工地图纸字母代表什么:甲硝唑 [CAS:443-48-1]合成路线图解??有机化学网
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药物详细合成路线
Chemical Name: 2-Methyl-5-nitro-1H-imidazole-1-ethanol Generic Name: 甲硝唑;Metronidazole Other Names: Metronidazole;IDR-90105(Ophthalmic);Rosased;Zidoval;Metrogel;Flagyl CAS: 443-48-1 Related CAS: 133884-00-1 (deleted CAS) Formula: C6H9N3O3 Mole Weight: 171.15693 structure: Company: Pfizer (Originator), 3M Pharmaceuticals (Not Determined), Novartis (Not Determined), Pierre Fabre (Not Determined), Institute for Drug Research (Licensee) Usage: Acne Therapy, Antiamebics, Antibacterial Drugs, Antibacterial Ophthalmic Drugs, Antifungal Agents, ANTIINFECTIVE THERAPY, Antitrichomonals, DERMATOLOGIC DRUGS, Ocular Antiinflammatory and Antiinfective Agents, OCULAR MEDICATIONS, Ophthalmic Drugs, Treatment of Protozoal Diseases Route 1 2-Methylimidazole (I) is converted into the bisulfate salt, and then nitrated by means of a sulfonitric mixture in Ac2O to produce 2-methyl-4-nitroimidazole (II) . In a variant of this procedure, 2-methylimidazole (I) is nitrated by using a ferric nitrate-tonsyl adduct in several solvents. Imidazole (II) is then regioselectively alkylated with boiling 2-chloroethanol to produce the title compound. Alternatively, the alkylation of (II) has been reported by treatment with ethylene oxide (III) under acidic conditions.Route 2 In an alternative procedure, the title compound is obtained by hydrolysis of the bromoethyl imidazole (I) in the presence of formic acid in aqueous formamide
Route 3 The title compound can be obtained by reaction of 1-(acetoxymethyl)-2-methyl-4-nitroimidazole (I) with ethylene oxide (II) in the presence of sulfur trioxide, followed by hydrolysis in aqueous H2SO4
Route 4 In a related procedure, 1-(acetoxymethyl)-2-methyl-4-nitroimidazole (I) is condensed with ethyleneglycol diacetate (II) in the presence of anhydrous H2SO4, followed by hydrolysis or alcoholysis under acidic conditions to produce the title compound
Route 5 Alternatively, 2-methyl-4-nitroimidazole (I) is protected by acylation in hot acetic anhydride to give (II). Addition of ethylene oxide (III) to the N-acetyl imidazole (II) in the presence of SO3, followed by acidic hydrolysis furnishes the title compound
Route 6 The title compound can also be obtained by alkylation, in different solvents, of 1-(acetoxymethyl)-2-methyl-4-nitroimidazole (I) with either ethylene sulfate (II) or with bis-(2-acetoxyethyl) sulfate (III) -generated from ethyleneglycol diacetate (IV) and either dimethyl sulfate or H2SO4 - followed by hydrolysis or alcoholysis treatment