反应详情

温度

50 °C

In 5 ml of tetrahydrofuran was dissolved 100 mg of 20-(1,3-dioxolan-2-yl)-3β-acetoxy-1α-benzoyloxypregna-5,7-diene, followed by addition of 1 ml of water and 10 mg of p-toluenesulfonic acid. The mixture was stirred in an atmosphere of argon gas at 50° C. for 3 hours. The reaction mixture was then worked up in the same manner as Example 156 to give 45 mg of 3β-acetoxy-1α-benzoyloxypregna-5,7-diene-20-carbaldehyde showing the following physical properties.