反应详情

温度

120 °C

4-Trifluoromethylbenzylalcohol (4.2 g, 23 mmol) was dissolved in DMF (20 mL) and NaH (60% weight dispersion in mineral oil, 0.92 g, 23 mmol) was added. After stirring for 30 minutes, 4-chloropyridine-N-oxide (1.5 g, 11.5 mmol) was added and the reaction mixture was heated for 1 h at 120° C. Upon cooling the mixture was diluted with methylene chloride and washed with 5% lithium chloride solution (5×), dried and concentrated. Purification by flash column chromatography (40 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 90% methylene chloride over 30 min at 40 mL/min) provided the title compound (0.6 g, 19%) as a yellow solid: 1H NMR (300 MHz, CDCl3) δ 8.14 (d, J=7.8 Hz, 2H), 7.68 (d, J=8.1 Hz, 2H), 7.52 (d, J=8.1 Hz, 2H), 6.86 (d, J=7.8 Hz, 2H), 5.15 (s, 2H).

1. temperatureUpon cooling the mixture
2. washwashed with 5% lithium chloride solution (5×)
3. customdried
4. concentrationconcentrated
5. customPurification by flash column chromatography (40 g ISCO column
6. washeluting with methylene chloride