反应详情

While cooling with ice, 17.2 g (0.05 mole) of α-[4-(p-trifluoromethylphenoxy)-phenoxy]-propionyl chloride are added dropwise to a mixture of 4.1 g (0.055 mole) of 2-methoxyethylamine, 7.5 ml (0.055 mole) of triethylamine and 50 ml of methylene chloride, and the temperature is allowed to rise to 20° C. The reaction mixture is stirred for 2 hours, then concentrated. The residue is filtered in ether over a small column of silica gel. Concentration of the filtrate affords 14.9 g (77.6%) of α-[4-(p-trifluoromethylphenoxy)-phenoxy]-propionic acid (2-methoxy)-ethylamide with a melting point of 73°-75° C.

1. customto rise to 20° C
2. concentrationconcentrated
3. filtrationThe residue is filtered in ether over a small column of silica gel