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【结 构 式】

【分子编号】14502

【品名】5-(2-bromoethyl)-2,3-dihydro-1-benzofuran

【CA登记号】

【 分 子 式 】C10H11BrO

【 分 子 量 】227.10074

【元素组成】C 52.89% H 4.88% Br 35.18% O 7.05%

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:(XIV)

Darifenacin can be obtained by three related ways: 1) The decarboxylation of (2S,4R)-4-hydroxypyrrolidine-2-carboxylic acid (I) by heating at 154 C in cyclohexanol/2-cyclohexenone gives 3(R)-hydroxypyrrolidine (II), which is N-tosylated with p-toluenesulfonyl chloride and pyridine yielding (III). The reaction of (III) with methyl p-toluenesulfonate, triphenylphosphine and diethyl azodicarboxylate (DEAD) in THF affords 1-tosyl-3(S)-(tosyloxy)pyrrolidine (IV), which is condensed with 2,2-diphenylacetonitrile (V) by means of NaH in refluxing toluene to give 2,2-diphenyl-2-[1-(p-toluenesulfonyloxy)pyrrolidin-2(S)-yl]acetonitrile (VI). Elimination of the tosyl group of (VI) with HBr and phenol in refluxing water yields 2,2-diphenyl-2-[2(S)-pyrrolidinyl]acetonitrile (VII), which by treatment with 95% H2SO4 at 100 C is converted into the corresponding acetamide (VIII). The condensation of (VIII) with 5-(chloroacetyl)-2,3-dihydrobenzofuran (IX) by means of potassium carbonate in industrial methylated spirits affords the ketonic amide (X), which is finally reduced with H2 over Pd/C in acetic acid. The intermediate 5-(chloroacetyl)-2,3-dihydrobenzofuran (IX) has been obtained by Friedel-Crafts condensation of 2,3-dihydrobenzofuran (XI) with chloroacetyl chloride by means of AlCl3 in dichloromethane. 3) The condensation of 5-(2-bromoethyl)benzofuran (XV), with the previously obtained acetamide (VIII) by means of K2CO3 in refluxing acetonitrile affords the condensation product (XVI), which is hydrogenated with H2 over Pd/C in hot acetic acid.

1 Graul, A.; Castaner, J.; Darifenacin. Drugs Fut 1996, 21, 11, 1105.
2 Cross, P.E.; Mackenzie, A.R. (Pfizer Inc.); Pyrrolidine derivs. AU 9051402; EP 0388054; JP 1990282360; JP 1995149640; US 5096890 .
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) 14489 (2S,4R)-4-hydroxytetrahydro-1H-pyrrole-2-carboxylic acid; L-Hydroxyproline 51-35-4 C5H9NO3 详情 详情
(II) 14490 (3R)tetrahydro-1H-pyrrol-3-ol; R-3-hydroxypyrrolidine 2799-21-5 C4H9NO 详情 详情
(III) 14491 (3R)-1-[(4-methylphenyl)sulfonyl]tetrahydro-1H-pyrrol-3-ol C11H15NO3S 详情 详情
(IV) 14492 (3S)-1-[(4-methylphenyl)sulfonyl]tetrahydro-1H-pyrrol-3-yl 4-methylbenzenesulfonate C18H21NO5S2 详情 详情
(V) 14493 alpha-phenylbenzeneacetonitrile; 2,2-diphenylacetonitrile; Diphenylacetonitrile 86-29-3 C14H11N 详情 详情
(VI) 14494 2-[(3S)-1-[(4-methylphenyl)sulfonyl]tetrahydro-1H-pyrrol-3-yl]-2,2-diphenylacetonitrile C25H24N2O2S 详情 详情
(VII) 14495 2,2-diphenyl-2-[(3S)tetrahydro-1H-pyrrol-3-yl]acetonitrile C18H18N2 详情 详情
(VIII) 14496 2,2-diphenyl-2-[(3S)tetrahydro-1H-pyrrol-3-yl]acetamide C18H20N2O 详情 详情
(IX) 14497 2-chloro-1-(2,3-dihydro-1-benzofuran-5-yl)-1-ethanone C10H9ClO2 详情 详情
(X) 14498 2-[(3S)-1-[2-(2,3-dihydro-1-benzofuran-5-yl)-2-oxoethyl]tetrahydro-1H-pyrrol-3-yl]-2,2-diphenylacetamide C28H28N2O3 详情 详情
(XI) 14499 2,3-Dihydrobenzofuran; 2,3-dihydro-1-benzofuran 496-16-2 C8H8O 详情 详情
(XII) 14500 2-(2,3-dihydro-1-benzofuran-5-yl)acetic acid 69999-16-2 C10H10O3 详情 详情
(XIII) 14501 2-(2,3-dihydro-1-benzofuran-5-yl)-1-ethanol C10H12O2 详情 详情
(XIV) 14502 5-(2-bromoethyl)-2,3-dihydro-1-benzofuran C10H11BrO 详情 详情
(XV) 14503 5-(2-bromoethyl)-1-benzofuran C10H9BrO 详情 详情
(XVI) 14504 2-[(3S)-1-[2-(1-benzofuran-5-yl)ethyl]tetrahydro-1H-pyrrol-3-yl]-2,2-diphenylacetamide C28H28N2O2 详情 详情
Extended Information