反应详情

温度

130 °C

A mixture of 4-chloropyridinium hydrochloride (25.0 g, 166 mmol), benzotriazole (29.6 g, 249 mmol), potassium carbonate (69.1 g, 500 mmol), and dimethylformamide (500 mL) was stirred and heated under argon at 130° C. for 3 days. After cooling, the solid was filtered off, and the solvent was evaporated under reduced pressure. The residue was treated with dichloromethane (200 mL), filtered and chromatographed using a column filled with silica gel (500 mL) and hexane/ethyl acetate (1:1) as an eluent. Fractions containing the desired product were combined, and the solvent was distilled off. The residue was triturated with ethanol, the solid was filtered off and dried in a vacuum oven to give 2-(pyridin-4-yl)-2H-benzo[d][1,2,3]triazole, 6.45 (20%). 1H NMR (400 MHz, CDCl3): δ 8.80 (m, 2H, pyridine), 8.26 (m, 2H, pyridine), 7.93 (m, 2H, benzotriazole), 7.46 (m, 2H, benzotriazole).

1. temperatureAfter cooling
2. filtrationthe solid was filtered off
3. customthe solvent was evaporated under reduced pressure
4. additionThe residue was treated with dichloromethane (200 mL)
5. filtrationfiltered
6. customchromatographed
7. additionfilled with silica gel (500 mL) and hexane/ethyl acetate (1:1) as an eluent
8. additionFractions containing the desired product
9. distillationthe solvent was distilled off
10. customThe residue was triturated with ethanol
11. filtrationthe solid was filtered off
12. customdried in a vacuum oven