A highly enantioselective synthesis of functionalized cyclopentanoids by a formal asymmetric (4+1) annulation strategy was developed. The methodology consists of a stereoselective cyclopropanation reaction between chiral sulfur ylides and 1,3‐dienes followed by a, in situ, stereospecific MgI2‐catalyzed rearrangement of vinylcyclopropanes. This method is distinguished by a remarkable compatibility with
The synthesis of various electron-deficient 1,1-dicarbonyl ester 1,3-dienes substituted in position 2 or 3 of the diene moiety has been developed.
Asymmetric Sulfur-Ylide-Mediated Formal [4+1]-Annulation Reaction: Scope and Mechanism
作者:Sébastien Clergue、Olivier Rousseau、Thierry Delaunay、Geoffroy Dequirez、Trieu-Van Tran、Soumia El Aakchioui、Gabriella Barozzino-Consiglio、Raphaël Robiette
DOI:10.1002/chem.201801874
日期:2018.8.6
A formal [4+1]‐annulation strategy between sulfurylides and 1,3‐dienes was developed to afford functionalized cyclopentanoids. The process consists of a stereoselective cyclopropanation reaction followed, in situ, by a stereospecific MgI2‐catalyzed vinylcyclopropane–cyclopentene rearrangement. The use of chiral sulfurylides provided cyclopentanoids with excellent enantiocontrol. A combined experimental
开发了一种在硫醚和1,3-二烯之间形成正式的[4 + 1]环化策略,以提供功能化的环戊烷类化合物。该过程包括立体选择性环丙烷化反应,然后原位进行立体特异性MgI 2催化的乙烯基环丙烷-环戊烯重排。手性硫的使用为环戊烷提供了优异的对映体控制能力。结合实验和计算机理的研究表明,重排的立体特异性可以由涉及碘化物的双重S N 2反应机理解释。