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【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
Extended Information