Electrophilic Cyclizations of 2-Fluoroalk-3-yn-1-ones: Room-Temperature Synthesis of Diversely 2,5-Disubstituted 3,4-Fluorohalofurans
作者:Yan Li、Kraig A. Wheeler、Roman Dembinski
DOI:10.1002/ejoc.201100344
日期:2011.5
A 5-endo-dig halocyclization of 2-fluoroalk-3-yn-1-ones with the use of N-iodo- and N-bromosuccinimide, in the presence of gold chloride/zinc bromide (5:20 mol-%, dichloromethane), under ambient conditions, provides a facile method for the synthesis of 2,5-disubstituted 3-bromo-4-fluoro- and 3-fluoro-4-iodofurans. The sequential procedure starts at monofluorination of the alk-1-en-3-yn-1-yl silyl ethers
在氯化金/溴化锌(5:20 mol-%,二氯甲烷)存在下,使用 N-碘-和 N-溴代琥珀酰亚胺对 2-fluoroalk-3-yn-1-ones 进行 5-endo-dig 卤环化),在环境条件下,为合成 2,5-二取代的 3-溴-4-氟-和 3-氟-4-碘呋喃提供了一种简便的方法。顺序程序从 alk-1-en-3-yn-1-yl 甲硅烷基醚与 Selectfluor 的单氟化开始,并以良好的总产率 (62-78%) 进行。