反应详情

温度

-5 °C

Thionyl chloride (71 mg, 0.60 mmol) was added slowly to a solution of 4-[4-(2,2,2-Trifluoroacetylamino)phenyl]butanoic acid (Formula 45) (0.15 g, 0.55 mmol) in DMF (5 mL) cooled at −5° C. The mixture was stirred for an additional 1 hour at −5° C. Excess dimethylamine (freshly distilled from its 40% aqueous solution) was added to the reaction medium. The second mixture was stirred for an additional 1 hour. Ethyl acetate (50 mL) was added to the mixture, which was washed with brine (2×50 ml). The organic layer was dried over MgSO4, and concentrated to yield N,N-Dimethyl 4-[4-(2,2,2-Trifluoroacetylamino)phenyl]butanamide (Formula 46) (0.17 g, quant.) as a yellowish solid. 1H NMR 9.70 (br s, 1H), 7.55 (d, 2H, J=8.6 Hz), 7.11 (d, 2H, J=8.6 Hz), 2.91 (s, 3H), 2.89 (s, 3H), 2.60 (t, 2H, J=7.7 Hz), 2.27 (t, 2H, J=7.7 Hz), 1.89 (p, 2H, J=7.7 Hz).

1. distillationExcess dimethylamine (freshly distilled from its 40% aqueous solution)
2. additionwas added to the reaction medium
3. stirringThe second mixture was stirred for an additional 1 hour
4. additionEthyl acetate (50 mL) was added to the mixture, which
5. washwas washed with brine (2×50 ml)
6. dry with materialThe organic layer was dried over MgSO4
7. concentrationconcentrated