反应详情

温度

75 °C

A stirred solution of 2-bromo-4-fluoro-5-nitrobenzotrifluoride (1.15 g, 4.0 mmol) in dimethylformamide (15 ml) at room temperature under argon was treated with diisopropylethylamine (1.8 ml, 10 mmol) and 1,1-dimethylethyl 4-amino-1-piperidinecarboxylate (0.90 g, 4.5 mmol), then heated at 75° C. for 3 hrs. The solution was concentrated under vacuum and the residue treated with 10% Na2CO3 solution (30 ml) and extracted with ethyl acetate (2×40 ml). The combined extract was washed with brine (40 ml), then dried (Na2SO4) and concentrated under vacuum to leave an orange solid which was purified by chromatography on silica gel (20 g) eluting with dichloromethane to afford the title compound as a yellow solid (1.08 g, 58%).

1. concentrationThe solution was concentrated under vacuum
2. additionthe residue treated with 10% Na2CO3 solution (30 ml)
3. extractionextracted with ethyl acetate (2×40 ml)
4. extractionThe combined extract
5. washwas washed with brine (40 ml)
6. dry with materialdried (Na2SO4)
7. concentrationconcentrated under vacuum
8. customto leave an orange solid which
9. customwas purified by chromatography on silica gel (20 g)
10. washeluting with dichloromethane