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

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%).

1. additionAfter the addition the mixture
2. stirringstirred for 10 minutes
3. extractionextracted with ethyl acetate (3×200 ml)
4. dry with materialThe combined organic extracts were dried over magnesium sulphate
5. customevaporated
6. customThe residue was chromatographed
7. washeluting with 0-50% dichloromethane in hexane affording the product as a white solid (3.72 g, 57%)

ORD record

ord-bafbb154d86e4eac85d553a85bf98cb2

Source dataset

uspto-grants-2010_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07732460B2