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【结 构 式】

【分子编号】33214

【品名】3-(cyclopentyloxy)-4-methoxybenzoic acid

【CA登记号】

【 分 子 式 】C13H16O4

【 分 子 量 】236.26764

【元素组成】C 66.09% H 6.83% O 27.09%

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:(IV)

The alkylation of isovanillin (I) with cyclopentyl bromide (II) by means of K2CO3 in refluxing ethanol (or hot DMF) gives the 4-cyclopentyloxy-3-methoxybenzaldehyde (III), which is oxidized with H2O2 and NaOH (or NaClO2 in AcOH/water) yielding the carboxylic acid (IV). The reaction of (IV) with SOCl2 and DMF in refluxing toluene affords the acyl chloride (V), which is finally condensed with 3,5-dichloropyridine-4-amine (VI) by means of potassium tert-butoxide in toluene or NaH in THF or by heating at the melting point. The intermediate 3,5-dichloropyridine-4-amine (VI) is obtained by chlorination of pyridine-4-amine (VII) with HCl and H2O2 at 70 C.

1 Ashton, M.J.; Cook, D.C.; Fenton, G.; Hills, S.J.; Mcfarlane, I.M.; Palfreyman, M.N.; Ratcliffe, A.J.; Vicker, N. (Aventis Pharma SA); Benzamides. EP 0497564; EP 0569414; JP 1994504782; WO 9212961 .
2 Cook, D.C.; Walton, J.B.; Pemberton, C.; Jones, R.H.; McFarlane, I.M.; Thompson, D.M.; Thatcher, A.A.; Kabir, H.; Lythgoe, D.J.; Process development of the PDE IV inhibitor 3-(cyclopentyloxy)-N-(3,5-dichloropyrid-4-yl)-4-methoxybenzamide. Org Process Res Dev 1998, 2, 3, 157.
3 Ashton, M.J.; et al.; Selective type IV phosphodiesterase inhibitors as antiasthmatic agents. The syntheses and biological activities of 3-(cyclopentyloxy)-4-methoxybenzamides and analogues. J Med Chem 1994, 37, 11, 1696.
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) 18455 3-hydroxy-4-methoxybenzaldehyde; Isovanillin 621-59-0 C8H8O3 详情 详情
(II) 10972 1-Bromocyclopentane; Cyclopentyl bromide 137-43-9 C5H9Br 详情 详情
(III) 16510 3-(cyclopentyloxy)-4-methoxybenzaldehyde C13H16O3 详情 详情
(IV) 33214 3-(cyclopentyloxy)-4-methoxybenzoic acid C13H16O4 详情 详情
(V) 33213 3-(cyclopentyloxy)benzoyl chloride C12H13ClO2 详情 详情
(VI) 25135 3,5-dichloro-4-pyridinamine; 4-amino-3,5-dichloropyridine 22889-78-7 C5H4Cl2N2 详情 详情
(VII) 25661 4-pyridinamine; 4-aminopyridine 5044-74-5 C5H6N2 详情 详情
Extended Information