反应详情

温度

100 °C

A mixture of 2,6-dichloroquinoxaline (0.99 g 0.005 mole), ethyl 2-(2-fluoro-4-hydroxyphenoxy)propionate (1.14 g, 0.005 mole), anhydrous potassium carbonate (0.76 g, 0.0055 mole) and dimethylformamide (20 ml) was stirred and heated at 100° C. for 2 hours. The mixture was cooled and then poured into water (200 ml) to give a white precipitate which was collected by filtration. Recrystallization from ethanol gave the product, ethyl 2-[2-fluoro-4-(6-chloroquinoxalin-2-yloxy)phenoxy]propionate, as colourless crystals (1.3 g; 66%), mp 110° C. Proton magnetic resonance spectrum (CDCl3, δ in ppm); 1.3, t, 3H (CH2CH3); 1.7, d, 3H (CHCH3); 4.3, q, 2H (OCH2CH3); 4.8, q, 1H (CHCH3); 6.9-7.5, m, 3H (phenoxy ring); 7.8, bs, 2H (C7, C8 of quinoxaline); 8.2, bs, 1H (C5 of quinoxaline); 8.8, s, 1H (C3 of quinoxaline).

1. temperatureThe mixture was cooled
2. customto give a white precipitate which
3. filtrationwas collected by filtration
4. customRecrystallization from ethanol