• English
  • 简体中文
Login Register
Current Location: Home > Feedback Help Print

【结 构 式】

【分子编号】57404

【品名】2-(1,6,7,8-tetrahydro-2H-indeno[5,4-b]furan-8-yl)-1-ethanamine; 2-(1,6,7,8-tetrahydro-2H-indeno[5,4-b]furan-8-yl)ethylamine

【CA登记号】

【 分 子 式 】C13H17NO

【 分 子 量 】203.28412

【元素组成】C 76.81% H 8.43% N 6.89% O 7.87%

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:(XVIII)

The reaction of 2,3-dihydrobenzofuran (I) with dichloromethyl methyl ether (II) by means of TiCl4 in dichloromethane gives 2,3-dihydrobenzofuran-5-carbaldehyde (III), which is condensed with the phosphonate (IV) by means of NaH in THF to yield the propenoic ester (V). The reduction of (V) with H2 over Pd/C in ethanol affords the saturated propionic ester (VI), which is brominated with Br2 in HOAc providing the 7-bromo derivative (VII). Further bromination of (VII) with Br2 and Fe in HOAc gives the 6,7-dibromo derivative (VIII), which is hydrolyzed with NaOH in THF/water to yield the propionic acid derivative (IX). The reaction of (IX) with hot SOCl2 affords the corresponding acyl chloride (X), which is cyclized by means of AlCl3 in dichloroethane to provide 4,5-dibromo-2,6,7,8-tetrahydro-1H-indeno[5,4-b]furan-8-one (XI). The debromination of (XI) by means of H2 over Pd/C in Ac-OH gives 2,6,7,8-tetrahydro-1H-indeno[5,4-b]furan-8-one (XII), which is condensed with the phosphorane (XIII) by means of NaH in THF to yield 2-(2,6,7,8-tetrahydro-1H-indeno[5,4-b]furan-8-ylidene)acetonitrile (XIV). The selective reduction of the cyano group of (XIV) by means of H2 over Raney cobalt in ethanol/NH3 affords 2-(2,6,7,8-tetrahydro-1H-indeno[5,4-b]furan-8-ylidene)ethylamine (XV), which is condensed with propionyl chloride (XVI) by means of TEA in THF to provide the propionamide (XVII). Finally this compound is enantioselectively reduced with H2 over a chiral Ru catalyst (Ru(OAc)2-(S)-BINAP) in methanol to give rise to the target (S)-enantiomer. Alternatively, the reduction of 2-(2,6,7,8-tetrahydro-1H-indeno[5,4-b]furan-8-ylidene)acetonitrile (XIV) with H2 over RaNi in ethanol/NH3 gives 2-(2,6,7,8-tetrahydro-1H-indeno[5,4-b]furan-8-yl)ethylamine (XVIII), which is acylated with propionyl chloride (XVI) and TEA in DMF to yield the racemic propionamide (XIX). Finally this compound is submitted to optical resolution by means of chiral HPLC to afford the target (S)-enantiomer.

1 Chilman-Blair, K.; Castaner, J.; Silvestre, J.S.; Bayes, M.; TAK-375. Drugs Fut 2003, 28, 10, 950.
2 Ohkawa, S.; Uchikawa, O.; Fukatsu, K.; Miyamoto, M. (Takeda Chemical Industries, Ltd.); Tricyclic cpds., their production and use. EP 0885210; JP 1998287665; JP 1999152281; WO 9732871 .
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) 14499 2,3-Dihydrobenzofuran; 2,3-dihydro-1-benzofuran 496-16-2 C8H8O 详情 详情
(II) 40668 dichloro(methoxy)methane; dichloromethyl methyl ether 4885-02-3 C2H4Cl2O 详情 详情
(III) 52198 2,3-Dihydrobenzo[b]furan-5-carboxaldehyde C9H8O2 详情 详情
(IV) 10019 Ethyl 2-(diethoxyphosphoryl)acetate; Triethyl phosphonoacetate 867-13-0 C8H17O5P 详情 详情
(V) 57393 ethyl (E)-3-(2,3-dihydro-1-benzofuran-5-yl)-2-propenoate C13H14O3 详情 详情
(VI) 57394 ethyl 3-(2,3-dihydro-1-benzofuran-5-yl)propanoate C13H16O3 详情 详情
(VII) 57395 ethyl 3-(7-bromo-2,3-dihydro-1-benzofuran-5-yl)propanoate C13H15BrO3 详情 详情
(VIII) 57396 ethyl 3-(6,7-dibromo-2,3-dihydro-1-benzofuran-5-yl)propanoate C13H14Br2O3 详情 详情
(IX) 57397 3-(6,7-dibromo-2,3-dihydro-1-benzofuran-5-yl)propanoic acid C11H10Br2O3 详情 详情
(X) 57398 3-(6,7-dibromo-2,3-dihydro-1-benzofuran-5-yl)propanoyl chloride C11H9Br2ClO2 详情 详情
(XI) 57399 4,5-dibromo-1,2,6,7-tetrahydro-8H-indeno[5,4-b]furan-8-one C11H8Br2O2 详情 详情
(XII) 57400 1,2,6,7-tetrahydro-8H-indeno[5,4-b]furan-8-one C11H10O2 详情 详情
(XIII) 10045 Diethyl cyanomethylphosphonate 2537-48-6 C6H12NO3P 详情 详情
(XIV) 57401 2-(1,2,6,7-tetrahydro-8H-indeno[5,4-b]furan-8-ylidene)acetonitrile C13H11NO 详情 详情
(XV) 57402 2-(1,2,6,7-tetrahydro-8H-indeno[5,4-b]furan-8-ylidene)-1-ethanamine; 2-(1,2,6,7-tetrahydro-8H-indeno[5,4-b]furan-8-ylidene)ethylamine C13H15NO 详情 详情
(XVI) 15967 propanoyl chloride; propionyl chloride 79-03-8 C3H5ClO 详情 详情
(XVII) 57403 N-[2-(1,2,6,7-tetrahydro-8H-indeno[5,4-b]furan-8-ylidene)ethyl]propanamide C16H19NO2 详情 详情
(XVIII) 57404 2-(1,6,7,8-tetrahydro-2H-indeno[5,4-b]furan-8-yl)-1-ethanamine; 2-(1,6,7,8-tetrahydro-2H-indeno[5,4-b]furan-8-yl)ethylamine C13H17NO 详情 详情
(XIX) 57405 N-[2-(1,6,7,8-tetrahydro-2H-indeno[5,4-b]furan-8-yl)ethyl]propanamide C16H21NO2 详情 详情
Extended Information