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【结 构 式】

【分子编号】43834

【品名】methyl (2R,3S)-3-amino-3-phenyl-2-[(triethylsilyl)oxy]propanoate

【CA登记号】

【 分 子 式 】C16H27NO3Si

【 分 子 量 】309.48082

【元素组成】C 62.1% H 8.79% N 4.53% O 15.51% Si 9.08%

与该中间体有关的原料药合成路线共 1 条

合成路线1

该中间体在本合成路线中的序号:(XI)

A new synthesis of (3R,4S)-1-benzyl-4-phenyl-3-(triethylsilyloxy)azetidin-2-one (XIII), a precursor of the side chain of paclitaxel, has been described: The reaction of ethyl L-tartrate (I) with benzaldehyde and TsOH followed, by reduction with LiAlH4 and AlCl3 gives the monobenzylated tretraol (II), which is submitted to an oxidative cleavage of the alpha-diol bond with NaIO4 to yield the aldehyde (III). Reaction of (III) with benzylamine affords the imine (IV), which is submitted to a Grignard addition of phenylmagnesium bromide in ether providing a 1:9 mixture of aminoalcohols (VI) and (VII) separated by chromatography. Oxidation of the desired major isomer (VII) with CrO3/H2SO4 gives the corresponding acid (VIII), which is then esterified with TMS-Cl in refluxing methanol to the methyl ester (IX). Deprotection of compound (IX) by hydrogenolysis with reluxing HCO2H over Pd/C yields 3(S)-amino-2(R)-hydroxy-3-phenylpropionic acid methyl ester (X), which is silylated at the OH group of with TES-Cl and TEA in ether/THF to afford the silyl ether (XI). Cyclization of (XI) by means of LHMDS in THF provides the beta-lactam (XII), which is finally benzoylated with benzoyl chloride and TEA in the usual way.

1 Kim, H.-K.; Kim, S.-C.; Synthesis of new Taxol side chain precursor from L-tartaric ester. Bull Korean Chem Soc 2000, 21, 10, 1047.
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) 16696 Diethyl L-(+)-Tartrate; diethyl (2S,3S)-2,3-dihydroxybutanedioate 87-91-2 C8H14O6 详情 详情
(II) 43826 (2S,3S)-3-(benzyloxy)-1,2,4-butanetriol C11H16O4 详情 详情
(III) 43827 (2S)-2-(benzyloxy)-3-hydroxypropanal C10H12O3 详情 详情
(IV) 15147 Benzylamine; Phenylmethanamine 100-46-9 C7H9N 详情 详情
(V) 43828 (2R)-3-(benzylimino)-2-(benzyloxy)-1-propanol C17H19NO2 详情 详情
(VI) 43829 (2R,3R)-3-(benzylamino)-2-(benzyloxy)-3-phenyl-1-propanol C23H25NO2 详情 详情
(VII) 43830 (2R,3S)-3-(benzylamino)-2-(benzyloxy)-3-phenyl-1-propanol C23H25NO2 详情 详情
(VIII) 43831 (2R,3S)-3-(benzylamino)-2-(benzyloxy)-3-phenylpropionic acid C23H23NO3 详情 详情
(IX) 43832 methyl (2R,3S)-3-(benzylamino)-2-(benzyloxy)-3-phenylpropanoate C24H25NO3 详情 详情
(X) 43833 methyl (2R,3S)-3-amino-2-hydroxy-3-phenylpropanoate C10H13NO3 详情 详情
(XI) 43834 methyl (2R,3S)-3-amino-3-phenyl-2-[(triethylsilyl)oxy]propanoate C16H27NO3Si 详情 详情
(XII) 10685 (3R,4S)-4-Phenyl-3-[(triethylsilyl)oxy]-2-azetidinone C15H23NO2Si 详情 详情
(XIII) 10490 (3R,4S)-1-Benzoyl-4-phenyl-3-[(triethylsilyl)oxy]-2-azetanone C22H27NO3Si 详情 详情
Extended Information