【摘 要】
：
Regioselective decomposition of 11-substituted-16α,17α-methyleneazopregna-1,4-dien-3, 20-dione I proceeded smoothly through thermal decomposition in the prese
【机 构】
：
The West China School of Pharmacy
论文部分内容阅读
Regioselective decomposition of 11-substituted-16α,17α-methyleneazopregna-1,4-dien-3, 20-dione I proceeded smoothly through thermal decomposition in the presence of BF3.Et2O or HC1O4 with high yields. I was converted to 11-substituted-16-methylpregna-1, 4, 16(17)-trien-3,20-dione II by the thermal decomposition, while with HClO4 as a catalyst, 11-substituted-16α,was used as catalyst, a mixture of Ⅱ and Ⅲ (1: 3) was obtained.
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