Asymmetric total synthesis of ent-heliespirones A & C
作者:Chong Huang、Bo Liu
DOI:10.1039/c0cc00481b
日期:——
A concise 8-step synthetic route toward ent-heliespirones A & C is described. This synthetic strategy features a highly diastereoselective palladium-catalyzed Michael addition to form 3,5-trans lactone and a final biomimetic intramolecular oxa-spirocyclization.
本文介绍了一条 8 步合成ent-heliespirones A 和 C 的简明路线。这一合成策略的特点是通过高度非对映选择性的钯催化迈克尔加成反应生成 3,5-反式内酯,最后进行仿生分子内氧杂螺环化反应。
Racemic and enantioselective total synthesis of heliespirones A & C
作者:Chong Huang、WenHan Zhang、Bo Liu
DOI:10.1007/s11426-010-4173-y
日期:2011.1
An account of the totalsynthesis of (±)-, (+)-heliespirone A and (±)-, (−)-heliespironeC is presented. In the first-generation totalsynthesis, we found rac-24a could be easily transformed to rac-heliespirones A & C in a biomimic way. Taking the disappointing diastereoselectivity of prenylation from 3 to 4, the nonselective dihydroxylation from 4 to 5 and the lenthy route in strategy A into account