Application of palladium-catalyzed cycloalkenylation reaction to terpenoid synthesis—novel approach to tricyclo[5.3.1.02,6]undecane derivative and its transformation into bicyclo[5.3.1]undecane ring system
作者:Masahiro Toyota*、Marcellino Rudyanto、Masataka Ihara
DOI:10.1016/s0040-4039(00)01609-9
日期:2000.11
A novel synthesis of the tricyclo[5.3.1.02,6]undecane compound 16, basic carbon skeleton of gymnomitrane class of sesquiterpenoids, and the transformation into the bicyclo[5.3.1]undecane derivative 18, the AB carbon framework of taxol (6), have been achieved. Beginning with the bicyclo[3.2.1]octane ring system 2, prepared from the cross-conjugated silyl enol ether 1 employing palladium-catalyzed cycloalkenylation
三环[5.3.1.0 2,6 ]十一烷化合物16,裸子萜类香茅类基本碳骨架的新颖合成,以及向紫杉醇的AB碳骨架的双环[5.3.1]十一烷衍生物18的转化(6),已经实现。从使用钯催化的环烯基化反应的交叉共轭甲硅烷基烯醇醚1制备的双环[3.2.1]辛烷环体系2开始,使用sa合成了三环[5.3.1.0 2,6 ]十一烷环体系16促进15的还原环化。转换后16对于羟基甲苯磺酸酯17,碱性处理17得到所需的双环[5.3.1]十一烷衍生物18。有趣的是,还与18一起获得了高张力的氧杂环丁烷19。