反应详情

温度

50 °C

5-Fluoro-2-nitrotoluene (1 mL, 8.20 mmol, commercially available from Aldrich), Boc-piperazine (1.68 g, 9.02 mmol, commercially available from Aldrich), anhydrous potassium carbonate (2.27 g, 16.40 mmol) and DMF (25 mL) were combined and heated to 50° C. for 24 hours. Upon allowing the reaction mixture to cool to room temperature, water was added to the reaction mixture and the resulting precipitate was filtered as product, washed with ether and dried under reduced pressure to give 2.21 g tert-butyl 4-(3-methyl-4-nitrophenyl)piperazine-1-carboxylate. 1H-NMR (400 MHz, CDCl3), δ 7.96 (d, 1H), 6.90 (s, 1H), 6.85 (s, 1H), 3.35 (m, 4H), 3.19 (m, 4H), 2.55 (s, 3H), 1.42 (s, 9H). MS (EI): 322 (MH+).

1. temperatureto cool to room temperature
2. filtrationthe resulting precipitate was filtered as product
3. washwashed with ether
4. customdried under reduced pressure