enol ether 4a and the 1,3 dione 4b is expected to proceed with high regio and stereoselectivity. The bicyclo [5.2.1] dodecane derivative 3 , an important structural element of simple model taxane diterpenes, was prepared in high yield by the photocycloaddition of enones 4a and 4b to vinyl acetate followed by opening of the thus formed cyclobutane ring, via the de Mayo reaction.
摘要
乙酸乙烯酯与其 p 系统上带有氧化官能团的烯酮的光环加成反应,如 1,3 二酮烯醇醚 4a 和 1,3 二酮 4b 有望以高区域和立体选择性进行。双环 [5.2.1]
十二烷衍
生物 3 是简单模型
紫杉烷二萜的重要结构元素,通过将烯酮 4a 和 4b 光环加成到
乙酸乙烯酯,然后打开由此形成的
环丁烷环,通过去梅奥反应。