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【结 构 式】 
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【分子编号】35024 【品名】methyl 3-(4-methylcyclohexyl)-3-oxopropanoate 【CA登记号】 |
【 分 子 式 】C11H18O3 【 分 子 量 】198.26212 【元素组成】C 66.64% H 9.15% O 24.21% |
合成路线1
该中间体在本合成路线中的序号：(III)Condensation of piperonal (I) with nitromethane in the presence of NaOH provided nitrostyrene (II). Subsequent conjugate addition of (II) to ketoester (III) using DBU provided adduct (IV). Reduction of the nitro group of (IV), with concomitant ring closure formed the cyclic imine (V), which was reduced with NaBH3CN to yield the pyrrolidine (VI) as a diastereomeric mixture. The crude mixture was isomerized to a mixture of only cis,trans and trans,trans pyrrolidines (VII) by base-catalyzed equilibration with NaOEt. N-Alkylation of the pyrrolidines (VII) with N,N-dibutyl bromoacetamide (VIII) furnished (IX). Basic hydrolysis of the ester group of (IX) with either NaOH or LiOH gave rise to the target trans,trans pyrrolidine-3-carboxylic acid. The undesired cis,trans isomeric ester (X) was not hydrolyzed under these conditions, allowing its removal from the product by means of differential extraction.
| 【1】 Boyd, S.A.; Mantei, R.A.; Tasker, A.S.; et al.; Discovery of a series of pyrrolidine-based endothelin receptor antagonists with enhanced ETA receptor selectivity. Bioorg Med Chem 1999, 7, 6, 991. |
| 【2】 Winn, M.; Boyd, S.A.; Hutchins, C.W.; Tasker, A.S.; Von Geldern, T.W.; Kester, J.A.; Sorensen, B.K.; Szczepankiewicz, B.G.; Henry, K.J. Jr.; Liu, G.; Wittenberger, S.J.; King, S.A. (Abbott Laboratories Inc.); Novel benzo-1,3-dioxolyl- and benzofuranyl substd. pyrrolidine derivs. as endothelin antagonists. EP 0885215; WO 9730045 . |
| 【3】 Jae, H.-S.; Hutchins, C.W.; Szczepankiewicz, B.G.; King, S.A.; Winn, M.; Boyd, S.A.; Henry, K.J.; Geldern, T.W.; Wittenberger, S.J.; Tasker, A.S.; Sorensen, B.K.; Kester, J.A. (Abbott Laboratories Inc.); Endothelin antagonists. WO 9906397 . |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| 39563 | nitromethane | 75-52-5 | CH3NO2 | 详情 | 详情 | |
| (VIIa) | 35028 | methyl (2S,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-(4-methylcyclohexyl)-3-pyrrolidinecarboxylate | C20H27NO4 | 详情 | 详情 | |
| (VIIb) | 35029 | methyl (2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-(4-methylcyclohexyl)-3-pyrrolidinecarboxylate | C20H27NO4 | 详情 | 详情 | |
| (IXa) | 35030 | methyl (2S,3R,4S)-4-(1,3-benzodioxol-5-yl)-1-[2-(dibutylamino)-2-oxoethyl]-2-(4-methylcyclohexyl)-3-pyrrolidinecarboxylate | C30H46N2O5 | 详情 | 详情 | |
| (IXb),(X) | 35031 | methyl (2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-1-[2-(dibutylamino)-2-oxoethyl]-2-(4-methylcyclohexyl)-3-pyrrolidinecarboxylate | C30H46N2O5 | 详情 | 详情 | |
| (I) | 10127 | 1,3-Benzodioxole-5-carbaldehyde; Heliotropine | 120-57-0 | C8H6O3 | 详情 | 详情 |
| (II) | 20675 | 5-[(E)-2-nitroethenyl]-1,3-benzodioxole | 1485-00-3 | C9H7NO4 | 详情 | 详情 |
| (III) | 35024 | methyl 3-(4-methylcyclohexyl)-3-oxopropanoate | C11H18O3 | 详情 | 详情 | |
| (IV) | 35025 | methyl 3-(1,3-benzodioxol-5-yl)-2-[(4-methylcyclohexyl)carbonyl]-4-nitrobutanoate | C20H25NO7 | 详情 | 详情 | |
| (V) | 35026 | methyl 3-(1,3-benzodioxol-5-yl)-5-(4-methylcyclohexyl)-3,4-dihydro-2H-pyrrole-4-carboxylate | C20H25NO4 | 详情 | 详情 | |
| (VI) | 35027 | methyl 4-(1,3-benzodioxol-5-yl)-2-(4-methylcyclohexyl)-3-pyrrolidinecarboxylate | C20H27NO4 | 详情 | 详情 | |
| (VIII) | 20685 | 2-Bromo-N,N-dibutylacetamide; N,N-Dibutylbromoacetamide | C10H20BrNO | 详情 | 详情 |