Efficient formal syntheses of (±)-Asterisca-3(15),6-diene, a natural product with a bicyclo[6.3.0]undecane skeleton, and (±)-Pentalenene, a natural product with a tricyclo[6.3.0.04,8]undecane skeleton, have been achieved by using Rh(I)-catalyzed [(5+2)+1] cycloaddition. The [(5+2)+1] reaction provides an expeditious approach to reach the bicyclic cyclooctenone 4, which was quickly transformed (via
高效的形式合成具有双环[6.3.0]
十一烷骨架的
天然产物(±)-Asterisca-3(15),6-二烯和具有
三环[6.3.0.0]
天然产物的(±)-
戊烯4,8 ]
十一烷骨架,已通过使用Rh(I)催化的[(5 + 2)+1]环加成反应获得。[(5 + 2)+1]反应提供了一种快速方法来达到双环环
辛烯酮4,该环
辛烯酮4迅速转变(通过
硼氢化然后氧化)成二酮14,这是全合成(±)-Asterisca的关键高级中间体-3(15),6-二烯 通过进一步的转化,将14转化为二烯18,这是用于全合成(±)-
戊烯的高级中间体。