反应详情

At room temperature, 4.6 ml of ethyl formate is added to 4.6 g of 17β-hydroxy-17α-methylandrosta-4,15-dien-3-one in 40 ml of tetrahydrofuran and 70 ml of toluene. Then 3.5 g of sodium hydride (60% paraffin suspension) is added in small portions. After 6 hours, the reaction mixture is gently stirred into ice/water which contains hydrochloric acid, the precipitated product is suctioned off, washed with water, dissolved in methylene chloride, dried, and concentrated under vacuum. After chromatography of the crude product on silica gel with a hexane-ethyl acetate gradient, 2.4 g of (Z)-17β-hydroxy-2-hydroxymethylene-17α-methylandrosta-4,15-dien-3-one is obtained, mp 176° C. (from acetone/hexane).

1. washwashed with water
2. dissolutiondissolved in methylene chloride
3. customdried
4. concentrationconcentrated under vacuum