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Benzoin → Methyl 4,5-diphenyl-2-oxazoleoctanoate

HRID 257618
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 257618
[C:1]1([C:7]([CH:9]([C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=2)O)=[O:8])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[CH3:17][O:18][C:19](=[O:30])[CH2:20][CH2:21][CH2:22][CH2:23][CH2:24][CH2:25][CH2:26][C:27](O)=O.C1([N:37]=C=NC2CCCCC2)CCCCC1.C([O-])(=O)C.[NH4+]>CN(C)C1C=CN=CC=1.O.C(O)(=O)C.ClCCl>[C:11]1([C:9]2[N:37]=[C:27]([CH2:26][CH2:25][CH2:24][CH2:23][CH2:22][CH2:21][CH2:20][C:19]([O:18][CH3:17])=[O:30])[O:8][C:7]=2[C:1]2[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=2)[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1
KomponentenVersuchsvorschriftAufarbeitungQuellen und NachweiseNotizen zur Reaktion

Komponenten

9

Edukt 4

HCID 8400BenzoinHCID 10868DicyclohexylcarbodiimideHCID 75009Monomethyl azelateHCID 517165Ammonium Acetate

Produkt 1

HCID 15232721Methyl 4,5-diphenyl-2-oxazoleoctanoateAusbeute 78 %

Reagenzien, Katalysatoren, Lösungsmittel 4

HCID 14284
4-(Dimethylamino)pyridine
Katalysator
HCID 176Acetic AcidLösungsmittel
HCID 962WaterLösungsmittel
HCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

A mixture of benzoin (6.00 g, 28 mmol), azelaic acid monomethyl ester (7.17 g of 92% pure material, 32 mmol), 1,3-dicyclohexylcarbodiimide (7.00 g, 34 mmol), 4-dimethylaminopyridine (catalytic amount) and dichloromethane (120 mL) was stirred at room temperature. After 16 hours, the mixture was filtered and the solvent evaporated. Ammonium acetate (10.90 g, 141 mmol) and acetic acid (150 mL) were added to the residue and the mixture heated at reflux for 65 minutes before being cooled and diluted with water. The mixture was extracted with diethyl ether, the combined extracts dried over sodium sulfate and concentrated in vacuo. The residual oil was chromatographed on a column of silica gel using a mixture of hexanes and diethyl ether (7:3) as eluent to give methyl 4,5-diphenyl-2-oxazoleoctanoate (8.24 g, 77%) as an oil.

Aufarbeitung

  1. filtrationthe mixture was filtered
  2. customthe solvent evaporated
  3. temperaturethe mixture heated
  4. temperatureat reflux for 65 minutes
  5. temperaturebefore being cooled
  6. extractionThe mixture was extracted with diethyl ether
  7. dry with materialthe combined extracts dried over sodium sulfate
  8. concentrationconcentrated in vacuo
  9. customThe residual oil was chromatographed on a column of silica gel using
  10. additiona mixture of hexanes and diethyl ether (7:3) as eluent

Quellen und Nachweise

ORD-Eintrag
ord-1e7f1509404b4317bcfb630e66fb2d25
Quelldatensatz
uspto-grants-1993_11
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US05262540

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