Water → HCID 15513552, compound

Participants

Reaction Steps

43.55 g of 11β-fluoro-4-estren-17-ol-3-one (150 mmol, Tetrahedron Letters 1995, 2611) is suspended in 1500 ml of acetonitrile, 50 g of copper(II) bromide is added, and it is stirred at room temperature. After 16 hours, additional copper(II) bromide is added in three portions (25 g, 12 g, 6 g) within 6 hours, and finally stirred for another 6 hours at room temperature. The reaction mixture is cooled in an ice bath, mixed with 500 ml of water and extracted with ethyl acetate. The organic phase is mixed with a little methanol, washed with saturated bicarbonate solution and common salt solution and dried with sodium sulfate. After concentration by evaporation, the substance crystallizes out, yield 30.8 g (71% of theory), flash point 233-234° C.

Provenance & Evidence