Sodium borohydride → 11beta-Fluoro-7alpha-{5-(methyl-nonyl-amino]pentyl}-oestra-1,3,5(10)-triene-3,17beta-diol

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85 mg of 11β-fluoro-3-hydroxy-7α-{5-[methyl-nonyl-amino]-pentyl}-estra-1,3,5(10)-trien-17-one is dissolved in 3 ml of methanol and mixed with 25 mg of sodium borohydride. After 30 minutes of stirring at room temperature, the solvent is drawn off in a vacuum for the most part, the residue is mixed with common salt solution, extracted 3 times with methylene chloride, dried on magnesium sulfate and concentrated by evaporation in a vacuum. Preparative thin-layer chromatography with methylene chloride/methanol=9/1+0.5% triethylamine as a mobile solvent provides 33 mg of 11β-fluoro-7α-{5-[methyl-nonyl-amino]-pentyl}-estra-1,3,5(10)-triene-3,17β-diol as a foam.

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