反应详情

温度

0 °C

To a solution of 2-(dibenzylamino)-3-(difluoromethoxy)propanoic acid (280 mg, 0.835 mmol) and triethylamine (338 mg, 3.34 mmol) in THF (5 mL) at −5° C., isobutyl chloroformate (119.8 mg, 0.876 mmol) was added dropwise. After 20 minutes, 3,4-difluorobenzylamine (131.3 mg, 0.919 mmol) was added and the reaction mixture allowed to warm up to 0° C. for another hour. The mixture was then diluted with ethyl acetate and washed with water, 0.5 N HCl and Brine. The organic layer was dried over magnesium sulphate, concentrated with silica gel and purified by column chromatography, eluting with 10˜20% ethyl acetate in hexanes, to give 2-dibenzylamino-N-(3,4-difluoro-benzyl)-3-difluoromethoxy-propionamide (298 mg, 77.5%) as a colorless oil. 1H NMR (300 MHz, CDCl3): δ(ppm) 7.56 (t, 1H), 6.82-7.38 (m, 13H), 6.60 (wt, 1H), 4.58 (dd, 1H), 4.37 (m, 3H), 3.90 (d, 2H), 3.73 (d, 2H) and 3.70 (m, 1H).

1. washwashed with water, 0.5 N HCl and Brine
2. dry with materialThe organic layer was dried over magnesium sulphate
3. concentrationconcentrated with silica gel
4. custompurified by column chromatography
5. washeluting with 10˜20% ethyl acetate in hexanes