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【结 构 式】

【分子编号】49634

【品名】N-[(2R,3S)-2-(3-hydroxypropyl)-4-oxoazetidinyl]-2-phenoxyacetamide

【CA登记号】

【 分 子 式 】C14H18N2O4

【 分 子 量 】278.308

【元素组成】C 60.42% H 6.52% N 10.07% O 23%

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:(XIII)

The oxidation of 4-(benzyloxy)-1-butanol (I) with oxalyl chloride gives the corresponding aldehyde (II), which is condensed with the phosphonate (III) by means of DBU and LiCl in acetonitrile to yield the 2-hexenoate (IV). The asymmetric aminohydroxylation of (IV) by means of tert-butyl carbamate, K2[OsO2(OH)4] and a chiral catalyst ((DHQD)2PHAL) in propanol/water affords the desired regioisomer (V). The introduction of an azido group into the alpha-position with retention of the configuration was accomplished by two Mitsunobu reactions. The reaction of (V) with benzoic acid, PPh3 and DEAD in THF gives the benzoyloxy compound (VI) with inverted stereochemistry, which is hydrolyzed with K2CO3 in methanol to yield the corresponding alcohol (VII). Then the reaction of (VII) with HN3, DEAD and PPh3 in THF affords the azide (VIII) with the right stereochemistry. The hydrolysis of the ester group of (VIII) by means of K2CO3 in methanol/water, followed by cleavage of the protecting carbamate group with TFA, provides the carboxylic acid (IX). The cyclization of (IX) by means of 2-chloro-1-methylpyridinium iodide (CMPI) and TEA in acetonitrile gives the azetidinone (X), which is reduced with PPh3 in THF/water to yield the aminoazetidinone (XI). The acylation of the amino group of (XI) with 2-phenoxyacetyl chloride (A) and NaHCO3 in aqueous acetonitrile affords the amide (XII). The hydrogenation of (XII) with H2 over Pd/C in ethanol affords the primary alcohol (XIII), which is finally oxidized with the Jones reagent to provide the target carboxylic acid intermediate (XIV).

1 Lee, J.C.; et al.; An asymmetric aminohydroxylation approach to the stereoselective synthesis of cis-substituted azetidinone of loracarbef. Tetrahedron Lett 2001, 42, 27, 4519.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(A) 12180 Phenoxyacetyl chloride; 2-Phenoxyacetyl chloride 701-99-5 C8H7ClO2 详情 详情
(I) 46169 4-(benzyloxy)-1-butanol C11H16O2 详情 详情
(II) 46170 4-(benzyloxy)butanal C11H14O2 详情 详情
(III) 10019 Ethyl 2-(diethoxyphosphoryl)acetate; Triethyl phosphonoacetate 867-13-0 C8H17O5P 详情 详情
(IV) 49625 ethyl (E)-6-(benzyloxy)-2-hexenoate C15H20O3 详情 详情
(V) 49626 ethyl (2S,3R)-6-(benzyloxy)-3-[(tert-butoxycarbonyl)amino]-2-hydroxyhexanoate C20H31NO6 详情 详情
(VI) 49627 (1R,2R)-5-(benzyloxy)-2-[(tert-butoxycarbonyl)amino]-1-(ethoxycarbonyl)pentyl benzoate C27H35NO7 详情 详情
(VII) 49628 ethyl (2R,3R)-6-(benzyloxy)-3-[(tert-butoxycarbonyl)amino]-2-hydroxyhexanoate C20H31NO6 详情 详情
(VIII) 49629 ethyl (2S,3R)-2-azido-6-(benzyloxy)-3-[(tert-butoxycarbonyl)amino]hexanoate C20H30N4O5 详情 详情
(IX) 49630 (2S,3R)-3-amino-2-azido-6-(benzyloxy)hexanoic acid C13H18N4O3 详情 详情
(X) 49631 (3S,4R)-3-azido-4-[3-(benzyloxy)propyl]-2-azetidinone C13H16N4O2 详情 详情
(XI) 49632 (3S,4R)-3-amino-4-[3-(benzyloxy)propyl]-2-azetidinone C13H18N2O2 详情 详情
(XII) 49633 N-[(2R,3S)-2-[3-(benzyloxy)propyl]-4-oxoazetidinyl]-2-phenoxyacetamide C21H24N2O4 详情 详情
(XIII) 49634 N-[(2R,3S)-2-(3-hydroxypropyl)-4-oxoazetidinyl]-2-phenoxyacetamide C14H18N2O4 详情 详情
(XIV) 12182 3-[(2R,3S)-4-Oxo-3-[(2-phenoxyacetyl)amino]azetanyl]propionic acid C14H16N2O5 详情 详情
Extended Information