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【结 构 式】 
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【分子编号】11313 【品名】(3'aS,4'R,5'R,6'aR)-5'-Hydroxyperhydrospiro[1,3-dioxolane-2,2'-pentalen]-4'-ylcarboxylic acid methyl ester 【CA登记号】 |
【 分 子 式 】C12H18O5 【 分 子 量 】242.27192 【元素组成】C 59.49% H 7.49% O 33.02% |
合成路线1
该中间体在本合成路线中的序号：(III)Monoketal (I) is acylated with dimethylcarbonate to (II), reduced with NaBH4 to give (III) and protected with tert-butyldimethylsilylchloride to give (IV). After selective reduction of the ester function of (IV) with DIBAH, the resulting aldehyde (V) undergoes a Wittig-Horner-reaction with dimethyl 2-oxo-2-cyclohexylethylphosphonate to give (VI), which is subsequently reduced with NaBH4. After separation of the epimeric alcohols by silica flash chromatography, (VII) is deprotected with a AcOH/THF/water mixture. Wittig reaction of 3-methoxycarbonylphenylmethylene-triphenylphosphorane with (VIII) gives a mixture of E/Z-isomers, which is separated by preparative HPLC. Ester hydrolysis with KOH and acidification of the E-isomer gives naxaprostene (IX), R = H.
| 【1】 Stezowski, J.J.; Flohé, L.; Böhlke, H.; The crystal structure of CG 4305, a biologically active prostacyclin analogue with exceptional chemical and metabolic stability. J Chem Soc Chem Commun 1983, 1315-6. |
| 【2】 Bohlke, H.; Loschen, G.; Michel, G.; Muller, B. (Grunenthal GmbH); New cis-bicyclo[3.3.0]octane derivs., medicines containing them and processes for the preparation of these compds. and medicines. DE 3146278 . |
| 【3】 Flohé, L.; Böhlke, H.; Frankus, E.; et al.; Designing prostacylin analogues. Arzneim-Forsch Drug Res 1983, 33, 9, 1240-8. |
| 【4】 Winter, W.; NAXAPROSTENE. Drugs Fut 1990, 15, 3, 233. |
| 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) | 11311 | Perhydropentalene-2,5-dione mono ethyleneketal | C10H14O3 | 详情 | 详情 | |
| (II) | 11312 | (3'aS,4'R,6'aS)-5'-Oxoperhydrospiro[1,3-dioxolane-2,2'-pentalen]-4'-ylcarboxylic acid methyl ester | C12H16O5 | 详情 | 详情 | |
| (III) | 11313 | (3'aS,4'R,5'R,6'aR)-5'-Hydroxyperhydrospiro[1,3-dioxolane-2,2'-pentalen]-4'-ylcarboxylic acid methyl ester | C12H18O5 | 详情 | 详情 | |
| (IV) | 11314 | (3'aS,4'R,5'R,6'aR)-5'-(tert-Butyldimethylsilyloxy)perhydrospiro[1,3-dioxolane-2,2'-pentalen]-4'-ylcarboxylic acid methyl ester | C18H32O5Si | 详情 | 详情 | |
| (V) | 11315 | (3'aS,4'R,5'R,6'aR)-5'-(tert-Butyldimethylsilyloxy)perhydrospiro[1,3-dioxolane-2,2'-pentalen]-4'-ylcarbaldehyde | C17H30O4Si | 详情 | 详情 | |
| (VI) | 11316 | (3'aS,4'R,5'R,6'aR)-3-[5'-(tert-Butyldimethylsilyloxy)perhydrospiro[1,3-dioxolane-2,2'-pentalen]-4'-yl]-1-cyclohexyl-2(E)-propen-1-one | C25H42O4Si | 详情 | 详情 | |
| (VII) | 11317 | (3'aS,4'R,5'R,6'aR)-3-[5'-(tert-Butyldimethylsilyloxy)perhydrospiro[1,3-dioxolane-2,2'-pentalen]-4'-yl]-1-cyclohexyl-2(E)-propen-1(S)-ol | C25H44O4Si | 详情 | 详情 | |
| (VIII) | 11318 | (3aS,4S,5R,6aR)-4-[(E,3S)-3-Cyclohexyl-3-hydroxy-1-propenyl]-5-hydroxyhexahydro-2(1H)-pentalenone | C17H26O3 | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(VIII)The decarboxylative hydrolysis ot 2beta,4alpha-di(methoxycarbonyl)-3alpha-(3-phenylpropyl)cyclopentanone (I) with HCl in refluxing acetic acid gives 3alpha-(3-phenylpropyl)cyclopentanone-4alpha-carboxylic acid methyl ester (II), which by successive reactions with oxalyl chloride in refluxing benzene, with diazomethane in ether, and with silver benzoate and triethylamine in methanol, is converted to 3alpha-(3-phenylpropyl)cyclopentanone-4alpha-acetic acid methyl ester (III). The dehydrogenation of (III) by reaction with N-bromosuccinimide and sodium selenobenzene in benzene and THF affords 3alpha-(3-phenyl-2-propenyl)cyclopentanone-4alpha-acetic acid methyl ester (IV), which is oxidized with sodium methaperiodate and Jones reagent, and methylated with diazomethane to give cyclopentanone 3alpha,4alpha-di(acetic acid) dimethyl ester (V). The reaction of (V) with ethyl eneglycol and p-toluenesulfonic acid yields the corresponding ketal (VI), which is submitted to a cyclization with sodium methoxide in hot methanol - DMSO to afford 7,7-ethylenedioxybicyclo[3.3.0] octan-3-one-4beta-carboxylic acid methyl ester (VII). The reduction of (VII) with NaBH4 in methanol gives the corresponding hydroxyester (VIII), which is protected with dihydropyran and p-toluenesulfonic acid to the corresponding tetrahydropyranyloxy compound (IX). The reduction of (IX) with LiAlH4 in ether affords the methanol derivative (X), which is oxidized with CrO3 - pyridine to the aldehyde (XI). The Wittig condensation of (XI) with dimethyl 2-oxo-4R,8-dimethyl-7-nonenylphosphonate (XII) by means of NaH in THF affords the dienic ketone (XIII).
| 【1】 Kojima, K.; Sakai, K.; Kobayashi, S. (Sankyo Co., Ltd.); Protacyclin compounds. DE 2900352; FR 2414039; GB 2012265; JP 54095552 . |
| 【2】 Prous, J.; Castaner, J.; CS-570. Drugs Fut 1986, 11, 11, 918. |
| 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) | 24516 | methyl (1R,2S,3R)-3-acetyl-4-oxo-2-(3-phenylpropyl)cyclopentanecarboxylate | C18H22O4 | 详情 | 详情 | |
| (II) | 24517 | methyl (1R,2S)-4-oxo-2-(3-phenylpropyl)cyclopentanecarboxylate | C16H20O3 | 详情 | 详情 | |
| (III) | 24518 | methyl 2-[(1S,2S)-4-oxo-2-(3-phenylpropyl)cyclopentyl]acetate | C17H22O3 | 详情 | 详情 | |
| (IV) | 24519 | methyl 2-[(1S,2S)-4-oxo-2-[(E)-3-phenyl-2-propenyl]cyclopentyl]acetate | C17H20O3 | 详情 | 详情 | |
| (V) | 24520 | methyl 2-[(1R,2S)-2-(2-methoxy-2-oxoethyl)-4-oxocyclopentyl]acetate | C11H16O5 | 详情 | 详情 | |
| (VI) | 24521 | methyl 2-[(7R,8S)-8-(2-methoxy-2-oxoethyl)-1,4-dioxaspiro[4.4]non-7-yl]acetate | C13H20O6 | 详情 | 详情 | |
| (VII) | 11312 | (3'aS,4'R,6'aS)-5'-Oxoperhydrospiro[1,3-dioxolane-2,2'-pentalen]-4'-ylcarboxylic acid methyl ester | C12H16O5 | 详情 | 详情 | |
| (VIII) | 11313 | (3'aS,4'R,5'R,6'aR)-5'-Hydroxyperhydrospiro[1,3-dioxolane-2,2'-pentalen]-4'-ylcarboxylic acid methyl ester | C12H18O5 | 详情 | 详情 | |
| (IX) | 24524 | (1'R,2'R,3'aR,6'aS)-2'-(Tetrahydropyranyloxy)spiro[1,3-dioxolane-2,5'-perhydropentalene]-1'-carboxylic acid | C17H26O6 | 详情 | 详情 | |
| (X) | 24525 | (1'R,2'R,3'aR,6'aS)-2'-(Tetrahydropyranyloxy)spiro[1,3-dioxolane-2,5'-perhydropentalene]-1'-methanol | C16H26O5 | 详情 | 详情 | |
| (XI) | 24526 | (1'R,2'R,3'aR,6'aS)-2'-(Tetrahydropyranyloxy)spiro[1,3-dioxolane-2,5'-perhydropentalene]-1'-carbaldehyde | C12H18O3 | 详情 | 详情 | |
| (XII) | 63310 | dimethyl (4R)-4,8-dimethyl-2-oxo-7-nonenylphosphonate | C13H25O4P | 详情 | 详情 | |
| (XIII) | 24527 | 5(R),9-Dimethyl-1-[(2'(R),3'a(R),6'a(S))-2'-(tetrahydropyranyloxy)spiro[1,3-dioxolane-2,5'-perhydropentalen]-1-yl]deca-1(E),8-dien-3-one | C27H42O5 | 详情 | 详情 |