反应详情

A mixture of 3-chloro-5-trifluoromethyl-2-(4-nitrophenoxy)pyridine (1.0 g), iron powder (3.2 g), isopropyl alcohol (60 ml), water (6 ml) and dilute hydrochloric acid (0.2 ml of a 2N solution), were heated at the reflux temperature for 12 hours. After cooling and filtering to remove the solid matter, the filtrate was concentrated by evaporation of the volatile portion under reduced pressure. The residual solid was recrystallised from n-hexane to yield 2-(4-aminophenoxy)-3-chloro-5-trifluoromethylpyridine (0.73 g) m.p. 85°-87° C.

1. temperaturewere heated at the reflux temperature for 12 hours
2. temperatureAfter cooling
3. filtrationfiltering
4. customto remove the solid matter
5. concentrationthe filtrate was concentrated by evaporation of the volatile portion under reduced pressure
6. customThe residual solid was recrystallised from n-hexane