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【结 构 式】

【分子编号】31930

【品名】(E)-3-(4-bromo-3,5-dimethoxyphenyl)-2-(methoxymethyl)-2-propenenitrile

【CA登记号】

【 分 子 式 】C13H14BrNO3

【 分 子 量 】312.1631

【元素组成】C 50.02% H 4.52% Br 25.6% N 4.49% O 15.38%

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:(VII)

The reaction of dimethyl 2,6-dimethoxyterphthalate (I) with hydroxylamine by means of polyphosphoric acid at 70 C gives methyl 4-(N-hydroxycarbamoyl)-3,5-dimethoxybenzoate (II), which by further reaction with PPA is converted into methyl 4-amino-3,5-dimethoxybenzoate (III). The reaction of (III) with NaNO2 and HBr affords the corresponding diazonium salt, which without isolation is treated with CuBr yielding methyl-4-bromo-3,5-dimethoxybenzoate (IV). The reduction of (IV) with diisobutylaluminum hydride in THF gives 4-bromo-3,5-dimethoxybenzaldehyde (V), which is condensed with 3-methoxypropionitrile (VI) by means of sodium methoxide in refluxing methanol to yield 4-bromo-3,5-dimethoxy-alpha-(methoxymethyl)cinnamic acid nitrile (VII). Finally, this compound is cyclized with guanidine (A) by means of sodium methoxide in hot methanol DMSO. 2) The hydrolysis of (IV) with KOH in ethanol gives 4-bromo-3,5-dimethoxybenzoic acid (VIII), which is treated with SOCl2 in refluxing benzene - DMF to afford 4-bromo-3,5-dimethoxybenzoylchloride (IX). Then the reduction of (IX) with H2 over Pd/BaSO4 in xylene yields (V), already obtained.

1 Kompis, I. (F. Hoffmann-La Roche AG); Benzylpyirimidine derivates. CA 1017743; DE 2452889; FR 2250533; GB 1449387; JP 50077378; NL 7414528 .
2 Sweetman, A.J.; Serradell, M.N.; Castaner, J.; Blancafort, P.; Brodimoprim. Drugs Fut 1982, 7, 2, 93.
3 Kompis, I.; Wick, A.; Synthesis of 4-halo-substituted analogs of trimethropin. Helv Chim Acta 1977, 60, 8, 3025-34.
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) 14790 Guanidine 113-00-8 CH5N3 详情 详情
(I) 31924 Methyl 4-(acetoxy)-3,5-dimethoxybenzoate; Dimethyl 2,6-dimethoxyterephthalate 16849-68-6 C12H14O6 详情 详情
(II) 31925 Methyl 4-(N-hydroxycarbamoyl)-3,5-dimethoxybenzoate; Methyl 4-[(hydroxyamino)carbonyl]-3,5-dimethoxybenzoate C11H13NO6 详情 详情
(III) 31926 Methyl 4-amino-3,5-dimethoxybenzoate C10H13NO4 详情 详情
(IV) 31927 Methyl 4-bromo-3,5-dimethoxybenzoate C10H11BrO4 详情 详情
(V) 31928 4-Bromo-3,5-dimethoxybenzaldehyde C9H9BrO3 详情 详情
(VI) 31929 3-Methoxypropanenitrile; 3-Methoxypropionitrile 110-67-8 C4H7NO 详情 详情
(VII) 31930 (E)-3-(4-bromo-3,5-dimethoxyphenyl)-2-(methoxymethyl)-2-propenenitrile C13H14BrNO3 详情 详情
(VIII) 31931 4-bromo-3,5-dimethoxybenzoic acid C9H9BrO4 详情 详情
(IX) 31932 4-bromo-3,5-dimethoxybenzoyl chloride C9H8BrClO3 详情 详情
Extended Information