Ammonium Hydroxide → 6-Methoxy-3-nitro-2-(trifluoromethyl)pyridine

Temperatur

120 °C

To a solution of 2-chloro-6-methoxy-3-nitropyridine (0.6 g, 3.2 mmol) in DMF (1.2 mL) were added CuI (0.73 g, 3.8 mmol) and KF (0.37 g, 6.4 mmol), followed by methyl chlorodifluoroacetate (1.15 g, 7.97 mmol). The reaction mixture was heated for 13 h at 120° C. The reaction mixture was then cooled to room temperature and poured onto a mixture of NH4OH and saturated aqueous NH4Cl solution (1:1). The resulting solution was stirred for 1.5 h at room temperature. The organic layer was washed with water and brine, dried over sodium sulphate and concentrated. The crude material obtained was purified by column chromatography (silica: 100-200 mesh, DCM:hexane 3-4%) to afford the title compound (0.5 g, 71%) as a colourless oil. δH (CDCl3) 8.17 (d, J=8.9 Hz, 1H), 7.03 (d, J=8.9 Hz, 1H), 4.09 (s, 3H).

1. temperatureThe reaction mixture was then cooled to room temperature
2. washThe organic layer was washed with water and brine
3. dry with materialdried over sodium sulphate
4. concentrationconcentrated
5. customThe crude material obtained
6. customwas purified by column chromatography (silica: 100-200 mesh, DCM:hexane 3-4%)

ORD-Eintrag

ord-20f1d5bb6db44960b8a8a0d4181a0de5

Quelldatensatz

uspto-grants-2015_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09096614B2