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【结 构 式】 
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【分子编号】21740 【品名】(3R,4S)-1-(4-hydroxyphenyl)-4-(2-methyl-1-propenyl)-3-[(triisopropylsilyl)oxy]-2-azetidinone 【CA登记号】 |
【 分 子 式 】C22H35NO3Si 【 分 子 量 】389.61034 【元素组成】C 67.82% H 9.05% N 3.6% O 12.32% Si 7.21% |
合成路线1
该中间体在本合成路线中的序号：(IV)Lithium enolate (II), generated from chiral ester (I) and LDA at -84 C, was cyclocondensed with imine (III) to furnish azetidinone (IV). After removal of the triisopropylsilyl group of (IV) using HF in pyridine, the resulting lactam was treated with CH2I2 and Et2Zn in 1,2-dichloroethane to give the dimethylcyclopropyl azetidinone (V). The C-3 hydroxyl group was reprotected as the triisopropylsilyl ether (VI). Then, the N-p-methoxyphenyl group of (VI) was removed by oxidative treatment with ceric ammonium nitrate at -10 C, and the resulting azetidinone was N-protected with Boc2O to afford tert-butyl carbamate (VII).
| 【1】 Lin, S.; et al.; Syntheses and biological activity of advanced second-generation taxoids. 216th ACS Natl Meet (Aug. 23-27, Boston) 1998, Abst MEDI 315. |
| 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) | 19161 | (1S,2S,3R,4S,7R,9S,10S,12R,15R,16S)-4,12-bis(acetoxy)-15-hydroxy-10,14,20,20-tetramethyl-11,18-dioxo-9-[(triethylsilyl)oxy]-6,17,19-trioxapentacyclo[11.6.1.0(1,16).0(3,10).0(4,7)]icos-13-en-2-yl benzoate | C38H50O13Si | 详情 | 详情 | |
| (II) | 21730 | 2-(Triisopropylsilyloxy)-1-(2(S)-phenyl-1(R)-cyclohexyl)vinyl-1-ol lithium salt | C23H37LiO3Si | 详情 | 详情 | |
| (IV) | 21740 | (3R,4S)-1-(4-hydroxyphenyl)-4-(2-methyl-1-propenyl)-3-[(triisopropylsilyl)oxy]-2-azetidinone | C22H35NO3Si | 详情 | 详情 | |
| (V) | 21741 | (3R,4S)-4-[(1S)-2,2-dimethylcyclopropyl]-3-hydroxy-1-(4-methoxyphenyl)-2-azetidinone | C15H19NO3 | 详情 | 详情 | |
| (VI) | 21742 | (3R,4S)-4-[(1S)-2,2-dimethylcyclopropyl]-1-(4-methoxyphenyl)-3-[(triisopropylsilyl)oxy]-2-azetidinone | C24H39NO3Si | 详情 | 详情 | |
| (VII) | 21743 | tert-butyl (2S,3R)-2-[(1S)-2,2-dimethylcyclopropyl]-4-oxo-3-[(triisopropylsilyl)oxy]-1-azetidinecarboxylate | C22H41NO4Si | 详情 | 详情 |