反应详情

The above 6,7-difluoro-3-styryl-1H-quinoxalin-2-one (2.65 g, 0.93 mmol) was mixed with 4-dimethylaminopyridine (0.27 g) and POCl3 (27 ml) and the mixture was refluxed for 30 minutes. After cooling, the mixture was poured onto ice (400 ml) and the solid was filtered, washed with water (3×) and dried in vacuo overnight. Column chromatography on silica gel, eluting with ethyl acetate:heptane 1:20 afforded 1.6 g (56%) of the title compound.

1. temperaturethe mixture was refluxed for 30 minutes
2. temperatureAfter cooling
3. additionthe mixture was poured onto ice (400 ml)
4. filtrationthe solid was filtered
5. washwashed with water (3×)
6. customdried in vacuo overnight
7. washColumn chromatography on silica gel, eluting with ethyl acetate:heptane 1:20