反应详情

To a mixture of 4-chloro-2-fluoronitrobenzene (175 mg, 1.00 mmol) and K2CO3 (139 mg, 1.00 mmol) in toluene (2 mL), morpholine (87 μL, 1.0 mmol) was added at 0° C. The resulting mixture was allowed to warm to RT and stirred overnight. The reaction mixture was concentrated and the product was isolated by flash chromatography on silica (20% EtOAc/hexane) to obtain 4-(5-Chloro-2-nitro-phenyl)-morpholine (205 mg, 67%). This compound (243 mg, 1.00 mmol) was dissolved in 1-methylpiperazine (1 mL) and the resulting mixture was heated at 130° C. overnight. The reaction mixture was diluted with water and the product was extracted with DCM (3×10 mL). The DCM layers were combined, dried (Na2SO4) and concentrated to obtain the title compound (177 mg, 58%). 1H-NMR (CDCl3; 400 MHz): δ 8.04 (d, 1H, J=9.4 Hz), 6.46 (dd, 1H, J=9.4, 2.6 Hz), 6.31 (d, 1H, =2.6 Hz), 3.89 (m, 4H), 3.40 (m, 4H), 3.07 (m, 4H), 2.50 (m, 4H), 2.36 (s, 3H).

1. additionwas added at 0° C
2. concentrationThe reaction mixture was concentrated
3. customthe product was isolated by flash chromatography on silica (20% EtOAc/hexane)