反应详情

温度

40 °C

Using the procedure set forth in U.S. Pat. No. 3,598,859, the disclosure of which is incorporated herein by reference in its entirety. N-(3,4-dichlorophenyl)alanine was prepared. Specifically, to a solution of 3,4-dichloroaniline (1 equivalent) (Aldrich) in isopropanol (about 500 mL per mole of 3,4-dichloroaniline) is added water (about 0.06 mL per mL of isopropanol) and 2-chloropropionic acid (2 equivalents) (Aldrich). This mixture is warmed to 40° C. and sodium bicarbonate (0.25 equivalents) is added in successive portions before heating under reflux for 4-5 days. After cooling, the reaction mixture is poured into water and the unreacted 3,4-dichloroaniline is removed by filtration. The filtrate is acidified to pH 3-4 with concentrated hydrochloric acid and the resultant precipitate is filtered, washed and dried to yield the title compound, m.p.=148-149° C.

1. customN-(3,4-dichlorophenyl)alanine was prepared
2. temperaturebefore heating
3. temperatureunder reflux for 4-5 days
4. temperatureAfter cooling
5. customthe unreacted 3,4-dichloroaniline is removed by filtration
6. filtrationthe resultant precipitate is filtered
7. washwashed
8. customdried