Reaktion #8406

Reaktionsgleichung

3-methyl-5-phenyl-isoxazole-4-carboxylic acid methylamide

butyl lithium

benzonitrile

→

5-methyl-3,6-diphenyl-5H-isoxazolo[4,3-c]pyridin-4-one

Ausbeute 48.9%

Lösungsmittel

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturUnder warming to room temperature
2. 2
   Sonstigequenched with 0.1 ml of water
3. 3
   Einengenconcentrated
4. 4
   workup.STIRRINGthe suspension stirred for 16 h at room temperature
5. 5
   SonstigeThen, the solvent is removed
6. 6
   workup.DISSOLUTIONthe residue dissolved in ethyl acetate
7. 7
   SonstigeThe phases are separated
8. 8
   Waschenthe organic phases washed with brine
9. 9
   Trocknendried over Na2SO4
10. 10
    Einengenconcentrated
11. 11
    SonstigeChromatographic purification (hexane/ethyl acetate 90:10)

Vorschrift

159 mg (0.73 mmol) of 3-methyl-5-phenyl-isoxazole-4-carboxylic acid methylamide is suspended in 4 ml of THF under argon. At −5° C. a solution of butyl lithium (1.0 ml, 1.6M in hexane, 1.6 mmol, 2.2 eq.) is slowly added. After 1 h at this temperature, the solution is warmed to 0° C. and 0.92 ml (0.88 mmol, 1.2 eq.) of benzonitrile is slowly added. Under warming to room temperature, the red solution is stirred for another 2 h, then quenched with 0.1 ml of water and concentrated. The residue is then taken up in 4 ml of a 4M solution of HCl in dioxane and the suspension stirred for 16 h at room temperature. Then, the solvent is removed and the residue dissolved in ethyl acetate and carefully neutralised with sat. NaHCO3-solution. The phases are separated and the organic phases washed with brine, dried over Na2SO4 and concentrated. Chromatographic purification (hexane/ethyl acetate 90:10) yields 108 mg (48%) of 5-methyl-3,6-diphenyl-5H-isoxazolo[4,3-c]pyridin-4-one as a white solid. Mass spectrum: m/z (M+H)+: 303.2

Quelle