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【结 构 式】

【药物名称】Oleanolic acid

【化学名称】3beta-Hydroxyolean-12-en-28-oic acid

【CA登记号】508-02-1

【 分 子 式 】C30H48O3

【 分 子 量 】456.71526

【开发单位】Regional Research Laboratory, Jammu-Tawi (Originator)

【药理作用】Antiinflammatory Drugs

合成路线1

The dihydroxylation of the farnesyl acetate (I) with Noe-Lin catalyst gives the dihydroxy compound (II), which is converted to the epoxide (III) by treatment first with mesyl chloride and pyridine, and then with K2CO3 in methanol. The reaction of (III) with mesyl chloride and LiBr in THF yields the bromide (IV), which is condensed with the silylated amine (V) by means of LDA in AcOH / NaOAc affording the epoxidized acyl silane (VI). The condensation of (VI) with isopropenyllithium (VII) and the cyclohexenylmethyl bromide (VIII) by means of BaI2 in THF gives the precursor (IX), which is cyclized by means of MeAlCl2 and protected with TBDMS-Cl in dichloromethane yielding the tricyclic ketone (X). The reaction of (X) with Tf2N-Ph affords the enol triflate (XI), which is further cyclized by means of Me3Sn-SnMe3 and palladium tetrakis(triphenylphosphine) in refluxing THF giving the silylated pentacyclic alcohol (XII), which is desilylated with TBAF in THF affording the pentacyclic alcohol (XIII). The benzoylation of (XIII) with benzoyl chloride gives benzoate (XIV), which is selectively methylenated with CH2I2 and Br2Zn in toluene yielding the cyclopropanated compound (XV).

1 Huang, A.X.; Corey, E.J.; Xiong, Z.; An exceptionally short and simple enantioselective total synthesis of pentacyclic triterpenes of the beta-amyrin family. J Am Chem Soc 1999, 121, 43, 9999.
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) 35270 (2E,6E)-3,7,11-trimethyl-2,6,10-dodecatrienyl acetate 29548-30-9 C17H28O2 详情 详情
(II) 35271 (2E,6E,10R)-10,11-dihydroxy-3,7,11-trimethyl-2,6-dodecadienyl acetate C17H30O4 详情 详情
(III) 35272 (2E,6E)-9-[(2S)-3,3-dimethyloxiranyl]-3,7-dimethyl-2,6-nonadien-1-ol C15H26O2 详情 详情
(IV) 35273 (3S)-3-[(3E,7E)-9-bromo-3,7-dimethyl-3,7-nonadienyl]-2,2-dimethyloxirane C15H25BrO 详情 详情
(V) 35274 N-[(Z)-1-[tert-butyl(dimethyl)silyl]ethylidene]-1-methoxy-2-propanamine; N-[(Z)-1-[tert-butyl(dimethyl)silyl]ethylidene]-N-(2-methoxy-1-methylethyl)amine C12H27NOSi 详情 详情
(VI) 35275 (4E,8E)-1-[tert-butyl(dimethyl)silyl]-11-[(2S)-3,3-dimethyloxiranyl]-5,9-dimethyl-4,8-undecadien-1-one C23H42O2Si 详情 详情
(VII) 35276 isopropenyllithium C3H5Li 详情 详情
(VIII) 35277 2-bromo-1-(bromomethyl)-4,4-dimethyl-1-cyclohexene C9H14Br2 详情 详情
(IX) 35278 ([(4E,8E)-1-[(Z)-3-(2-bromo-4,4-dimethyl-1-cyclohexen-1-yl)-1-methylpropylidene]-11-[(2S)-3,3-dimethyloxiranyl]-5,9-dimethyl-4,8-undecadienyl]oxy)(tert-butyl)dimethylsilane; (4E,8E)-1-[(Z)-3-(2-bromo-4,4-dimethyl-1-cyclohexen-1-yl)-1-methylpropylidene]-11-[(2S)-3,3-dimethyloxiranyl]-5,9-dimethyl-4,8-undecadienyl tert-butyl(dimethyl)silyl ether C35H61BrO2Si 详情 详情
(X) 35279 (1S,4aR,4bR,7S,8aR,10aR)-1-[2-(2-bromo-4,4-dimethyl-1-cyclohexen-1-yl)ethyl]-7-[[tert-butyl(dimethyl)silyl]oxy]-1,4b,8,8,10a-pentamethyldodecahydro-2(1H)-phenanthrenone C35H61BrO2Si 详情 详情
(XI) 35280 (1S,4aR,4bR,7S,8aR,10aR)-1-[2-(2-bromo-4,4-dimethyl-1-cyclohexen-1-yl)ethyl]-7-[[tert-butyl(dimethyl)silyl]oxy]-1,4b,8,8,10a-pentamethyl-1,4,4a,4b,5,6,7,8,8a,9,10,10a-dodecahydro-2-phenanthrenyl trifluoromethanesulfonate C36H60BrF3O4SSi 详情 详情
(XII) 35281 (3S,4aR,6aR,6bS,14aR,14bR)-4,4,6a,6b,11,11,14b-heptamethyl-1,2,3,4,4a,5,6,6a,6b,7,8,9,10,11,12,14,14a,14b-octadecahydro-3-picenyl tert-butyl(dimethyl)silyl ether; [[(3S,4aR,6aR,6bS,14aR,14bR)-4,4,6a,6b,11,11,14b-heptamethyl-1,2,3,4,4a,5,6,6a,6b,7,8,9,10,11,12,14,14a,14b-octadecahydro-3-picenyl]oxy](tert-butyl)dimethylsilane C35H60OSi 详情 详情
(XIII) 35282 (3S,4aR,6aR,6bS,14aR,14bR)-4,4,6a,6b,11,11,14b-heptamethyl-1,2,3,4,4a,5,6,6a,6b,7,8,9,10,11,12,14,14a,14b-octadecahydro-3-picenol C29H46O 详情 详情
(XIV) 35283 (3S,4aR,6aR,6bS,14aR,14bR)-4,4,6a,6b,11,11,14b-heptamethyl-1,2,3,4,4a,5,6,6a,6b,7,8,9,10,11,12,14,14a,14b-octadecahydro-3-picenyl benzoate C36H50O2 详情 详情
(XV) 35284   C37H52O2 详情 详情

合成路线2

Elimination of the benzoyl group of (XV) with DIBAL in dichloromethane affords alcohol (XVI), which is silylated with TBDMS-Cl and imidazole in DMF giving the silyl ether (XVII). Cleavage of the cyclopropane ring of (XVII) with tert-butyl perbenzoate, followed by hydrolysis of the resulting ester yields the methanol derivative (XVIII), which is selectively reduced with Li in THF/NH3 affor-ding the cis-isomer (XIX). Finally, this compound is oxidized with NaClO4 in tert-butanol and desilylated with tetrabutylammonium fluoride.

1 Huang, A.X.; Corey, E.J.; Xiong, Z.; An exceptionally short and simple enantioselective total synthesis of pentacyclic triterpenes of the beta-amyrin family. J Am Chem Soc 1999, 121, 43, 9999.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(XV) 35284   C37H52O2 详情 详情
(XVI) 35285   C30H48O 详情 详情
(XVII) 35286   C36H62OSi 详情 详情
(XVIII) 35287 [(6aS,6bR,8aR,10S,12aR,12bR)-10-[[tert-butyl(dimethyl)silyl]oxy]-2,2,6a,6b,9,9,12a-heptamethyl-1,3,4,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b-hexadecahydro-4(2H)-picenyl]methanol C36H62O2Si 详情 详情
(XIX) 35288 [(6aS,6bR,8aR,10S,12aR,12bR,14bS)-10-[[tert-butyl(dimethyl)silyl]oxy]-2,2,6a,6b,9,9,12a-heptamethyl-1,3,4,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b,13,14b-octadecahydro-4(2H)-picenyl]methanol C36H64O2Si 详情 详情

合成路线3

The methylation of 7-methoxy-1-tetralone (I) with methyl iodide and potassium tert-butoxide in THF gives the 2,2-dimethyl derivative (II), which is reduced with NaBH4 and acetylated with acetyl chloride yielding the acetate (III). The reduction of (III) with diethylborohydride in TFA affords 7-methoxy-2,2-dimethyltetraline (IV), which is submitted to a Birch reduction with Li/NH3 in THF affording 2,2-dimethyl-7-methoxy-1,2,3,4,5,8-hexahydronaphthalene (V). The condensation of (V) with homofarnesyl iodide (VI) by means of BuLi in THF gives intermediate (VII), which is treated with 2-sulfanylethanol and TFA yielding the ketone (VIII). The reaction of (VIII) with KHMDS and Tf2N-Ph in THF affords the enol triflate (IX), which is selectively brominated with N-bromosuccinimide (NBS) in THF giving the bromohydrine (X). The epoxidation of (X) with K2CO3 in methanol, followed by methylation with Me2CuLi in THF yields the epoxide (XI), which is treated with SiF4 and TFA to afford the fluoroketone (XII). The stereocontroled reduction of the ketone group of (XII) with a chiral oxaazaborolidine (OABL) gives the chiral alcohol (XIII), which is epoxidized by means of sodium isopropoxide in isopropanol yielding the chiral epoxide (XIV).

1 Corey, E.J.; Lee, J.; Enantioselective total synthesis of oleanolic acid, erythrodiol, beta-amyrin, and other pentacyclic triterpenes from a common intermediate. J Am Chem Soc 1993, 115, 8873.
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) 21385 7-methoxy-3,4-dihydro-1(2H)-naphthalenone 6836-19-7 C11H12O2 详情 详情
(II) 35723 7-methoxy-2,2-dimethyl-3,4-dihydro-1(2H)-naphthalenone C13H16O2 详情 详情
(III) 35724 7-methoxy-2,2-dimethyl-1,2,3,4-tetrahydro-1-naphthalenyl acetate C15H20O3 详情 详情
(IV) 35725 7-methoxy-2,2-dimethyl-1,2,3,4-tetrahydronaphthalene; 7,7-dimethyl-5,6,7,8-tetrahydro-2-naphthalenyl methyl ether C13H18O 详情 详情
(V) 35726 7,7-dimethyl-1,4,5,6,7,8-hexahydro-2-naphthalenyl methyl ether; 7-methoxy-2,2-dimethyl-1,2,3,4,5,8-hexahydronaphthalene C13H20O 详情 详情
(VI) 35727 (6E,10E)-13-iodo-2,6,10-trimethyl-2,6,10-tridecatriene C16H27I 详情 详情
(VII) 35728 7-methoxy-2,2-dimethyl-8-[(3E,7E)-4,8,12-trimethyl-3,7,11-tridecatrienyl]-1,2,3,4,5,8-hexahydronaphthalene; 7,7-dimethyl-1-[(3E,7E)-4,8,12-trimethyl-3,7,11-tridecatrienyl]-1,4,5,6,7,8-hexahydro-2-naphthalenyl methyl ether C29H46O 详情 详情
(VIII) 35729 7,7-dimethyl-1-[(3E,7E)-4,8,12-trimethyl-3,7,11-tridecatrienyl]-3,4,5,6,7,8-hexahydro-2(1H)-naphthalenone C28H44O 详情 详情
(IX) 35730 7,7-dimethyl-1-[(3E,7E)-4,8,12-trimethyl-3,7,11-tridecatrienyl]-3,4,5,6,7,8-hexahydro-2-naphthalenyl trifluoromethanesulfonate C29H43F3O3S 详情 详情
(X) 35731 1-[(3E,7E)-11-bromo-12-hydroxy-4,8,12-trimethyl-3,7-tridecadienyl]-7,7-dimethyl-3,4,5,6,7,8-hexahydro-2-naphthalenyl trifluoromethanesulfonate C29H44BrF3O4S 详情 详情
(XI) 35732 3-[(3E,7E)-3,7-dimethyl-10-(2,7,7-trimethyl-3,4,5,6,7,8-hexahydro-1-naphthalenyl)-3,7-decadienyl]-2,2-dimethyloxirane C29H46O 详情 详情
(XII) 35733 (6E,10E)-2-fluoro-2,6,10-trimethyl-13-(2,7,7-trimethyl-3,4,5,6,7,8-hexahydro-1-naphthalenyl)-6,10-tridecadien-3-one C29H45FO 详情 详情
(XIII) 35734 (3S,6E,10E)-2-fluoro-2,6,10-trimethyl-13-(2,7,7-trimethyl-3,4,5,6,7,8-hexahydro-1-naphthalenyl)-6,10-tridecadien-3-ol C29H47FO 详情 详情
(XIV) 35735 (3S)-3-[(3E,7E)-3,7-dimethyl-10-(2,7,7-trimethyl-3,4,5,6,7,8-hexahydro-1-naphthalenyl)-3,7-decadienyl]-2,2-dimethyloxirane C29H46O 详情 详情

合成路线4

The cyclization of (XIV) by means of MeAlCl2 in dichloromethane followed by benzoylation with benzoyl chloride gives a mixture of benzoates (XV) and (XVI) that are separated by chromatography. The desired isomer (XV) (additional (XV) is obtained by isomerization of (XVI) by HCl in hot acetic acid) was selctively methylenated with CH2I2 and Br2Zn in toluene yielding the cyclopropanated compound (XVII). Elimination of the benzoyl group of (XVII) with DIBAL in dichloromethane affords alcohol (XVIII), which is silylated with TBDMS-Cl and imidazole in DMF giving the silyl ether (XIX). The cleavage of the cyclopropane ring of (XIX) with tert-butyl perbenzoate, followed by hydrolysis of the resulting ester yields the methanol derivative (XX), which is selectively reduced with Li in THF/NH3 affording the cis-isomer (XXI). Finally, this compound is oxidized with NaClO4 in tert-butanol, and desilylated with tetrabutylammonium fluoride to give the target oleanolic acid.

1 Corey, E.J.; Lee, J.; Enantioselective total synthesis of oleanolic acid, erythrodiol, beta-amyrin, and other pentacyclic triterpenes from a common intermediate. J Am Chem Soc 1993, 115, 8873.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(XIV) 35735 (3S)-3-[(3E,7E)-3,7-dimethyl-10-(2,7,7-trimethyl-3,4,5,6,7,8-hexahydro-1-naphthalenyl)-3,7-decadienyl]-2,2-dimethyloxirane C29H46O 详情 详情
(XV) 35283 (3S,4aR,6aR,6bS,14aR,14bR)-4,4,6a,6b,11,11,14b-heptamethyl-1,2,3,4,4a,5,6,6a,6b,7,8,9,10,11,12,14,14a,14b-octadecahydro-3-picenyl benzoate C36H50O2 详情 详情
(XVI) 35736 (3S,4aR,6aR,6bS,14aR,14bR)-4,4,6a,6b,11,11,14b-heptamethyl-1,2,3,4,4a,5,6,6a,6b,7,8,10,11,12,13,14,14a,14b-octadecahydro-3-picenyl benzoate C36H50O2 详情 详情
(XVII) 35284   C37H52O2 详情 详情
(XVIII) 35285   C30H48O 详情 详情
(XIX) 35286   C36H62OSi 详情 详情
(XX) 35287 [(6aS,6bR,8aR,10S,12aR,12bR)-10-[[tert-butyl(dimethyl)silyl]oxy]-2,2,6a,6b,9,9,12a-heptamethyl-1,3,4,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b-hexadecahydro-4(2H)-picenyl]methanol C36H62O2Si 详情 详情
(XXI) 35288 [(6aS,6bR,8aR,10S,12aR,12bR,14bS)-10-[[tert-butyl(dimethyl)silyl]oxy]-2,2,6a,6b,9,9,12a-heptamethyl-1,3,4,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b,13,14b-octadecahydro-4(2H)-picenyl]methanol C36H64O2Si 详情 详情
Extended Information