Reacción #9575

Ecuación de reacción

hydrochloric acid

Diethyl malonate

2-bromoaniline

sodium carbonate

→

N-(2-bromophenyl)malonamic acid

Rendimiento 57.3%

Disolventes

methanol

water

Condiciones de reacción

Tratamiento posterior

1. 1
   Otroto collect the volatiles
2. 2
   Temperaturato cool to ambient temperature overnight
3. 3
   Otroa precipitate formed
4. 4
   OtroThe precipitate was isolated by filtration
5. 5
   TemperaturaThe mixture was heated
6. 6
   Temperaturaat reflux for two hours
7. 7
   Temperaturato cool to ambient temperature
8. 8
   Temperaturacooled to 0° C
9. 9
   Otroa white precipitate formed
10. 10
    OtroThe precipitate was isolated by filtration
11. 11
    Lavadowashed with water
12. 12
    Otrodried overnight on the filter funnel

Procedimiento

Diethyl malonate (101 mL, 0.989 mol) and 2-bromoaniline (50.g, 0.291 mol) were combined and heated at 180° C. for six hours. A Dean-Stark trap was used to collect the volatiles. The reaction was allowed to cool to ambient temperature overnight; a precipitate formed. The precipitate was isolated by filtration and combined with methanol (160 mL), water (800 mL), and solid sodium carbonate (105 g). The mixture was heated at reflux for two hours, allowed to cool to ambient temperature, and then cooled to 0° C. The mixture was adjusted to pH 2 with the addition of 3 N hydrochloric acid; a white precipitate formed. The precipitate was isolated by filtration, washed with water, and dried overnight on the filter funnel to provide 43 g of N-(2-bromophenyl)malonamic acid as a white solid.

Fuente