil may be dissolved in an aqueous acid, such as acetic acid and water below room temperature, such as about 10° C., and NaNO2 in water is added to the aminouracil. When the reaction is deemed complete, the volatiles are removed under reduced pressure and the residue is redissolved in a mixture of solvents. Example of such mixtures of solvents include alcohols in an organic solvent, such as absolute ethanol in DCM. The resulting mixture is heated and the hot mixture may be filtered through a filter aid such as Celite 545 to remove insoluble inorganic salts. The solvent or solvent mixtures may evaporated under reduced pressure to afford the desired 5-nitrouracil or 5-nitrosouracil.

1. customthe volatiles are removed under reduced pressure
2. dissolutionthe residue is redissolved in a mixture of solvents
3. temperatureThe resulting mixture is heated
4. filtrationthe hot mixture may be filtered through a filter aid such as Celite 545
5. customto remove insoluble inorganic salts
6. customThe solvent or solvent mixtures may evaporated under reduced pressure