反应详情

A mixture of 1-fluoro-2-isocyanato-4-nitrobenzene (1.125 g, 6.18 mmol) and pyrrolidine (485 mg, 6.8 mmol) in DCM (20 mL) was stirred at rt for 14 hrs. After concentrated, the mixture was extracted with ethyl acetate. The organic layer was washed with aqueous citric acid solution and dried over MgSO4, followed by hydrogenation with Pd/C (wet, 10%, 0.15 g) under a hydrogen balloon overnight. After filtration and concentration, the reasonable pure N-(5-amino-2-fluorophenyl)pyrrolidine-1-carboxamide (28.5, 1.44 g) was used for the next reactions. MS+: 224.2, UV: λ=271.6 nm. 1H NMR: (DMSO) δ7.44 (s, 1H), δ6.78 (m, 1H), δ6.20 (m, 1H), δ3.32 (m, 4H), δ1.83 (m, 4H).

1. concentrationAfter concentrated
2. extractionthe mixture was extracted with ethyl acetate
3. washThe organic layer was washed with aqueous citric acid solution
4. dry with materialdried over MgSO4
5. customballoon overnight
6. filtrationAfter filtration and concentration