constructed by a Bu3Al-promoted Claisen rearrangement. Computational studies indicated that the exocyclic vinyl ether undergoes a [3,3] sigmatropic process via a chairlike transition state to afford exclusively the Z-double bond in the newly generated 8-membered ring with a high level of chirality transfer.
通过Bu3Al促进的Claisen重排构建了具有必要的立体
化学和官能团的micandilactone A(1)的7-8双环系统。计算研究表明,环外
乙烯基醚通过椅子状过渡态经历了[3,3]σ过程,从而在新生成的8元环中仅提供Z-双键,且具有高
水平的手性转移。