反应详情

To a solution of 140 (34 g, 0.144 mol) and EtOH (510 mL) was added SnCl2.2H2O (130.1 g, 0.576 mol) and the resulting mixture was heated to reflux for 4 h. After the completion of the reaction, the solvent was removed in vacuo. The residue was taken up in water and made slightly basic with 10% NaHCO3. The resulting solid was filtered and washed well with EtOAc. The aqueous layer was separated and extracted with EtOAc. The combined organic layers were dried (Na2SO4), filtered and concentrated in vacuo to afford 25 g (84%) of 4-bromo-3-fluoro-benzene-1,2-diamine (142) as yellow solid which was used without further purification.

1. temperaturethe resulting mixture was heated
2. temperatureto reflux for 4 h
3. customAfter the completion of the reaction
4. customthe solvent was removed in vacuo
5. filtrationThe resulting solid was filtered
6. washwashed well with EtOAc
7. customThe aqueous layer was separated
8. extractionextracted with EtOAc
9. dry with materialThe combined organic layers were dried (Na2SO4)
10. filtrationfiltered
11. concentrationconcentrated in vacuo