Sulfur as a Bridge: Synthesis of Medium Rings via a Bicyclic Sulfonium Ion
作者:Hongwei Zhou、Yanpeng Xing、Le Liu、Junjie Hong
DOI:10.1002/adsc.201100502
日期:2011.11
A facile and efficient synthesis of medium rings via a bicyclic sulfonium ion was developed. Spectroscopic evidence for the formation of an intermediate sulfonium moiety is provided. The sulfur atom served as a “bridge” to access the medium ring system and could be removed after use via a Ramberg–Bäcklund process. As a result of the readily available starting materials, simple operation, and mild conditions