Reacción #43409

Ecuación de reacción

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

Disolventes

water

Condiciones de reacción

Tratamiento posterior

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

Procedimiento

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%).

Fuente