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【结 构 式】

【药物名称】Bemoradan, RWJ-22867, Orf-22867

【化学名称】(±)-5-Methyl-6-(3-oxo-3,4-dihydro-2H-1,4-benzoxazin-7-yl)-2,3,4,5-tetrahydropyridazin-3-one
      (±)-7-(1,4,5,6-Tetrahydro-4-methyl-6-oxo-3-pyridazinyl)-2H-1,4-benzoxazin-3(4H)-one

【CA登记号】123169-88-0, 112018-01-6 (undefined stereoch.)

【 分 子 式 】C13H13N3O3

【 分 子 量 】259.26686

【开发单位】Ortho-McNeil (Originator)

【药理作用】CARDIOVASCULAR DRUGS, Heart Failure Therapy, Phosphodiesterase III Inhibitors

合成路线1

The acylation of benzoxazolin-2-one (I) with propionic anhydride (II) by means of P2O5 and MsOH gives 6-propionylbenzoxazolin-2-one (III), which is treated with chloroacetyl chloride to yield 7-propionyl-3,4-dihydro-2H-1,4-benzoxazin-3-one (IV). The Mannich condensation of (IV) with CH2O and NH3 followed by methylation with methyl iodide affords the trimethylammonium compound (V), which by reaction with KCN, followed by hydrolysis with HCl gives 3-(3-oxo-3,4-dihydro-2H-1,4-benzoxazin-7-ylcarbonyl)butyric acid (VI). Finally this compound is cyclized with hydrazine to furnish the target pyridazinone.

1 Bonte, J.P.; Lesier, D.; Lespagnol, C.; et al.; 6-Acyl benzoxazolinones. I. Eur J Med Chem - Chim Ther 1974, 9, 491.
2 Kryvenko, M.; Techer, H.; Lavergne, M.; et al.; Electrophilic substitutions of 2H-1,4-benzoxazine-3-one: Acylation and chlorosulfonation. CR Acad Sci Paris Ser C 1970, 270, 19, 1601.
3 Lesier, D.; Lespagnol, C.; Bonte, J.P.; et al.; 6-Acyl benzoxazolinones. II. Preparation of some transformation products. Eur J Med Chem - Chim Ther 1974, 9, 497-500.
4 Thyes, M.; Lehmann, H.D.; Gries, J.; et al.; 6-Aryl-4,5-dihydro-3(2H)-pyridazinones. A new class of compounds with platelet aggregation inhibiting and hypotensive activities. J Med Chem 1983, 26, 6, 800.
5 Moussavi, Z.; Lesieur, D.; Depreux, P.; An aternative synthesis of cardiotonic 6-(3,4-dihydro-3-oxo-1,4[2H]benzoxazin-7-yl)-2,3,4,5-tetrahydro-5-methylpyridazin-3-ones. Synth Commun 1991, 21, 2, 271.
6 Combs, D.W.; Bemoradan and related pyridazinone cardiotonics. Drugs Fut 1993, 18, 2, 139.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(A) 11296 2-Chloroacetyl chloride; Chloroacetic chloride 79-04-9 C2H2Cl2O 详情 详情
(I) 41299 2-Benzoxazolinone; 2(3H)-benzoxazolone; 1,3-benzoxazol-2(3H)-one 59-49-4 C7H5NO2 详情 详情
(II) 20095 propionic anhydride 123-62-6 C6H10O3 详情 详情
(III) 41300 6-propionyl-1,3-benzoxazol-2(3H)-one C10H9NO3 详情 详情
(IV) 41301 7-propionyl-2H-1,4-benzoxazin-3(4H)-one C11H11NO3 详情 详情
(V) 41302 N,N,N,2-tetramethyl-3-oxo-3-(3-oxo-3,4-dihydro-2H-1,4-benzoxazin-7-yl)-1-propanaminium C15H21N2O3 详情 详情
(VI) 41303 3-methyl-4-oxo-4-(3-oxo-3,4-dihydro-2H-1,4-benzoxazin-7-yl)butyric acid C13H13NO5 详情 详情
Extended Information