反应详情

温度

220 °C

Diethyl 2-[(4-methoxy-3-methyl-phenylamino)-methylene]-malonate (73.9 g) was dissolved in diphenyl ether (200 ml) to prepare a solution which was then stirred at 220° C. for 2 hr. The reaction solution was cooled to room temperature, hexane was then added to the reaction solution, and the precipitated crystal was collected by filtration to give ethyl 6-methoxy-7-methyl-4-oxo-1,4-dihydro-quinoline-3-carboxylate (25.5 g, yield 35%).

1. customto prepare a solution which
2. temperatureThe reaction solution was cooled to room temperature
3. filtrationthe precipitated crystal was collected by filtration