4-Nitropyridine N-oxide → 4-Ethoxypyridine n-oxide

Temperature

50 °C

4-nitropyridine-N-oxide (12 g) was dissolved in ethanol, sodium ethoxide (8.8 g) was added to the mixture, and the mixture was stirred for 40 hours at 50° C. After allowing the mixture to be cooled to room temperature, the precipitates were filtered, the solvent was removed under reduced pressure, and the obtained residue was purified by silica gel column chromatography, to give 4-ethoxypyridine-N-oxide (11.8 g). To 4-ethoxypyridine-N-oxide (11.8 g) was added dimethyl sulfate (8.56 ml), and the mixture was stirred for 1 hour at 110° C. After diluting with methanol (180 ml), the mixture was heated to reflux for 1 hour, an aqueous solution (18 ml) of ammonium peroxodisulfate (20.6 g) was added dropwise to the solution under heat reflux, and the mixture was heated to reflux for 1 hour. After allowing the mixture to be cooled to room temperature, the solvent was removed under reduced pressure, and the obtained residue was purified by silica gel column chromatography, to give (4-ethoxy-2-pyridinyl)methanol (2.8 g).

1. temperatureto be cooled to room temperature
2. filtrationthe precipitates were filtered
3. customthe solvent was removed under reduced pressure
4. customthe obtained residue was purified by silica gel column chromatography

ORD record

ord-ea5cc24d7f8e45ab98589abaa1ff7bc6

Source dataset

uspto-grants-2007_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07262185B2