反应详情

Step C A suspension of (3-methoxy-4-nitro-phenyl)-acetic acid tert-butyl ester (3 g, 11.2 mmol) in methanol (100 mL) was added an aqueous solution (50 mL) of NH4Cl (6 g, 112 mmol), followed by activated zinc (Aldrich, 7.3 g, 112 mmol). The reaction mixture was stirred at room temperature for 0.5 h. The mixture was filtered through a short pad of celite. The mixture was concentrated. The residue was partitioned between ethyl acetate and water. The organic layer was separated, and aqueous layer was extracted with ethyl acetate. The combined organic extract was washed with water, brine, dried over MgSO4, and concentrated to give (4-amino-3-methoxy-phenyl)-acetic acid tert-butyl ester as a brown oil (2.5 g, 94%).

1. filtrationThe mixture was filtered through a short pad of celite
2. concentrationThe mixture was concentrated
3. customThe residue was partitioned between ethyl acetate and water
4. customThe organic layer was separated
5. extractionaqueous layer was extracted with ethyl acetate
6. extractionThe combined organic extract
7. washwas washed with water, brine
8. dry with materialdried over MgSO4
9. concentrationconcentrated