Water → ethyl 2-methyl-3-oxo-1-oxa-8-azaspiro[4.5]decane-8-carboxylate

HRID 982337Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 982337
[CH2:1]([O:3][C:4]([N:6]1[CH2:22][CH2:21][C:9]2([O:13][CH:12]([CH3:14])[C:11](=[O:15])[CH:10]2C(OCC)=O)[CH2:8][CH2:7]1)=[O:5])[CH3:2].[Cl-].[Na+].O>CN(C)C=O>[CH2:1]([O:3][C:4]([N:6]1[CH2:7][CH2:8][C:9]2([O:13][CH:12]([CH3:14])[C:11](=[O:15])[CH2:10]2)[CH2:21][CH2:22]1)=[O:5])[CH3:2]

Komponenten

5

Edukt 3

HCID 962WaterHCID 5234Sodium ChlorideHCID 11723090Ethyl 8-ethoxycarbonyl-2-methyl-3-oxo-1-oxa-8-azaspiro[4,5]decane-4-carboxylate

Produkt 1

HCID 4588469ethyl 2-methyl-3-oxo-1-oxa-8-azaspiro[4.5]decane-8-carboxylateAusbeute 73 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6228DimethylformamideLösungsmittel

Versuchsvorschrift

To a solution of 2.74 g ethyl 8-ethoxycarbonyl-2-methyl-3-oxo-1-oxa-8-azaspiro[4,5]decane-4-carboxylate in 10 ml N,N-dimethylformamide, were added 512 mg sodium chloride and 315 μl water, and the mixture was heated with stirring for two hours in an oil bath held at 140-150° C. The reaction mixture was poured into 30 ml ice water, the resulting mixture was extracted with chloroform, and the extract was washed with an aqueous solution of sodium chloride and dried over anhydrous magnesium sulfate. After distilling off the solvent from the dried solution, the residue was purified by silica gel column chromatography using, as eluent, a mixed solvent of n-hexane/ethyl acetate (1:1 by volume), giving 1.54 g of 8-ethoxycarbonyl-2-methyl-1-oxa-8-azaspiro[4.5]-decan-3-one as oil.

Aufarbeitung

  1. temperaturethe mixture was heated
  2. customheld at 140-150° C
  3. extractionthe resulting mixture was extracted with chloroform
  4. washthe extract was washed with an aqueous solution of sodium chloride
  5. dry with materialdried over anhydrous magnesium sulfate
  6. distillationAfter distilling off the solvent from the dried solution
  7. customthe residue was purified by silica gel column chromatography

Quellen und Nachweise

ORD-Eintrag
ord-b2e739220c894ebfa38e775b04d68be5
Quelldatensatz
uspto-grants-1991_02
Patentnummer
US04996210

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