反应详情

A solution of 2-bromoaniline (2.5 g, 14.62 mmol) and ethyl ethoxymethylenemalonate (3.16 g, 14.62 mmol) was heated at 100° C. for 3 h. Then the volatiles were removed by passing a stream of nitrogen and the molten mass was added slowly onto boiling diphenyl ether (10 mL) and the mixture was heated at reflux for 2 h. Then petroleum ether was added to the reaction mixture at rt and the precipitated solid was collected by filtration and dried to afford 3.5 g of the title product. 1H NMR (300 MHz, DMSO d6): δ 11.65 (br s, 1H), 8.45 (s, 1H), 8.17 (d, J=7.8 Hz, 1H), 8.05 (d, J=7.8 Hz, 1H), 7.39-7.34 (t, J=7.8 Hz, 1H), 4.26-4.19 (q, J=7.2, 14.1 Hz, 2H), 1.30-1.26 (t, J=6.9 Hz, 3H).

1. customThen the volatiles were removed
2. additionthe molten mass was added slowly
3. temperaturethe mixture was heated
4. temperatureat reflux for 2 h
5. additionThen petroleum ether was added to the reaction mixture at rt
6. filtrationthe precipitated solid was collected by filtration
7. customdried