Sulfuric Acid → HCID 9943709, compound

Participants

Reaction Steps

To 15 ml of concentrated sulfuric acid (98%) cooled to ˜5° C. was added dropwise ˜20 Mm of a mixture containing 10-hydroxy-7α-methyl-estra-4-ene-3,17-dione (III) and 5,10-dihydroxy-7α-methyl-estra-3,17-dione (IV) from example 2 dissolved in 15 ml of methylene chloride. About 20 minutes after the addition was complete, TLC ({fraction (1/1)} ethyl acetate/hexane, Rf 0.4) showed that the reaction was complete. The deep red reaction mixture was poured over ice, washed in with methylene chloride, partially neutralized with potassium carbonate, and the phases separated. The organic phase was washed with dilute aqueous potassium carbonate, brine, and dried over sodium sulfate, and concentrated under vacuum to a solid product. This material was column chromatographed on 150 g of silica gel with gradient elution from ⅓ to {fraction (1/1)} ethyl acetate/hexane. Fractions 6-9 were combined to give a solid which was recrystallized from ethyl acetate to provide the title product. Mp 208-209° C.

Provenance & Evidence