反应详情

To a stirred solution of 2-(4-Phenyl-piperazin-1-yl)-ethylamine 4a (0.5 g, 2.44 mmol) and Et3N (0.34 g, 3.41 mmol) in 40 mL of dry CH2Cl2 under nitrogen at 0° C. was added a solution (4-Nitro-phenyl)-acetyl chloride (0.58 g, 2.92 mmol). The temperature was allowed to rise to room temperature, the mixture was stirred for 2 h, and then washed with water. The aqueous layer was extracted with dichloromethane. The combined organic phase was washed with saturated sodium chloride, dried (Na2SO4) and concentrated. The crude product was purified by column chromatography over silica gel (EtOAc) to produce 26a: 0.8 g, (89% yield) as a white solid (mp: 138-139° C.). 1H NMR (CDCl3, 400 MHz): δ 2.52 (2H, t, J=5.6, CH2—CH2NH), 2.57 (4H, t, J=5.2, (CH2)2N—), 3.11 (4H, t, J=5.2, (CH2)2—NPh), 3.36-3.34 (2H, m, CH2—NHCO), 3.65 (2H, s, CH2Ar), 6.19 (1H, bs, NHCO), 6.86-6.91 (3H, m, ArH), 7.25-7.29 (2H, m, ArH), 7.47 (2H, d, J=8.8, ArH), 8.16-8.19 (2H, m, ArH).

1. customto rise to room temperature
2. washwashed with water
3. extractionThe aqueous layer was extracted with dichloromethane
4. washThe combined organic phase was washed with saturated sodium chloride
5. dry with materialdried (Na2SO4)
6. concentrationconcentrated
7. customThe crude product was purified by column chromatography over silica gel (EtOAc)