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【结 构 式】 
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【分子编号】46114 【品名】(4Z,7S,8E)-7-[[tert-butyl(dimethyl)silyl]oxy]-4,8-dimethyl-9-(2-methyl-1,3-thiazol-4-yl)-4,8-nonadien-1-ol 【CA登记号】 |
【 分 子 式 】C21H37NO2SSi 【 分 子 量 】395.68182 【元素组成】C 63.75% H 9.43% N 3.54% O 8.09% S 8.1% Si 7.1% |
合成路线1
该中间体在本合成路线中的序号：(XI)The synthesis of the intermediate chiral aldehyde (XVIII) has been obtained as follows: The reduction of 2-methylthiazole-4-carboxylic acid methyl ester (I) with DIBAL in dichloromethane gives the aldehyde (II), which by condensation with phosphorane (III) in refluxing benzene yields the unsaturated aldehyde (IV). The condensation of (IV) with the chiral borane (V) in ethyl ether affords the chiral unsaturated alcohol (VI), which is treated with Tbdms-Cl and imidazole to provide the sill ether (VII). The oxidation of the terminal double bond of (VIII) with OsO4 and Pb(OAc)4 in THF/tBuOH/water gives the aldehyde (VIII), which is condensed with the phosphorane (IX) in refluxing benzene to yield the carboxylic acid (X). The reduction of (X) with DIBAL in THF affords the carbinol (XI), which is reduced by reaction with CCl4 and PPh3, followed by a reductive dechlorination with LiBHEt3, to furnish the dimethylated olefin (XII). Hydroxylation of the terminal double bond of (XII) with 9-BBN in THF gives the primary alcohol (XIII), which is treated with I2 and PPh3 in ethyl ether/CH3CN to yield the iodo derivative (XIV). The condensation of (XIV) with the chiral 1-(propylideneamino)pyrrolidine (XV) by means of LDA in THF affords intermediate (XVI), which is converted into the nitrile (XVII) by reaction with monoperoxyphthalic acid magnesium salt (MMPP) in MeOH. Finally this compound is reduced with DIBAL in toluene to afford the target aldehyde intermediate (XVIII).
| 【1】 Nicolaou, K.C.; et al.; Total syntheses of epothilones A and B via a macrolactonization-based strategy. J Am Chem Soc 1997, 119, 34, 7974. |
| 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) | 44454 | ethyl 2-methyl-1,3-thiazole-4-carboxylate | 6436-59-5 | C7H9NO2S | 详情 | 详情 |
| (II) | 44455 | 2-methyl-1,3-thiazole-4-carbaldehyde | C5H5NOS | 详情 | 详情 | |
| (III) | 39940 | 2-(triphenylphosphoranylidene)propanal | C21H19OP | 详情 | 详情 | |
| (IV) | 44456 | (E)-2-methyl-3-(2-methyl-1,3-thiazol-4-yl)-2-propenal | C8H9NOS | 详情 | 详情 | |
| (V) | 44449 | allyl[bis[(1R,2S,5R)-2,6,6-trimethylbicyclo[3.1.1]hept-3-yl]]borane | C23H39B | 详情 | 详情 | |
| (VI) | 43171 | (1E,3S)-2-methyl-1-(2-methyl-1,3-thiazol-4-yl)-1,5-hexadien-3-ol | C11H15NOS | 详情 | 详情 | |
| (VII) | 44444 | 4-((1E,3S)-3-[[tert-butyl(dimethyl)silyl]oxy]-2-methyl-1,5-hexadienyl)-2-methyl-1,3-thiazole; tert-butyl(dimethyl)silyl (1S)-1-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-3-butenyl ether | C17H29NOSSi | 详情 | 详情 | |
| (VIII) | 40822 | (3S,4E)-3-[[tert-butyl(dimethyl)silyl]oxy]-4-methyl-5-(2-methyl-1,3-thiazol-4-yl)-4-pentenal | C16H27NO2SSi | 详情 | 详情 | |
| (IX) | 46110 | methyl 2-(triphenylphosphoranylidene)-4-pentenoate | C24H23O2P | 详情 | 详情 | |
| (X) | 46113 | 4-((1E,3S,5Z)-3-[[tert-butyl(dimethyl)silyl]oxy]-2,6-dimethyl-1,5,8-nonatrienyl)-2-methyl-1,3-thiazole; tert-butyl(dimethyl)silyl (1S,3Z)-4-methyl-1-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-3,6-heptadienyl ether | C21H35NOSSi | 详情 | 详情 | |
| (XI) | 46114 | (4Z,7S,8E)-7-[[tert-butyl(dimethyl)silyl]oxy]-4,8-dimethyl-9-(2-methyl-1,3-thiazol-4-yl)-4,8-nonadien-1-ol | C21H37NO2SSi | 详情 | 详情 | |
| (XII) | 46115 | 4-((1E,3S,5Z)-3-[[tert-butyl(dimethyl)silyl]oxy]-9-iodo-2,6-dimethyl-1,5-nonadienyl)-2-methyl-1,3-thiazole; tert-butyl(dimethyl)silyl (1S,3Z)-7-iodo-4-methyl-1-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-3-heptenyl ether | C21H36INOSSi | 详情 | 详情 | |
| (XIII) | 46116 | (2R)-N-[(Z,2S,6Z,9S,10E)-9-[[tert-butyl(dimethyl)silyl]oxy]-2,6,10-trimethyl-11-(2-methyl-1,3-thiazol-4-yl)-6,10-undecadienylidene]-2-methoxy-1-pyrrolidinamine; N-[(Z,2S,6Z,9S,10E)-9-[[tert-butyl(dimethyl)silyl]oxy]-2,6,10-trimethyl-11-(2-methyl-1,3-thiazol-4-yl)-6,10-undecadienylidene]-N-[(2R)-2-methoxypyrrolidinyl]amine | C29H51N3O2SSi | 详情 | 详情 | |
| (XIV) | 46117 | (2S,6Z,9S,10E)-9-[[tert-butyl(dimethyl)silyl]oxy]-2,6,10-trimethyl-11-(2-methyl-1,3-thiazol-4-yl)-6,10-undecadienenitrile | C24H40N2OSSi | 详情 | 详情 | |
| (XV) | 44460 | N-[(2R)-2-methoxypyrrolidinyl]-N-[(E)propylidene]amine; (2R)-2-methoxy-N-[(E)propylidene]-1-pyrrolidinamine | C8H16N2O | 详情 | 详情 | |
| (XVI) | 46118 | (3S,6R,7S,8S,12Z,15S,16E)-3,15-bis[[tert-butyl(dimethyl)silyl]oxy]-7-hydroxy-4,4,6,8,12,16-hexamethyl-17-(2-methyl-1,3-thiazol-4-yl)-5-oxo-12,16-heptadecadienoic acid | C39H71NO6SSi2 | 详情 | 详情 | |
| (XVII) | 46119 | tert-butyl(dimethyl)silyl (3S,6R,7S,8S,12Z,15S,16E)-3,7,15-tris[[tert-butyl(dimethyl)silyl]oxy]-4,4,6,8,12,16-hexamethyl-17-(2-methyl-1,3-thiazol-4-yl)-5-oxo-12,16-heptadecadienoate | C51H99NO6SSi4 | 详情 | 详情 | |
| (XVIII) | 40829 | (2S,6Z,9S,10E)-9-[[tert-butyl(dimethyl)silyl]oxy]-2,6,10-trimethyl-11-(2-methyl-1,3-thiazol-4-yl)-6,10-undecadienal | C24H41NO2SSi | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(XI)The synthesis of the intermediate chiral aldehyde (XVIII) has been obtained as follows: The reduction of 2-methylthiazole-4-carboxylic acid methyl ester (I) with DIBAL in dichloromethane gives the aldehyde (II), which by condensation with phosphorane (III) in refluxing benzene yields the unsaturated aldehyde (IV). The condensation of (IV) with the chiral borane (V) in ethyl ether affords the chiral unsaturated alcohol (VI), which is treated with Tbdms-Cl and imidazole to provide the sill ether (VII). The oxidation of the terminal double bond of (VIII) with OsO4 and Pb(OAc)4 in THF/tBuOH/water gives the aldehyde (VIII), which is condensed with the phosphorane (IX) in refluxing benzene to yield the carboxylic acid (X). The reduction of (X) with DIBAL in THF affords the carbinol (XI), which is reduced by reaction with CCl4 and PPh3, followed by a reductive dechlorination with LiBHEt3, to furnish the dimethylated olefin (XII). Hydroxylation of the terminal double bond of (XII) with 9-BBN in THF gives the primary alcohol (XIII), which is treated with I2 and PPh3 in ethyl ether/acetonitrile to yield the iodo derivative (XIV). The condensation of (XIV) with the chiral 1-(propylideneamino)pyrrolidine (XV) by means of LDA in THF affords intermediate (XVI), which is converted into the nitrile (XVII) by reaction with monoperoxyphthalic acid magnesium salt (MMPP) in methanol. Finally, this compound is reduced with DIBAL in toluene to afford the target aldehyde intermediate (XVIII).
| 【1】 Nicolaou, K.C.; et al.; Total syntheses of epothilones A and B via a macrolactonization-based strategy. J Am Chem Soc 1997, 119, 34, 7974. |
| 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) | 44454 | ethyl 2-methyl-1,3-thiazole-4-carboxylate | 6436-59-5 | C7H9NO2S | 详情 | 详情 |
| (II) | 44455 | 2-methyl-1,3-thiazole-4-carbaldehyde | C5H5NOS | 详情 | 详情 | |
| (III) | 39940 | 2-(triphenylphosphoranylidene)propanal | C21H19OP | 详情 | 详情 | |
| (IV) | 44456 | (E)-2-methyl-3-(2-methyl-1,3-thiazol-4-yl)-2-propenal | C8H9NOS | 详情 | 详情 | |
| (V) | 44449 | allyl[bis[(1R,2S,5R)-2,6,6-trimethylbicyclo[3.1.1]hept-3-yl]]borane | C23H39B | 详情 | 详情 | |
| (VI) | 43171 | (1E,3S)-2-methyl-1-(2-methyl-1,3-thiazol-4-yl)-1,5-hexadien-3-ol | C11H15NOS | 详情 | 详情 | |
| (VII) | 44444 | 4-((1E,3S)-3-[[tert-butyl(dimethyl)silyl]oxy]-2-methyl-1,5-hexadienyl)-2-methyl-1,3-thiazole; tert-butyl(dimethyl)silyl (1S)-1-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-3-butenyl ether | C17H29NOSSi | 详情 | 详情 | |
| (VIII) | 40822 | (3S,4E)-3-[[tert-butyl(dimethyl)silyl]oxy]-4-methyl-5-(2-methyl-1,3-thiazol-4-yl)-4-pentenal | C16H27NO2SSi | 详情 | 详情 | |
| (IX) | 46110 | methyl 2-(triphenylphosphoranylidene)-4-pentenoate | C24H23O2P | 详情 | 详情 | |
| (X) | 46113 | 4-((1E,3S,5Z)-3-[[tert-butyl(dimethyl)silyl]oxy]-2,6-dimethyl-1,5,8-nonatrienyl)-2-methyl-1,3-thiazole; tert-butyl(dimethyl)silyl (1S,3Z)-4-methyl-1-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-3,6-heptadienyl ether | C21H35NOSSi | 详情 | 详情 | |
| (XI) | 46114 | (4Z,7S,8E)-7-[[tert-butyl(dimethyl)silyl]oxy]-4,8-dimethyl-9-(2-methyl-1,3-thiazol-4-yl)-4,8-nonadien-1-ol | C21H37NO2SSi | 详情 | 详情 | |
| (XII) | 46115 | 4-((1E,3S,5Z)-3-[[tert-butyl(dimethyl)silyl]oxy]-9-iodo-2,6-dimethyl-1,5-nonadienyl)-2-methyl-1,3-thiazole; tert-butyl(dimethyl)silyl (1S,3Z)-7-iodo-4-methyl-1-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-3-heptenyl ether | C21H36INOSSi | 详情 | 详情 | |
| (XIII) | 46116 | (2R)-N-[(Z,2S,6Z,9S,10E)-9-[[tert-butyl(dimethyl)silyl]oxy]-2,6,10-trimethyl-11-(2-methyl-1,3-thiazol-4-yl)-6,10-undecadienylidene]-2-methoxy-1-pyrrolidinamine; N-[(Z,2S,6Z,9S,10E)-9-[[tert-butyl(dimethyl)silyl]oxy]-2,6,10-trimethyl-11-(2-methyl-1,3-thiazol-4-yl)-6,10-undecadienylidene]-N-[(2R)-2-methoxypyrrolidinyl]amine | C29H51N3O2SSi | 详情 | 详情 | |
| (XIV) | 46117 | (2S,6Z,9S,10E)-9-[[tert-butyl(dimethyl)silyl]oxy]-2,6,10-trimethyl-11-(2-methyl-1,3-thiazol-4-yl)-6,10-undecadienenitrile | C24H40N2OSSi | 详情 | 详情 | |
| (XV) | 44460 | N-[(2R)-2-methoxypyrrolidinyl]-N-[(E)propylidene]amine; (2R)-2-methoxy-N-[(E)propylidene]-1-pyrrolidinamine | C8H16N2O | 详情 | 详情 | |
| (XVI) | 46118 | (3S,6R,7S,8S,12Z,15S,16E)-3,15-bis[[tert-butyl(dimethyl)silyl]oxy]-7-hydroxy-4,4,6,8,12,16-hexamethyl-17-(2-methyl-1,3-thiazol-4-yl)-5-oxo-12,16-heptadecadienoic acid | C39H71NO6SSi2 | 详情 | 详情 | |
| (XVII) | 46119 | tert-butyl(dimethyl)silyl (3S,6R,7S,8S,12Z,15S,16E)-3,7,15-tris[[tert-butyl(dimethyl)silyl]oxy]-4,4,6,8,12,16-hexamethyl-17-(2-methyl-1,3-thiazol-4-yl)-5-oxo-12,16-heptadecadienoate | C51H99NO6SSi4 | 详情 | 详情 | |
| (XVIII) | 40829 | (2S,6Z,9S,10E)-9-[[tert-butyl(dimethyl)silyl]oxy]-2,6,10-trimethyl-11-(2-methyl-1,3-thiazol-4-yl)-6,10-undecadienal | C24H41NO2SSi | 详情 | 详情 |