反应详情

温度

120 °C

1-Bromo-2-difluoromethoxy-4-nitro-benzene (Step A, 2.0 g, 7.5 mmol, 1.0 eq.) and N-(2-propyl)piperazine (0.85 mL, 9.7 mmol, 1.3 eq.) were dissolved in 20 mL of DMSO. K2CO3 (1.5 g, 11.2 mmol, 1.5 eq.) and Bu4N+Br− (240 mg, 0.75 mmol, 0.1 eq.) were added and the mixture was heated to 120° C. The mixture was stirred for 3 h and cooled to RT, poured into H2O (200 mL) and 6 N HCl (20 mL). The aqueous solution was washed with EtOAc, and alkalinized with 6 N NaOH then extracted with EtOAc. The combined organic layers were dried (MgSO4), filtered and concentrated. The crude material was further purified by column chromatography (0-100% EtOAc in hexanes) providing pure 1-(2-difluoromethoxy-4-nitro-phenyl)-4-isopropyl-piperazine.

1. temperaturecooled to RT
2. washThe aqueous solution was washed with EtOAc
3. extractionthen extracted with EtOAc
4. dry with materialThe combined organic layers were dried (MgSO4)
5. filtrationfiltered
6. concentrationconcentrated
7. customThe crude material was further purified by column chromatography (0-100% EtOAc in hexanes)