反应详情

温度

60 °C

A stirred mixture of bromoacetaldehyde diethyl acetal (2.30 ml, 14.8 mmol) in concentrated hydrobromic acid (0.73 ml) and water (0.73 ml) was heated at reflux for 2 h, then poured into ethanol (25 ml). The solution was neutralised to pH 7 with solid sodium hydrogencarbonate, then filtered. To the filtrate was added 3-amino-5-trifluoromethyl-1,2,4-triazine (1.0079 g, 6.14 mmol) and the mixture was stirred at 60° C. for 20 h, then 80° C. for 23 h. The mixture was evaporated in vacuo, and the residue was purified by flash chromatography (silica gel, 35–50% EtOAc/isohexane) to give 0.2593 g (22%) of the title compound: 1H NMR (360 MHz, CDCl3) δ 8.20 (1H, d, J 0.8), 8.30 (1H, d, J 0.9), 8.73 (1H, s).

1. temperaturewas heated
2. temperatureat reflux for 2 h
3. filtrationfiltered
4. wait80° C. for 23 h
5. customThe mixture was evaporated in vacuo
6. customthe residue was purified by flash chromatography (silica gel, 35–50% EtOAc/isohexane)