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【结 构 式】 
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【分子编号】15171 【品名】ethyl 1-acetylcyclopropanecarboxylate 【CA登记号】 |
【 分 子 式 】C8H12O3 【 分 子 量 】156.18148 【元素组成】C 61.52% H 7.74% O 30.73% |
合成路线1
该中间体在本合成路线中的序号：(XXXIII)b) The intermediate 7(S)-(tert-Butoxycarbonylamino)-5-azaspiro[2.4]heptane (VII) can also be obtained as follows: 1) The cyclopropanation of ethyl acetoacetate (XXXI) with 1,2-dibromoethane (XXXII) by means of K2CO3 in DMF gives 1-acetylcyclopropane-1-carboxylic acid ethyl ester (XXXIII), which is brominated with Br2 in ethanol yielding the bromoacetyl derivative (XXXIV). The cyclization of (XXXI) with (R)-alpha-methylbenzylamine (XIII) by means of triethylamine affords 5-[1(R)-phenylethyl]-5-azaspiro[2.4]heptane-4,7-dione (XXXV), which by reaction with hydroxylamine is converted into the monooxime (XXXVI). The reduction of (XXXVI) with H2 over RaNi in methanol affords 7-amino-5-[1(R)-phenylethyl]-5-azaspiro[2.4]heptan-4-one as a diastereomeric mixture (XXXVII) + (XXXVIII), which is separated by column chromatography. The reduction of the (7S)-isomer (XXXVIII) with LiAlH4 in THF gives 7(S)-amino-5-[1(R)-phenylethyl]-5-azaspiro[2.4]heptane (XXXIX), which is protected in the usual way to the tert-butoxycarbonyl derivative (XL). Finally, this compound is debenzylated to (VII) by hydrogenation with H2 over Pd/C in ethanol.
| 【1】 Hayakawa, I.; Kimura, Y. (Daiichi Pharmaceutical Co., Ltd.); Optically active pyridone carboxylic acid derivs. AU 8933702; EP 0341493; JP 1990231475; JP 1995300416; JP 1999124367; JP 1999124380; US 5587386; US 5767127 . |
| 【2】 Castaner, J.; Graul, A.; Prous, J.; DU-6859. Drugs Fut 1994, 19, 9, 827. |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (XXXIX)) | 15177 | (7S)-5-[(1R)-1-phenylethyl]-5-azaspiro[2.4]heptan-7-amine; (7S)-5-[(1R)-1-phenylethyl]-5-azaspiro[2.4]hept-7-ylamine | C14H20N2 | 详情 | 详情 | |
| (VII) | 15131 | N-[(7S)-5-azaspiro[2.4]hept-7-yl]carbamic acid tert-butyl ester | 127199-45-5 | C11H20N2O2 | 详情 | 详情 |
| (XIII) | 10039 | (1R)-1-Phenylethylamine; (1R)-1-Phenyl-1-ethanamine.; L-alpha-Phenylethylamine | 3886-69-9 | C8H11N | 详情 | 详情 |
| (XXXI) | 11819 | ethyl acetoacetate; ethyl 3-oxobutanoate；Acetoacetic ester;Ethyl beta-ketobutyrate;ethyl 3-oxobutyrate | 141-97-9 | C6H10O3 | 详情 | 详情 |
| (XXXII) | 10252 | 1,2-Dibromoethane; Ethylene dibromide | 106-93-4 | C2H4Br2 | 详情 | 详情 |
| (XXXIII) | 15171 | ethyl 1-acetylcyclopropanecarboxylate | C8H12O3 | 详情 | 详情 | |
| (XXXIV) | 15172 | ethyl 1-(2-bromoacetyl)cyclopropanecarboxylate | C8H11BrO3 | 详情 | 详情 | |
| (XXXV) | 15173 | 5-[(1R)-1-phenylethyl]-5-azaspiro[2.4]heptane-4,7-dione | C14H15NO2 | 详情 | 详情 | |
| (XXXVI) | 15174 | 5-[(1R)-1-phenylethyl]-5-azaspiro[2.4]heptane-4,7-dione 7-oxime | C14H16N2O2 | 详情 | 详情 | |
| (XXXVII) | 15175 | (7R)-7-amino-5-[(1R)-1-phenylethyl]-5-azaspiro[2.4]heptan-4-one | C14H18N2O | 详情 | 详情 | |
| (XXXVIII) | 15176 | (7S)-7-amino-5-[(1R)-1-phenylethyl]-5-azaspiro[2.4]heptan-4-one | C14H18N2O | 详情 | 详情 | |
| (XL) | 15178 | N-[(7S)-5-[(1R)-1-phenylethyl]-5-azaspiro[2.4]hept-7-yl]carbamic acid | C15H20N2O2 | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(XXXIII)b) The intermediate 7(S)-(tert-Butoxycarbonylamino)-5-azaspiro[2.4]heptane (VII) can also be obtained as follows: 2) The reaction of 1-acetylcyclopropane-1-carboxylic acid ethyl ester (XXXIII) with (R)-alpha-methylbenzylamine (XIII) by means of NaOH and ethyl chloroformate gives the corresponding amide (XLI), which by reaction with ethylene glycol and p-toluenesulfonic acid is converted into the ethylene ketal (XLII). The bromination of (XLII) with Br2 in dioxane affords the bromomethyl dioxolane (XLIII), which is finally cyclized to 5-[1(R)-phenylethyl]-5-azaspiro[2.4]heptane-4,7-dione (XXXV), already obtained as an intermediate in the preceding synthesis.
| 【1】 Castaner, J.; Graul, A.; Prous, J.; DU-6859. Drugs Fut 1994, 19, 9, 827. |
| 【2】 Sato, K.; Saito, T.; Hayakawa, I.; Sato, M.; Yafune, T.; Atarashi, S.; Une, T.; Kimura, Y.; Kawakami, K.; Design and structure-activity relationship of new N1-cis-2-fluorocyclopropyl quinolones. 31st. 31st Intersci Conf Antimicrob Agents Chemother (Sept 29-Oct 2, Chicago) 1991, Abst 1504. |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (XIII) | 10039 | (1R)-1-Phenylethylamine; (1R)-1-Phenyl-1-ethanamine.; L-alpha-Phenylethylamine | 3886-69-9 | C8H11N | 详情 | 详情 |
| (XXXIII) | 15171 | ethyl 1-acetylcyclopropanecarboxylate | C8H12O3 | 详情 | 详情 | |
| (XXXV) | 15173 | 5-[(1R)-1-phenylethyl]-5-azaspiro[2.4]heptane-4,7-dione | C14H15NO2 | 详情 | 详情 | |
| (XLI) | 15179 | 1-acetyl-N-[(1R)-1-phenylethyl]cyclopropanecarboxamide | C14H17NO2 | 详情 | 详情 | |
| (XLII) | 15180 | 1-(2-methyl-1,3-dioxolan-2-yl)-N-[(1R)-1-phenylethyl]cyclopropanecarboxamide | C16H21NO3 | 详情 | 详情 | |
| (XLIII) | 15181 | 1-[2-(bromomethyl)-1,3-dioxolan-2-yl]-N-[(1R)-1-phenylethyl]cyclopropanecarboxamide | C16H20BrNO3 | 详情 | 详情 |
合成路线3
该中间体在本合成路线中的序号：(III)The intermediate fluoropyrrolidine (XIV) was obtained as follows: Alkylation of ethyl acetoacetate (I) with 1,2-dibromoethane (II) led to the cyclopropane derivative (III). Bromination of (III) provided bromo ketone (IV), which was condensed with (S)-1-phenylethylamine (V), yielding amino ketone (VI). Acylation of amine (VI) with (diethylfosfonyl)fluoroacetyl chloride (VII) gave amide (VIII). Intramolecular Wadsworth-Emmons condensation of keto phosphonate (VIII) in the presence of potassium tert-butoxide produced the pyrrolinone (IX). Catalytic hydrogenation of the pyrroline double bond of (IX), followed by separation of the resultant diastereomeric mixture, furnished pyrrolidinone (X). After saponification of the ethyl ester group of (X), the resulting acid (XI) was subjected to Curtius rearrangement in the presence of DPPA and t-BuOH, giving rise to carbamate (XII). Lactam (XII) reduction by means of borane in THF afforded pyrrolidine (XIII). The N-phenylethyl group of (XIII) was then removed by hydrogenation over Pd/C to furnish the required intermediate pyrrolidine (XIV) (See scheme no. 27170201a, intermediate (IX)).
| 【1】 Takahashi, H.; et al.; DQ-113 (D61-1113), a potent fluoroquinolone against multi-drug resistance Gram-positive bacteria: Practical synthesis, and in vitro and in vivo activities. 41st Intersci Conf Antimicrob Agents Chemother (Dec 16 2001, Chicago) 2001, Abst F-550. |
| 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) | 11819 | ethyl acetoacetate; ethyl 3-oxobutanoate；Acetoacetic ester;Ethyl beta-ketobutyrate;ethyl 3-oxobutyrate | 141-97-9 | C6H10O3 | 详情 | 详情 |
| (II) | 10252 | 1,2-Dibromoethane; Ethylene dibromide | 106-93-4 | C2H4Br2 | 详情 | 详情 |
| (III) | 15171 | ethyl 1-acetylcyclopropanecarboxylate | C8H12O3 | 详情 | 详情 | |
| (IV) | 15172 | ethyl 1-(2-bromoacetyl)cyclopropanecarboxylate | C8H11BrO3 | 详情 | 详情 | |
| (V) | 20042 | (1S)-1-phenyl-1-ethanamine; (1S)-1-phenylethylamine | C8H11N | 详情 | 详情 | |
| (VI) | 55739 | ethyl 1-(2-{[(1S)-1-phenylethyl]amino}acetyl)cyclopropanecarboxylate | C16H21NO3 | 详情 | 详情 | |
| (VII) | 55740 | diethyl 2-chloro-1-fluoro-2-oxoethylphosphonate | C6H11ClFO4P | 详情 | 详情 | |
| (VIII) | 55741 | ethyl 1-(2-{[2-(diethoxyphosphoryl)-2-fluoroacetyl][(1S)-1-phenylethyl]amino}acetyl)cyclopropanecarboxylate | C22H31FNO7P | 详情 | 详情 | |
| (IX) | 55742 | ethyl 1-{4-fluoro-5-oxo-1-[(1S)-1-phenylethyl]-2,5-dihydro-1H-pyrrol-3-yl}cyclopropanecarboxylate | C18H20FNO3 | 详情 | 详情 | |
| (X) | 44225 | ethyl 1-[(3S,4S)-4-fluoro-5-oxo-1-[(1S)-1-phenylethyl]pyrrolidinyl]cyclopropanecarboxylate | C18H22FNO3 | 详情 | 详情 | |
| (XI) | 55743 | 1-{(3S,4S)-4-fluoro-5-oxo-1-[(1S)-1-phenylethyl]pyrrolidinyl}cyclopropanecarboxylic acid | C16H18FNO3 | 详情 | 详情 | |
| (XII) | 55744 | tert-butyl 1-{(3R,4S)-4-fluoro-5-oxo-1-[(1S)-1-phenylethyl]pyrrolidinyl}cyclopropylcarbamate | C20H27FN2O3 | 详情 | 详情 | |
| (XIII) | 55745 | tert-butyl 1-{(3R,4S)-4-fluoro-1-[(1S)-1-phenylethyl]pyrrolidinyl}cyclopropylcarbamate | C20H29FN2O2 | 详情 | 详情 | |
| (XIV) | 44231 | tert-butyl 1-[(3R,4S)-4-fluoropyrrolidinyl]cyclopropylcarbamate | C12H21FN2O2 | 详情 | 详情 |