“<i>Syn-Effect</i>” in the Desilylation Reaction of γ-Silylated Allylic and Vinylic Sulfones
作者:Samar Kumar Guha、Yutaka Ukaji、Katsuhiko Inomata
DOI:10.1246/cl.2003.1158
日期:2003.12
The desilylation reaction of γ-silylated allylic sulfones was found to proceed through γ-silylated (E)-vinylic sulfones to afford the corresponding allylic sulfones by treatment with DBU and H2O. The Z/E ratio of the resulting allylic sulfones varied according to the γ-substituents of the γ-silylated sulfones. This stereochemical outcome was rationalized by “syn-effect.”
研究发现,γ-硅烷化的烯丙基砜通过γ-硅烷化的(E)-乙烯基砜的脱硅反应,在DBU和H2O处理下得到相应的烯丙基砜。所得烯丙基砜的Z/E比率会根据γ-硅烷化砜的γ-取代基的不同而变化。这一立体化学结果可以通过“顺效应”来解释。