The Au(I)-catalyzed cyclization of hydroxyallylic ethers to form tetrahydropyrans is reported. Employing (acetonitrile)[(o-biphenyl)di-tert-butylphosphine]gold(I) hexafluoroantimonate, the cyclization reactions were complete within minutes to hours, depending on the substrate. The reaction progress was monitored by GC, and comparisons between substrates demonstrate that reactions of allylic alcohols are faster than the corresponding ethers. Additionally, it is reported that Reaxa QuadraPureTM MPA is an efficient scavenging reagent that halts the reaction progress.
报道了Au(I)催化的
氢氧烯丙基醚的环化反应,形成
四氢吡喃。使用(acetonitrile)[(
o-
联苯)二-
叔-丁基膦]
金(I)六
氟安替酸盐,环化反应在几分钟到几小时内完成,取决于底物。通过气相色谱监测了反应进展,对底物之间的比较表明,
烯丙基醇的反应速度比相应的醚快。此外,报道了Reaxa QuadraPure
TM MPA是一种高效的清除剂,可以停止反应进展。