Reaktion #43409

Reaktionsgleichung

1-(chloromethyl)-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate)

1,1-dimethylethyl [2-[1-(ethyloxy)ethenyl]-5-fluoro-6-(methyloxy)-3-pyridinyl]carbamate

acetonitrile

sodium bicarbonate

sodium bicarbonate

→

1,1-Dimethylethyl [5-fluoro-2-(fluoroacetyl)-6-(methyloxy)-3-pyridinyl]carbamate

Lösungsmittel

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONAfter the addition the mixture
2. 2
   workup.STIRRINGstirred for 10 minutes
3. 3
   Extraktionextracted with ethyl acetate (3×200 ml)
4. 4
   TrocknenThe combined organic extracts were dried over magnesium sulphate
5. 5
   Sonstigeevaporated
6. 6
   SonstigeThe residue was chromatographed
7. 7
   Wascheneluting with 0-50% dichloromethane in hexane affording the product as a white solid (3.72 g, 57%)

Vorschrift

A mixture of 1,1-dimethylethyl [2-[1-(ethyloxy)ethenyl]-5-fluoro-6-(methyloxy)-3-pyridinyl]carbamate (6.72 g, 21.54 mmol), acetonitrile (70 ml), and saturated aqueous sodium bicarbonate solution (15 ml) was treated portionwise over 5 minutes at 0° C. under argon with [1-(chloromethyl)-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate) (Selectfluor™) (8.9 g, 25.05 mmol). After the addition the mixture was stirred at room temperature for 0.5 hour then treated with saturated aqueous sodium bicarbonate solution (50 ml), stirred for 10 minutes, then diluted with water (100 ml) and extracted with ethyl acetate (3×200 ml). The combined organic extracts were dried over magnesium sulphate and evaporated. The residue was chromatographed eluting with 0-50% dichloromethane in hexane affording the product as a white solid (3.72 g, 57%).

Quelle