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【结 构 式】

【分子编号】36359

【品名】tetrahydro-2,5-furandiol

【CA登记号】

【 分 子 式 】C4H8O3

【 分 子 量 】104.10572

【元素组成】C 46.15% H 7.75% O 46.11%

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:(IX)

The reaction of 5-chloro-2-hydroxybenzoic acid (I) with 2-methyl-2-propenyl chloride (II) by means of K2CO3 and KI in hot DMF gives 5-chloro-2-(2-methyl-2-propenyloxy)benzoic acid 2-methyl-2-propenyl ester (III), which is rearranged by heating at 190 C yielding 5-chloro-2-hydroxy-3-(2-methyl-2-propenyl)benzoic acid 2-methyl-2-propenyl ester (IV). The cyclization of (IV) with refluxing 90% formic acid affords 5-chloro-2,2-dimethyl-2,3-dihydrobenzofuran-7-carboxylic acid (V), which is treated with SOCl2 in DMF and condensed with endo-8-methyl-8-azabicyclo[3.2.1]octan-3-amine (VI). The acid intermediate (V) can also be obtained by hydrolysis of the ester (III) with NaOH and tetrabutylammonium bisulfate in refluxing water to give 5-chloro-2-(2-methyl-2-propenyloxy)benzoic acid (VII), which is rearranged by heating at 170 C yielding 5-chloro-2-hydroxy-3-(2-methyl-2-propenyl)benzoic acid (VIII). Finally, (VIII) is cyclized to acid intermediate (V) by a treatment with aqueous refluxing 2.7N HCl. The intermediate endo-8-methyl-8-azabicyclo[3.2.1]octan-3-amine (VI) has been obtained as follows: 2,5-dihydroxytetrahydrofuran (IX) or 2,5-dimethoxytetra-hydrofuran (X) with HCl give butanedialdehyde (XI), which, without isolation, is cyclized with 3-oxoglutaric acid (XII) and methylamine by means of NaOAc and HCl in hot water yielding 8-methyl-8-azabicyclo[3.2.1]octan-3-one (XIII). The reductocondensation of (XIII) with benzylamine by means of NaBH(OAc)3, followed by hydrogenolysis with H2 over Pd/C in basic water gives directly the amine (VI). The intermediate amine (VI) can also be obtained by condensation of bicyclooctanone (XIII) with benzylamine(A) to give the imine (XIV), which is reduced to the benzylamine (XV) with H2 over PtO2 in ethanol. Finally, this compound is debenzylated by hydrogenation over Pd/C in the same solvent yielding amine (VI).

1 Burks, J.E.; et al.; Development of a manufacturing process for zatosetron maleate. Org Process Res Dev 1997, 1, 3, 198.
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) 15147 Benzylamine; Phenylmethanamine 100-46-9 C7H9N 详情 详情
(I) 13895 5-Chloro-2-hydroxybenzoic acid; 5-Chlorosalicylic acid 321-14-2 C7H5ClO3 详情 详情
(II) 12127 3-Chloro-2-methyl-1-propene; Isobutenyl chloride 563-47-3 C4H7Cl 详情 详情
(III) 36355 2-methyl-2-propenyl 5-chloro-2-[(2-methyl-2-propenyl)oxy]benzoate C15H17ClO3 详情 详情
(IV) 36356 2-methyl-2-propenyl 5-chloro-2-hydroxy-3-(2-methyl-2-propenyl)benzoate C15H17ClO3 详情 详情
(V) 13900 5-Chloro-2,2-dimethyl-2,3-dihydro-1-benzofuran-7-carboxylic acid C11H11ClO3 详情 详情
(VI) 12412 (1R,5S)-8-Methyl-8-azabicyclo[3.2.1]octan-3-amine; (1R,5S)-8-Methyl-8-azabicyclo[3.2.1]oct-3-ylamine C8H16N2 详情 详情
(VII) 36357 5-chloro-2-[(2-methyl-2-propenyl)oxy]benzoic acid C11H11ClO3 详情 详情
(VIII) 36358 5-chloro-2-hydroxy-3-(2-methyl-2-propenyl)benzoic acid C11H11ClO3 详情 详情
(IX) 36359 tetrahydro-2,5-furandiol C4H8O3 详情 详情
(X) 12132 2,5-Dimethoxytetrahydrofuran; 5-Methoxytetrahydro-2-furanyl methyl ether 696-59-3 C6H12O3 详情 详情
(XI) 36360 succinaldehyde C4H6O2 详情 详情
(XII) 15530 1,3-Acetonedicarboxylic Acid; 3-Oxopentanedioic acid;3-oxoglutaric acid 542-05-2 C5H6O5 详情 详情
(XIII) 16443 (1R,5S)-8-methyl-8-azabicyclo[3.2.1]octan-3-one C8H13NO 详情 详情
(XIV) 36361 N-benzyl-N-[(1R,5S)-8-methyl-8-azabicyclo[3.2.1]oct-3-ylidene]amine; N-[(1R,5S)-8-methyl-8-azabicyclo[3.2.1]oct-3-ylidene](phenyl)methanamine C15H20N2 详情 详情
(XV) 12413 N-Benzyl-N-[(1R,5S)-8-methyl-8-azabicyclo[3.2.1]oct-3-yl]amine; (1R,5S)-N-Benzyl-8-methyl-8-azabicyclo[3.2.1]octan-3-amine C15H22N2 详情 详情
Extended Information