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【结 构 式】

【分子编号】69411

【品名】tert-butyl ((3S,4R)-3-hydroxy-2,6-dimethylhept-1-en-4-yl)carbamate

【CA登记号】

【 分 子 式 】C14H27NO3

【 分 子 量 】257.37332

【元素组成】C 65.33% H 10.57% N 5.44% O 18.65%

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:(XXXIa)

Condensation of N-Boc-leucine (X) with N,O-dimethylhydroxylamine hydrochloride by means of i-BuOCOCl, NMM and Et3N in CH2Cl2 gives N-Boc-L-leucine Weinreb amide (XXVII) , which is then coupled with isopropenyl magnesium bromide (XXVIII) in THF (1) or 2-bromopropene (XXIX) in the presence of BuLi in Et2O at –78 °C to yield the heptenone derivative (XXX) . Reduction of heptenone (XXX) with NaBH4 and CeCl3·7H2O in MeOH results in a diastereomeric mixture of allylic alcohols (XXXIa) and (XXXIb), which is then epoxidized by treatment with mCPBA in CH2Cl2 to afford a mixture of oxiranes (XXXIIa) and (XXXIIb). Finally, this mixture is oxidized with Dess Martin periodinane in acetonitrile, followed by chromatographic separation . Compound (XXVI) can also be prepared by epoxidation of heptenone derivative (XXX) with H2O2 in the presence of PhCN and DIEA in MeOH or NaOCl in pyridine or Ca(OCl)2 in NMP , followed by separation by means of column chromatography .

2 Sin, N., Kim, K.B., Elofsson, M., Meng, L., Auth, H., Kwok, B.H.B., Crews, C.M. Total synthesis of the potent proteasome inhibitor epoximicin: A useful tool for understanding proteosome biology. Bioorg Med Chem Lett 1999, 9(15): 2283-8.
1 Phiasivongsa, P., Sehl, L.C., Fuller, W.D., Laidig, G.J. (Proteolix, Inc.). Crystalline peptide epoxy ketone protease inhibitors and the synthesis of amino acid keto-epoxides. WO 2009045497.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(XXXIa) 69411 tert-butyl ((3S,4R)-3-hydroxy-2,6-dimethylhept-1-en-4-yl)carbamate C14H27NO3 详情 详情
(XXXIb) 69412 tert-butyl ((3R,4R)-3-hydroxy-2,6-dimethylhept-1-en-4-yl)carbamate C14H27NO3 详情 详情
(XXXIIa) 69413 tert-butyl ((1R,2S)-1-hydroxy-4-methyl-1-(2-methyloxiran-2-yl)pentan-2-yl)carbamate C14H27NO4 详情 详情
(XXXIIb) 69414 tert-butyl ((1S,2S)-1-hydroxy-4-methyl-1-(2-methyloxiran-2-yl)pentan-2-yl)carbamate C14H27NO4 详情 详情
(X) 23663 (2S)-2-[(tert-butoxycarbonyl)amino]-4-methylpentanoic acid;N-Boc-L-leucine C11H21NO4 详情 详情
(XXVI) 43028 tert-butyl ((S)-4-methyl-1-((R)-2-methyloxiran-2-yl)-1-oxopentan-2-yl)carbamate;tert-butyl (1S)-3-methyl-1-[[(2R)-2-methyloxiranyl]carbonyl]butylcarbamate C14H25NO4 详情 详情
(XXVII) 40395 tert-butyl (1S)-1-[[methoxy(methyl)amino]carbonyl]-3-methylbutylcarbamate C13H26N2O4 详情 详情
(XXVIII) 43649 bromo(isopropenyl)magnesium;isopropenyl magnesium bromide;1-Methylvinylmagnesiumbromide;1-Propen-2-ylmagnesium bromide;a-Methylvinylmagnesium bromide 13291-18-4 C3H5BrMg 详情 详情
(XXIX) 42375 2-bromo-1-propene;2-bromopropene;Isopropenyl bromide;a-Methylvinyl bromide 557-93-7 C3H5Br 详情 详情
(XXX) 43027 tert-butyl (1S)-1-isobutyl-3-methyl-2-oxo-3-butenylcarbamate C14H25NO3 详情 详情
Extended Information