Hydrochloric Acid → HCID 12796455, compound

Participants

Reaction Steps

A solution of 20-oximino-5α-pregna-2,16-diene-11-one (60 g) in anhydrous pyridine (250 ml) was treated with 225 ml of a solution prepared from phosphorus oxychloride (55 ml) in anhydrous pyridine (250 ml) whilst maintaining the reaction temperature at `5° during addition of the reagent. The reaction mixture was then added to a solution of concentrated HCl (350 ml) in water (3 l). This mixture was stirred for 60 hours before collecting the precipitate by filtration. The precipitate was washed with water, dissolved in hot industrial methylated spirits and treated with 2 N HCl (50 ml) at room temperature. After one hour, the reaction mixture was diluted with water and the precipitate obtained was collected by filtration, washed with water and dried. (38.4 g). Crystallisation from methanol afforded the title compound, m.p. 188°-192°, [α]D +207°.

Provenance & Evidence