Dimethylformamide → HCID 67362260, compound

Participants

Reaction Steps

At 0° C., 77.5 ml of methanesulfonyl chloride is added dropwise within 10 minutes to 250 g of 15α-hydroxy-18-methyl-4-estrene-3,17-dione in 704 ml of pyridine. After 3.5 hours, 350 ml of dimethylformamide and 283 g of anhydrous sodium acetate are added, the mixture is stirred under argon for 20 hours at room temperature, and the reaction mixture is introduced into ice water. The thus-precipitated product is suctioned off, washed with water, and dried under vacuum. For purposes of purification, the crude product (212 g) is treated with 21 g of active carbon in 1,500 ml of ethyl acetate and 0.4 ml of pyridine. After concentrating the solution to 420 ml, 188 g of 18-methyl-4,15-estradiene-3,17-dione is crystallized at 0° C. Melting point 156.9° C. (from acetone/hexane).

Provenance & Evidence