Water → 7alpha-(5-Acetoxypentyl)-11beta-fluorooestr-4-ene-3,17-dione

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Reaction Steps

20 g of 11β-fluoro-7α-(5-hydroxypentyl)-estr-4-ene-3,17-dione in 100 ml of pyridine can be reacted over a period of 2 hours with 50 ml of acetic anhydride at 25° C. Then, 5 ml of water is added at 0° C., and it is stirred for 45 minutes. It is extracted with diethyl ether, washed with 2N sulfric acid, pyridine-free, and the solution is neutralized in succession with saturated sodium bicarbonate solution and water. After drying and concentration by evaporation in a vacuum, the crude product is chromatographed on silica gel with a hexane-ethyl acetate-gradient. 17 g of 7α-(5-acetoxypentyl)-11β-fluoro-estr-4-ene-3,17-dione with a melting point of 78.4° C. is obtained.

Provenance & Evidence