Acetic Acid → HCID 53730400, Verbindung

Diethyl oxalate (1.94 g, 13.2 mmol) and then a solution of 2-methyl-4-[N-methyl-N-[2-(2-tetrahydro-2H-pyranyl) oxyethyl]amino]-3-nitrobenzotrifluoride (2.40 g, 6.62 mmol) in tetrahydrofuran (40 ml) were added dropwise to a mixture of potassium ethoxide (1.11 g, 13.2 mmol) and tetrahydrofuran (60 ml) at room temperature. The reaction mixture was stirred at room temperature for 6 hours and then cooled to 3° C., and acetic acid (1.59 g, 26.5 mmol) was added dropwise. The reaction mixture thus obtained was poured into cold water and extracted twice with ethyl acetate. The extract solution was washed with a 5% aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the resulting residue was purified by a silica gel column chromatography (eluent: ethyl acetate/n-hexane= 1/9) to obtain an oil of ethyl [3-[N-methyl-N-[2-(2-tetrahydro-2H-pyranyl)oxyethyl]-amino]-2-nitro-6-trifluoromethylphenyl]pyruvate.

1. temperaturecooled to 3° C.
2. customThe reaction mixture thus obtained
3. extractionextracted twice with ethyl acetate
4. washThe extract solution was washed with a 5% aqueous sodium chloride solution
5. dry with materialdried over anhydrous magnesium sulfate
6. distillationThe solvent was distilled off under reduced pressure
7. customthe resulting residue was purified by a silica gel column chromatography (eluent: ethyl acetate/n-hexane= 1/9)

ORD-Eintrag

ord-e8fe0b56d2294ddf9f0d1e0e56f40c5e

Quelldatensatz

uspto-grants-1998_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05834454