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Citation:
Bing YANG, Jun YANG, Ling Ling WENG, Hu ZHENG. Regioselective Decomposition of 11-Substituted-16α, 17α-methyleneazopregna-1, 4-dien-3, 20-dione[J]. Chinese Chemical Letters,
;2006, 17(1): 12-14.
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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 HC1O4with 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, 17α-methylenepregna-1, 4-dien-3, 20-dione Ⅲ was the main product.However, when BF3·Et20 was used as catalyst, a mixture of Ⅱ and Ⅲ (1:3) was obtained.
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Keywords:
- Methyleneazopregnanes,
- methylenepregnanes,
- regioselective,
- decom,
- position
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