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【结 构 式】

【分子编号】54840

【品名】(3S,4R)-3-((1R)-1-{[tert-butyl(dimethyl)silyl]oxy}ethyl)-4-(methylsulfanyl)-2-azetidinone

【CA登记号】

【 分 子 式 】C12H25NO2SSi

【 分 子 量 】275.48754

【元素组成】C 52.32% H 9.15% N 5.08% O 11.62% S 11.64% Si 10.19%

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:(II)

Azetidinone acetate (I) was treated with sodium methanethiolate to produce thioether (II). Lactam (II) N-alkylation with p-nitrobenzyl iodoacetate (III) furnished the azetidineacetate (IV). The lithium enolate of ester (IV) was subsequently acylated with pivaloyl chloride (V) at low temperature to afford keto ester (VI). The silyl protecting group of (VI) was then removed by treatment with tetrabutylammonium fluoride, yielding alcohol (VII). Chlorination of (VII) with concomitant oxidative cleavage of the methylthio group at -78 C gave rise to the chloroazetidine (VIII). Cyclization of (VIII) to the key oxapenem bicyclic system was accomplished by treatment with triethylamine in cold THF. Chromatographic separation of the resultant mixture of cis/trans bicyclic compounds afforded the desired isomer (IX). After hydrogenolysis of the p-nitrobenzyl ester group of (IX), the resultant carboxylic acid was converted to the required potassium salt by treatment with aqueous potassium bicarbonate.

1 Pfaendler, H.R.; Weisner, F.; Synthesis and antibacterial activity of 1'R,5R,6R)-2-tert-butyl-6-(1'hydroxyethyl)oxapenem-3-carboxylic acid. Bioorg Med Chem Lett 1993, 3, 11, 2211.
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) 11687 (2R,3R)-3-((1R)-1-[[tert-butyl(dimethyl)silyl]oxy]ethyl)-4-oxoazetanyl acetate C13H25NO4Si 详情 详情
(II) 54840 (3S,4R)-3-((1R)-1-{[tert-butyl(dimethyl)silyl]oxy}ethyl)-4-(methylsulfanyl)-2-azetidinone C12H25NO2SSi 详情 详情
(III) 54841 4-nitrobenzyl 2-iodoacetate C9H8INO4 详情 详情
(IV) 54842 4-nitrobenzyl 2-[(2R,3S)-3-((1R)-1-{[tert-butyl(dimethyl)silyl]oxy}ethyl)-2-(methylsulfanyl)-4-oxoazetidinyl]acetate C21H32N2O6SSi 详情 详情
(V) 13597 2,2-Dimethylpropanoyl chloride; Pivaloyl chloride 3282-30-2 C5H9ClO 详情 详情
(VI) 54843 4-nitrobenzyl 2-[(2R,3S)-3-((1R)-1-{[tert-butyl(dimethyl)silyl]oxy}ethyl)-2-(methylsulfanyl)-4-oxoazetidinyl]-4,4-dimethyl-3-oxopentanoate C26H40N2O7SSi 详情 详情
(VII) 54844 4-nitrobenzyl 2-[(2R,3S)-3-[(1R)-1-hydroxyethyl]-2-(methylsulfanyl)-4-oxoazetidinyl]-4,4-dimethyl-3-oxopentanoate C20H26N2O7S 详情 详情
(VIII) 54845 4-nitrobenzyl 2-{(2R,3S)-2-chloro-3-[(1R)-1-hydroxyethyl]-4-oxoazetidinyl}-4,4-dimethyl-3-oxopentanoate C19H23ClN2O7 详情 详情
(IX) 54846 4-nitrobenzyl 2-{(2S,3S)-2-chloro-3-[(1R)-1-hydroxyethyl]-4-oxoazetidinyl}-4,4-dimethyl-3-oxopentanoate C19H23ClN2O7 详情 详情
(X) 54847 4-nitrobenzyl (5R,6R)-3-(tert-butyl)-6-[(1R)-1-hydroxyethyl]-7-oxo-4-oxa-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate C19H22N2O7 详情 详情
Extended Information