反应详情

温度

0 °C

25.4 g of copper(II) bromide and 4.9 g of lithium bromide in 95 ml of anhydrous acetonitrile are added to 22.1 g of 7α-(5-chloropentyl)-11β-fluoro-estr-4-ene-3,17-dione in 160 ml of anhydrous acetonitrile at 80° C. After 20 minutes, the reaction mixture is cooled to 0° C., and 200 ml of saturated sodium bicarbonate solution is added in drops. Then, the solution is stirred into 750 ml of water, brought to pH=6 with 2N hydrochloric acid, extracted 3 times with ethyl acetate, washed with common salt solution, dried on magnesium sulfate and concentrated by evaporation in a vacuum. Chromatography of the crude product on silica gel with a hexane-ethyl acetate gradient yields 14.7 g of 7α-(5-chloropentyl)-11β-fluoro-3-hydroxy-estra-1,3,5(10)-trien-17-one.

1. extractionextracted 3 times with ethyl acetate
2. washwashed with common salt solution
3. customdried on magnesium sulfate
4. concentrationconcentrated by evaporation in a vacuum