反应详情

温度

65 °C

332 g (1.16 mol) of diethyl 2-(2,4,6-trifluorophenyl)malonate and 192 g (1.04 mol) of tributylamine were heated at 180° C. for eight hours together with 182 g (1.17 mol) of pyridine-2-carboxamidine. In the course of this, the ethanol produced was distilled off. The reaction mixture was then allowed to cool to 60-70° C. and was mixed with a solution of 116 g (2.89 mol) of sodium hydroxide in 1200 ml of water. After stirring for 30 min and cooling to approximately 20-25° C., the mixture was extracted with methyl tert-butyl ether (MTBE) and, after phase separation, the aqueous phase was acidified with 6N hydrochloric acid. After filtering off and drying, 180 g of the title compound were obtained.

1. distillationwas distilled off
2. temperaturecooling to approximately 20-25° C.
3. extractionthe mixture was extracted with methyl tert-butyl ether (MTBE)
4. customafter phase separation
5. filtrationAfter filtering off
6. customdrying