反应详情

温度

0 °C

At 0° C., 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (28.1 g, 0.15 mol) was added to a solution of 1-hydroxybenzotriazole (19.8 g, 0.15 mol) and 2-chlorophenylacetic acid (Aldrich 19,063-2, 25.0 g, 0.15 mol) in N,N-dimethylformamide (150 ml) and DCM (50 ml). The reaction mixture was stirred for 20 min at 0° C. A 33% solution of methylamine in ethanol (365 ml, 2.9 mol) was added. The reaction mixture was stirred for 56 hours at room temperature. It was diluted with ethyl acetate (300 ml) and washed with a 10% aqueous solution of sodium hydrogensulphate (400 ml). The aqueous phase was extracted with ethyl acetate (2×150 ml). The combined organic layers were washed with a saturated solution of sodium hydrogencarbonate (400 ml) and dried over magnesium sulphate. The solvent was removed in vacuo. The crude product was purified by flash chromatography on silica (300 g), using ethyl acetate/heptane 2:1 as eluent, to give 21.6 g of 2-(2-chlorophenyl)-N-methylacetamide.

1. stirringThe reaction mixture was stirred for 56 hours at room temperature
2. washwashed with a 10% aqueous solution of sodium hydrogensulphate (400 ml)
3. extractionThe aqueous phase was extracted with ethyl acetate (2×150 ml)
4. washThe combined organic layers were washed with a saturated solution of sodium hydrogencarbonate (400 ml)
5. dry with materialdried over magnesium sulphate
6. customThe solvent was removed in vacuo
7. customThe crude product was purified by flash chromatography on silica (300 g)