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Ethyl bromoacetate → (3S-cis)-Hexahydro-3-[[(1,1-dimethylethoxy)-carbonyl]amino]-7-methyl-2-oxo-1H-azepine-1-acetic acid, ethyl ester

HRID 264982
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Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 264982
[CH3:1][C:2]([CH3:17])([O:4][C:5]([NH:7][C@H:8]1[CH2:14][CH2:13][CH2:12][C@@H:11]([CH3:15])[NH:10][C:9]1=[O:16])=[O:6])[CH3:3].C[Si]([N-][Si](C)(C)C)(C)C.[Li+].Br[CH2:29][C:30]([O:32][CH2:33][CH3:34])=[O:31]>O1CCCC1>[CH3:3][C:2]([CH3:1])([O:4][C:5]([NH:7][C@H:8]1[CH2:14][CH2:13][CH2:12][C@@H:11]([CH3:15])[N:10]([CH2:29][C:30]([O:32][CH2:33][CH3:34])=[O:31])[C:9]1=[O:16])=[O:6])[CH3:17]
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Komponenten

5

Edukt 3

HCID 7748Ethyl bromoacetateHCID 2733832Lithium hexamethyldisilazaneHCID 14927375(3S-cis)-hexahydro-3-[[(1,1-dimethylethoxy)carbonyl]amino]-7-methyl-2H-azepin-2-one

Produkt 1

HCID 14927378(3S-cis)-Hexahydro-3-[[(1,1-dimethylethoxy)-carbonyl]amino]-7-methyl-2-oxo-1H-azepine-1-acetic acid, ethyl ester

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028
Tetrahydrofuran
Lösungsmittel
2×

Versuchsvorschrift

A solution of (3S-cis)-hexahydro-3-[[(1,1-dimethylethoxy)carbonyl]amino]-7-methyl-2H-azepin-2-one [prepared as described in Example 64(f), 500 mg., 2.06 mmol.] in tetrahydrofuran (13 ml.) at room temperature under argon was treated dropwise with 1.0M lithium bis(trimethylsilyl)amide in tetrahydrofuran (2.7 ml., 2.7 mmol.) immediately followed by the dropwise addition of ethyl bromoacetate (0.47 ml., 4.21 mmol.). The resulting mixture was stirred for 30 minutes, quenched with aqueous ammonium chloride, diluted with water and extracted twice with ethyl acetate. The combined organic layers were washed with brine, dried (sodium sulfate), filtered and concentrated to a yellow oil. Following flash chromatography (E Merck silica gel) eluting with 2:1 hexane/ethyl acetate, 750 mg. of title product was obtained as a light yellow oil; TLC (1:1 ethyl acetate:hexane) Rf =0.52.

Aufarbeitung

  1. customquenched with aqueous ammonium chloride
  2. additiondiluted with water
  3. extractionextracted twice with ethyl acetate
  4. washThe combined organic layers were washed with brine
  5. dry with materialdried (sodium sulfate)
  6. filtrationfiltered
  7. concentrationconcentrated to a yellow oil
  8. washeluting with 2:1 hexane/ethyl acetate, 750 mg

Quellen und Nachweise

ORD-Eintrag
ord-4ef4861472dc445eb32c538b452a4b4a
Quelldatensatz
uspto-grants-1997_07
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US05646276

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