Dimethylformamide → 3-methyl-5-(4-nitrobenzyl)-1,3,4-oxadiazol-2(3H)-one

HRID 30668Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 30668
[N+:1]([C:4]1[CH:16]=[CH:15][C:7]([CH2:8][C:9]2[O:13][C:12](=[O:14])[NH:11][N:10]=2)=[CH:6][CH:5]=1)([O-:3])=[O:2].IC.[CH3:19]N(C)C=O.[H-].[Na+]>O>[CH3:19][N:11]1[N:10]=[C:9]([CH2:8][C:7]2[CH:15]=[CH:16][C:4]([N+:1]([O-:3])=[O:2])=[CH:5][CH:6]=2)[O:13][C:12]1=[O:14]

Komponenten

6

Edukt 4

HCID 6228DimethylformamideHCID 6328Methyl iodideHCID 24758Sodium hydrideHCID 218227135-(4-nitrobenzyl)-1,3,4-oxadiazol-2(3H)-one

Produkt 1

HCID 218134333-methyl-5-(4-nitrobenzyl)-1,3,4-oxadiazol-2(3H)-oneAusbeute 71 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 962WaterLösungsmittel

Versuchsvorschrift

To a mixture of 5-(4-nitrobenzyl)-1,3,4-oxadiazol-2(3H)-one (1.0 g), iodomethane (0.97 g) and N,N-dimethylformamide (30 mL) was added sodium hydride (60% in oil, 0.20 g) at room temperature. The reaction mixture was stirred at room temperature for 2 hrs. Water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to give 3-methyl-5-(4-nitrobenzyl)-1,3,4-oxadiazol-2(3H)-one as colorless crystals (0.75 g, yield 71%) from a fraction eluted with hexane-ethyl acetate (3:1-2:1, v/v). Recrystallization thereof from ethyl acetate-hexane gave colorless prism crystals. melting point: 115-116° C.

Aufarbeitung

  1. extractionthe mixture was extracted with ethyl acetate
  2. washThe organic layer was washed with saturated brine
  3. dry with materialdried over anhydrous magnesium sulfate
  4. concentrationconcentrated

Quellen und Nachweise

ORD-Eintrag
ord-1f863b11ca6549b9894b65617e04ced5
Quelldatensatz
uspto-grants-2008_09
Patentnummer
US07423159B2

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