Formal Homoiodo Allylsilane Annulations: Dual Total Syntheses of (±)-Hirsutene and (±)-Capnellene
作者:Shou-Jie Shen、Wei-Dong Z. Li
DOI:10.1021/jo4009854
日期:2013.7.19
linear triquinane sesquiterpenes, were achieved via a formal [3 + 2] annulation strategy, as illustrated schematically. Cyclic homoiodo allylsilanes were employed as key bifunctional synthons in the synthesis, which were readily prepared from the corresponding cyclopropanated cyclopentenones. A formal [3 + 3] annulation approach for the elaboration of the bicyclic framework of the Eudesmane sesquiterpenoids
如图所示,通过一种正式的[3 + 2]环化策略,可以实现两种典型的线性三喹烷倍半萜烯(±)-hirsutene和(±)-capnellene的双重全合成。环状同碘代烯丙基硅烷被用作合成中的关键双官能合成子,它们很容易从相应的环丙烷化的环戊烯酮制备。还开发了一种正式的[3 + 3]圆环方法,用于基于这种合成子来拟制Eudesmane倍半萜的双环骨架。