16-Unsaturated corticoids are readily transformed to correspoding 16α-methyl-17α-hydroxycorticoids, respectively via novel silyl derivatives which are Δ17(20)-steroids, 17α, 20-epoxide steroids and 17α-sityl ether steroids.
The first step in the overall process involves the use of a methylating agent, in the presence of a copper catalyst, and then a silylating agent. The last step in the overall process can be carried out under mild conditions, using a peracid.
16- 不饱和皮质类
固醇很容易通过新型
硅烷衍
生物分别转化为相应的 16α-甲基-17α-羟基皮质类
固醇,这些新型
硅烷衍
生物是 Δ17(20)- 类
固醇、17α,20-环氧类
固醇和 17α - 叔位
醚类固醇。 整个过程的第一步涉及在
铜催化剂存在下使用甲基化剂,然后使用
硅烷化剂。 整个过程的最后一步可在温和条件下使用过酸进行。