反应详情

0.015 g of sodium hydride is added to a solution of 0.175 g of 5,5-dimethyl-3-(4-trifluoromethoxyphenyl)imidazolidine-2,4-dione in 2 ml of anhydrous dimethylformamide, under an inert atmosphere of argon at a temperature in the region of 20° C. Stirring is maintained at this temperature for 30 minutes. A solution of 0.185 g of 2-ethoxy-4-(bromomethyl)pyridine in 2 ml of anhydrous dimethylformamide is added, followed by addition of ice-cold water after reaction for 10 minutes. The reaction mixture is placed on a cartridge 37 mm in diameter packed with 65 g of octadecyl-grafted 40-60 μm silica conditioned successively with the mixture (water/acetonitrile) (5/95) (v/v) and then with the mixture (water/acetonitrile) (95/5) (v/v). The elution is performed with a mixture (water/acetonitrile) (95/5) (v/v) over 20 minutes, followed by a linear gradient of from 5% to 95% acetonitrile over 60 minutes, at a flow rate of 10 ml/minute. The fractions between 700 and 760 ml are concentrated under reduced pressure. 0.145 g of 5,5-dimethyl-1-(2-ethoxypyrid-4-ylmethyl)-3-(4-trifluoromethoxyphenyl)imidazolidine-2,4-dione is thus obtained, the characteristics of which product are as follows:

1. temperatureis maintained at this temperature for 30 minutes
2. additionfollowed by addition of ice-cold water
3. customafter reaction for 10 minutes
4. washThe elution
5. waitfollowed by a linear gradient of from 5% to 95% acetonitrile over 60 minutes, at a flow rate of 10 ml/minute
6. concentrationThe fractions between 700 and 760 ml are concentrated under reduced pressure