反应详情

温度

-30 °C

To a solution of the 4-(2,4-dichloro-phenoxy)-butyric acid (9.8 g, 40 mmol) and triethylamine (6.0 ml, 40 mmol) in dichloromethane (150 mL) was added dropwise isobutyl chlorocarbonate (6 mL, 40 mol) at −30° C. After stirring at −30° C. for 3 h, aniline (4 mL 40 mol) was added dropwise. The reaction mixture was stirred for 3 h at −30° C. and then allowed to warm up to RT. Aqueous HCl (5%, 100 mL) was added and stirring was continued for 0.5 h. The phases were separated, the aqueous layer was extracted with dichloromethane (2×200 mL). The combined organic extracts were washed with water and brine, dried over Na2SO4 and concentrated in vacuo to give the product (10 g, 77.5%). 1H-NMR (CDCl3): δ 7.49 (d, 2H, J=8.0 Hz), 7.38 (d, 1H, J=2.4 Hz), 7.31 (t, 2H, J=8.0 Hz), 7.18 (dd, 1H, J1=8.8 Hz, J2=2.4 Hz) 7.12 (t, 1H, J=8.0), 6.87 (d, 1H, J=8.8 Hz), 4.12 (t, 2H, J=6.4 Hz), 2.64 (t, 2H, J=6.4 Hz), 2.25 (p, 2H, J=6.4 Hz).

1. stirringThe reaction mixture was stirred for 3 h at −30° C.
2. temperatureto warm up to RT
3. stirringstirring
4. waitwas continued for 0.5 h
5. customThe phases were separated
6. extractionthe aqueous layer was extracted with dichloromethane (2×200 mL)
7. washThe combined organic extracts were washed with water and brine
8. dry with materialdried over Na2SO4
9. concentrationconcentrated in vacuo