【结 构 式】 |
【药物名称】Medetomidine, MPV-785(hydrochloride), Domitor 【化学名称】(±)-4-[1-(2,3-Dimethylphenyl)ethyl]imidazole 【CA登记号】86347-14-0, 86347-15-1 (HCl) 【 分 子 式 】C13H16N2 【 分 子 量 】200.28587 |
【开发单位】Orion Corp. (Originator), Orion Pharma (Originator) 【药理作用】ANALGESIC AND ANESTHETIC DRUGS, Analgesic Drugs, Antiglaucoma Agents, Anxiolytics, CARDIOVASCULAR DRUGS, Hypertension, Treatment of, Non-Opioid Analgesics, OCULAR MEDICATIONS, Ophthalmic Drugs, PSYCHOPHARMACOLOGIC DRUGS, Sedative/Hypnotics, Sleep Disorders, Treatment of |
合成路线1
A new synthesis for medetomidine has been reported: The silylation of N,N-dimethylimidazole-1-sulfonamide (I) with tert-butyldimethylsilyl chloride and butyllithium in THF gives the 2-silyl derivative (II), which is acylated with 2,3-dimethylbenzoyl chloride (III) by means of butyllithium in THF, yielding 2-(tert-butyldimethylsilyl)-5-(2,3-dimethylbenzoyl)-N,N-dimethylimidazo le-1-sulfonamide (IV). Hydrolysis of (IV) with refluxing aqueous HCl affords 5-(2,3-dimethylbenzoyl)imidazole (V), which is finally methylated with methyllithium in THF and reduced with Li in liquid NH3.
【1】 Turnbull, S.P.; Kudzma, L.V.; Expedient synthesis of 4(5)-[1-(2,3-dimethylphenyl)ethyl]-1H-imidazole, the alpha2-adrenergic agonist medetomidine. Synthesis 1991, 11, 1201. |
中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
---|---|---|---|---|---|---|
(I) | 11036 | N,N-Dimethyl-1H-imidazole-1-sulfonamide | 78162-58-0 | C5H9N3O2S | 详情 | 详情 |
(II) | 11037 | 2-[tert-Butyl(dimethyl)silyl]-N,N-dimethyl-1H-imidazole-1-sulfonamide | C11H23N3O2SSi | 详情 | 详情 | |
(III) | 11038 | 2,3-Dimethylbenzoyl chloride | 21900-46-9 | C9H9ClO | 详情 | 详情 |
(IV) | 11039 | 2-[tert-Butyl(dimethyl)silyl]-5-(2,3-dimethylbenzoyl)-N,N-dimethyl-1H-imidazole-1-sulfonamide | C20H31N3O3SSi | 详情 | 详情 | |
(V) | 11040 | (2,3-Dimethylphenyl)(1H-imidazol-4-yl)methanone | C12H12N2O | 详情 | 详情 |
合成路线2
The Grignard condensation of methyl imidazole-4-carboxyate (I) with 2,3-dimethylphenylmagnesium bromide (II) in THF gives 4-(2,3-dimethylbenzoyl) imidazole (III), which (without isolation) is submitted to a new Grignard condensation with methylmagnesium iodide (IV) in the same solvent to yield 1-(4-imidazolyl)-1-(2,3-dimethylphenyl)ethanol (V). The dehydration of (V) with potassium hydrogen sulfate at 136 C affords 1-(4-imidazolyl)-1-(2,3-dimethyl-phenyl)ethylene (VI), which is finally hydrogenated with H2 over Pd/C in 2N HCl.
【1】 Hillier, K.; Acta Univ Oul 1981, 8, 4, A125. |
【2】 Karjalainen, A.J.; Kurkela, K.O.A.; Pohjala, E.K. (Orion Pharma); Antihypertensive subtituted imidazole derivates. GB 2101114; US 4639464 . |
【3】 Castaner, R.M.; Serradell, M.N.; Castaner, J.; Medetomidine. Drugs Fut 1987, 12, 11, 1021. |
中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
---|---|---|---|---|---|---|
(I) | 27998 | methyl 1H-imidazole-4-carboxylate | 17325-26-7 | C5H6N2O2 | 详情 | 详情 |
(II) | 27999 | bromo(2,3-dimethylphenyl)magnesium | C8H9BrMg | 详情 | 详情 | |
(III) | 11040 | (2,3-Dimethylphenyl)(1H-imidazol-4-yl)methanone | C12H12N2O | 详情 | 详情 | |
(IV) | 20225 | iodo(methyl)magnesium | 917-64-6 | CH3IMg | 详情 | 详情 |
(V) | 28000 | 1-(2,3-dimethylphenyl)-1-(1H-imidazol-4-yl)-1-ethanol | C13H16N2O | 详情 | 详情 | |
(VI) | 28001 | 4-[1-(2,3-dimethylphenyl)vinyl]-1H-imidazole | C13H14N2 | 详情 | 详情 |