反应详情

Under ice cooling, a suspension of 5.18 g of 3-acetoxy-1α-methylandrosta-2,4-dien-17-one in 50 ml of dioxane and 100 ml of water is combined in portions with 2.2 g of 1,3-dibromo-5,5-dimethylhydantoin and stirred for one hour at room temperature. Subsequently, the mixture is precipitated into 1 liter of water saturated with sodium chloride, 2.7 g of sodium sulfite is added, and the mixture is stirred for 60 minutes. The precipitated residue is filtered off, washed free of chloride with water, and dried, thus obtaining 5.65 g of a mixture of 2β-bromo-1α-methyl-4-androstene-3,17-dione and 2β-bromo-1α-methyl-4-androstene-3,17-dione.

1. customSubsequently, the mixture is precipitated into 1 liter of water saturated with sodium chloride, 2.7 g of sodium sulfite
2. additionis added
3. stirringthe mixture is stirred for 60 minutes
4. filtrationThe precipitated residue is filtered off
5. washwashed free of chloride with water
6. customdried