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【结 构 式】

【分子编号】46409

【品名】2-amino-3-nitrobenzoic acid

【CA登记号】

【 分 子 式 】C7H6N2O4

【 分 子 量 】182.13572

【元素组成】C 46.16% H 3.32% N 15.38% O 35.14%

与该中间体有关的原料药合成路线共 1 条

合成路线1

该中间体在本合成路线中的序号:(III)

Regioselective ring opening of 3-nitrophthalic anhydride (I) with ammonia yielded amide (II), which was subjected to a Hofmann degradation with Br2 and KOH to afford 3-nitroanthranilic acid (III). Esterification of (III) to ster (IV) using MeOH/HCl, followed by reduction of the nitro group by catalytic hydrogenation, gave methyl 2,3-diaminobenzoate (V). Alternatively, diamino ester (V) was prepared by reduction of nitro acid (III), followed by catalytic esterification. Methyl 2,3-diaminobenzoate (V) was then selectively acylated at the 3-amino group with 4-methoxybenzoyl chloride (VI) producing amide (VII), which was cyclized to the benzimidazole (VIII) upon refluxing in HOAc. The corresponding amide (IX) was obtained by reaction of ester (VIII) with liquid ammonia at 100 C in a pressure vessel. Finally, the methyl ether group of (IX) was cleaved to the title phenol by treatment with boron tribromide.

1 Wood, M.D.; Taylor, S.G.; Reavill, C.; et al.; Pharmacological actions of a novel, high-affinity, and selective human dopamine D3 receptor antagonist, SB-277011-A. J Pharmacol Exp Ther 2000, 294, 3, 1154.
2 Griffin, R.J.; Calvert, A.H.; Newell, D.R.; Curtain, J.N.; Golding, B.T. (University of Newcastle upon Tyne); Benzimidazole cpds.. US 6100283 .
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) 46407 4-nitro-2-benzofuran-1,3-dione;3-nitrophthalic anhydride 641-70-3 C8H3NO5 详情 详情
(II) 46408 2-(aminocarbonyl)-3-nitrobenzoic acid C8H6N2O5 详情 详情
(III) 46409 2-amino-3-nitrobenzoic acid C7H6N2O4 详情 详情
(IV) 46410 methyl 2-amino-3-nitrobenzoate C8H8N2O4 详情 详情
(V) 18889 methyl 2,3-diaminobenzoate C8H10N2O2 详情 详情
(VI) 22671 4-Methoxybenzoyl chloride; p-Methoxybenzoyl chloride; 4-Anisoyl chloride 100-07-2 C8H7ClO2 详情 详情
(VII) 46411 methyl 2-amino-3-[(4-methoxybenzoyl)amino]benzoate C16H16N2O4 详情 详情
(VIII) 46412 methyl 2-(4-methoxyphenyl)-1H-benzimidazole-4-carboxylate C16H14N2O3 详情 详情
(IX) 46413 2-(4-methoxyphenyl)-1H-benzimidazole-4-carboxamide C15H13N3O2 详情 详情
Extended Information