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【结 构 式】 
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【分子编号】17205 【品名】6-ethoxy-1-(4-pyridinyl)-2-benzofuran-5-yl ethyl ether; 4-(5,6-diethoxy-2-benzofuran-1-yl)pyridine 【CA登记号】 |
【 分 子 式 】C17H17NO3 【 分 子 量 】283.32692 【元素组成】C 72.07% H 6.05% N 4.94% O 16.94% |
合成路线1
该中间体在本合成路线中的序号：(IV)The condensation of 2-bromo-4,5-diethoxybenzaldehyde dimethyl ketal (I) with pyridine-4-carbaldehyde (II) by means of NaH in THF gives the expected addition product (III), which by treatment with acetic acid in refluxing toluene yields the isobenzofuran (IV) (unstable, not isolated compound) that is submitted immediately to a Diels-Alder cyclization with dimethyl maleate (V) to afford the epoxy-tetrahydronaphthalene (VI). The aromatization of (VI) with trifluoroacetic acid (TFA) in chloroform, or with BF3/ethyl ether in acetonitrile gives 6,7-diethoxy-1-(4-pyridyl)naphthalene-2,3-dicarboxylic acid dimethyl ester (VII). The oxidation of (VII) with m-chloroperbenzoic acid (MCPBA) in dichloromethane gives the corresponding N-oxide (VIII), which is isomerized to the pyridone (IX) by refluxing in acetic anhydride. The condensation of (IX) with 2-chloroethyl methyl ether (X) by means of NaH or Li in DMF affords the N-substituted pyridone (XI), which is finally reduced with NaBH4 in THF.
| 【1】 Graul, A.; Leeson, P.; Castañer, J.; T-440. Drugs Fut 1997, 22, 7, 729. |
| 【2】 Iwasaki, T.; Kondo, K.; Kuroda, T.; Moritani, Y.; Yamagata, S.; Sugiura, M.; Kikkawa, H.; Kaminuma, O.; Ikezawa, K.; Novel selective PDE IV inhibitors as antiasthmatic agents. Synthesis and biological activities of a series of 1-aryl-2,3-bis(hydroxymethyl)naphthalene lignans. J Med Chem 1996, 39, 14, 2696-704. |
| 【3】 Iwasaki, T.; Kondo, K.; Ikezawa, K.; Kikkawa, H.; Yamagata, S. (Tanabe Seiyaku Co., Ltd.); Naphthalene derivs. processes for preparing the same, and synthetic intermediates thereof. EP 0557016; JP 1993229987; US 5342941 . |
| 【4】 Iwasaki, T.; Kondo, K.; Ikesawa, I.; Yoshikawa, H.; Yamashina, S. (Tanabe Seiyaku Co., Ltd.); Antiasthma agent. JP 1995101861 . |
| 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) | 17202 | (2-bromo-4,5-diethoxyphenyl)(methoxy)methyl methyl ether; 1-bromo-2-(dimethoxymethyl)-4,5-diethoxybenzene | C13H19BrO4 | 详情 | 详情 | |
| (II) | 17203 | 4-Pyridinecarboxaldehyde; isonicotinaldehyde | 872-85-5 | C6H5NO | 详情 | 详情 |
| (III) | 17204 | [6-(dimethoxymethyl)-3,4-diethoxy-2,4-cyclohexadien-1-yl](4-pyridinyl)methanol | C19H27NO5 | 详情 | 详情 | |
| (IV) | 17205 | 6-ethoxy-1-(4-pyridinyl)-2-benzofuran-5-yl ethyl ether; 4-(5,6-diethoxy-2-benzofuran-1-yl)pyridine | C17H17NO3 | 详情 | 详情 | |
| (V) | 17206 | dimethyl (Z)-2-butenedioate; Dimethyl Maleate | 23055-10-9 | C6H8O4 | 详情 | 详情 |
| (VI) | 17207 | dimethyl 4,5-diethoxy-1-(4-pyridinyl)-11-oxatricyclo[6.2.1.0(2,7)]undeca-2,4,6-triene-9,10-dicarboxylate | C23H25NO7 | 详情 | 详情 | |
| (VII) | 17208 | dimethyl 6,7-diethoxy-1-(4-pyridinyl)-2,3-naphthalenedicarboxylate | C23H23NO6 | 详情 | 详情 | |
| (VIII) | 17209 | 4-[6,7-diethoxy-2,3-bis(methoxycarbonyl)-1-naphthyl]-1-pyridiniumolate | C23H23NO7 | 详情 | 详情 | |
| (IX) | 17210 | dimethyl 6,7-diethoxy-1-(2-oxo-1,2-dihydro-4-pyridinyl)-2,3-naphthalenedicarboxylate | C23H23NO7 | 详情 | 详情 | |
| (X) | 17211 | 1-Chloro-2-methoxyethane; 2-Chloroethyl methyl ether | 627-42-9 | C3H7ClO | 详情 | 详情 |
| (XI) | 17212 | dimethyl 6,7-diethoxy-1-[1-(2-methoxyethyl)-2-oxo-1,2-dihydro-4-pyridinyl]-2,3-naphthalenedicarboxylate | C26H29NO8 | 详情 | 详情 |