作者:Maria Zlotorzynska、Huimin Zhai、Glenn M. Sammis
DOI:10.1021/ol802142k
日期:2008.11.6
A new oxygen-centered radical cyclization onto silyl enol ethers has been developed and utilized for the synthesis of versatile siloxy-substituted tetrahydrofurans. The reactions display excellent chemoselectivity for cyclization onto the electron-rich silyl enol ether when competing terminal alkene cyclization, 1,5-hydrogen abstraction, and beta-fragmentation pathways are present. The increased chemoselectivity
已经开发了一种新的以氧为中心的自由基环化到甲硅烷基烯醇醚上,并用于合成通用的甲硅烷氧基取代的四氢呋喃。当存在竞争性末端烯烃环化,1,5-氢抽象和β片段化途径时,反应显示出优异的化学选择性,可环化到富电子的甲硅烷基烯醇醚上。化学选择性的提高还允许合成四氢吡喃,这是一种具有挑战性的底物类型,由于竞争性的1,5-氢提取,因此使用氧中心自由基烯烃环化反应可进入该底物类别。