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【结 构 式】

【分子编号】43583

【品名】methyl (2R,4R)-3-benzyl-2-(tert-butyl)-4-(1-hydroxy-2-methylpropyl)-1,3-oxazolidine-4-carboxylate

【CA登记号】

【 分 子 式 】C20H31NO4

【 分 子 量 】349.47048

【元素组成】C 68.74% H 8.94% N 4.01% O 18.31%

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:(III)

Treatment of cis-oxazolidine derivative (I) with isobutyraldehyde (II), LDA and LiBr in THF yields aldol product (III), which is then converted into (IV) by first aminal cleavage by means of MeOH and TfOH, followed by silylation with Tbdms-Cl and imidazole in DMF. Reaction of (IV) with formaldehyde and TsOH in benzene gives oxazolidine system (V), which is then first reduced with LiBH4 in THF/MeOH and then oxidized by means of DMSO, oxalyl chloride and Et3N in CH2Cl2 to provide aldehyde (VI). Mukaiyama aldol coupling of (VI) and (VII) in CH2Cl2 with MgI2 as catalyst, followed by treatment with K2CO3 in MeOH, yields aldol product (VIII), which is then converted into hydroxy lactam (IX) by the sequence: i) N-benzyl cleavage by hydrogenolysis over Pd/C in EtOH in the presence of DIEA; ii) ring closure by heating in MeOH; and iii) desilylation by treatment with HF in acetonitrile. Conversion of alcohol (IX) into dihydroxy acid (X) is achieved by a first oxidation with DMSO, oxalyl chloride and Et3N in CH2Cl2, followed by reaction with NaClO2, NaH2PO4 in t-BuOH and 2-Me-butene and final N/O methylene bridge removal with 1,3-propanedithiol (A) catalyzed by HCl and TFA. Compound (X) undergoes beta-lactonization to omuralide (XI) by means of BOPCl and Et3N in CH2Cl2 and finally (XI) is coupled to N-acetyl-L-cysteine (XII) in CH2Cl2 in the presence of Et3N.

1 Corey, E.J.; Li, W.-D.Z.; Total synthesis and biological activity of lactacystin, omuralide and analogs. Chem Pharm Bull 1999, 47, 1, 1.
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) 29729 1,3-propanedithiol; 3-sulfanylpropylhydrosulfide 109-80-8 C3H8S2 详情 详情
(I) 43582 methyl (2R,4S)-3-benzyl-2-(tert-butyl)-1,3-oxazolidine-4-carboxylate C16H23NO3 详情 详情
(II) 13226 2-Methylpropanal; Isobutyraldehyde 78-84-2 C4H8O 详情 详情
(III) 43583 methyl (2R,4R)-3-benzyl-2-(tert-butyl)-4-(1-hydroxy-2-methylpropyl)-1,3-oxazolidine-4-carboxylate C20H31NO4 详情 详情
(IV) 43584 methyl (2R,3S)-2-(benzylamino)-2-([[tert-butyl(dimethyl)silyl]oxy]methyl)-3-hydroxy-4-methylpentanoate C21H37NO4Si 详情 详情
(V) 43585 methyl (4R,5S)-3-benzyl-4-([[tert-butyl(dimethyl)silyl]oxy]methyl)-5-isopropyl-1,3-oxazolidine-4-carboxylate C22H37NO4Si 详情 详情
(VI) 43586 (4R,5S)-3-benzyl-4-([[tert-butyl(dimethyl)silyl]oxy]methyl)-5-isopropyl-1,3-oxazolidine-4-carbaldehyde C21H35NO3Si 详情 详情
(VII) 43587 (E)-1-methoxy-1-propenyl trimethylsilyl ether; [[(E)-1-methoxy-1-propenyl]oxy](trimethyl)silane 34880-70-1 C7H16O2Si 详情 详情
(VIII) 43588 methyl (2R,3S)-3-[(4S,5S)-3-benzyl-4-([[tert-butyl(dimethyl)silyl]oxy]methyl)-5-isopropyl-1,3-oxazolidin-4-yl]-3-hydroxy-2-methylpropanoate C25H43NO5Si 详情 详情
(IX) 43589 (1S,6R,7S,7aS)-7-hydroxy-7a-(hydroxymethyl)-1-isopropyl-6-methyltetrahydro-5H-pyrrolo[1,2-c][1,3]oxazol-5-one C11H19NO4 详情 详情
(X) 43590 (2R,3S,4R)-3-hydroxy-2-[(1S)-1-hydroxy-2-methylpropyl]-4-methyl-5-oxo-2-pyrrolidinecarboxylic acid C10H17NO5 详情 详情
(XI) 43591 (1R,4R,5S)-1-[(1S)-1-hydroxy-2-methylpropyl]-4-methyl-6-oxa-2-azabicyclo[3.2.0]heptane-3,7-dione C10H15NO4 详情 详情
(XII) 43592 (2R)-2-(acetamido)-3-sulfanylpropionic acid C5H9NO3S 详情 详情
Extended Information