Palladium-Catalyzed C(sp2)-H Bond Alkylation of Ketoximes by Using the Ring-Opening of Epoxides
作者:Dan-Dan Li、Liang-Feng Niu、Zhi-Yu Ju、Zhihong Xu、Changzeng Wu
DOI:10.1002/ejoc.201600335
日期:2016.6
A palladium-catalyzed ortho-directed alkylation of O-methyl ketoximes that proceeds through a regioselective ring-opening reaction of epoxides has been demonstrated. This C(sp2)–H activation/alkylation protocol was carried out in pivalic acid/1,1,1,3,3,3-hexafluoro-2-propanol (PivOH/HFIP, 2:8) as the solvent and was applied to various O-methyl ketoximes that contain either electron-donating or electron-withdrawing
钯催化的 O-甲基酮肟的邻位定向烷基化反应通过环氧化物的区域选择性开环反应进行。该 C(sp2)–H 活化/烷基化方案在新戊酸/1,1,1,3,3,3-六氟-2-丙醇(PivOH/HFIP,2:8)作为溶剂中进行,并应用于到各种含有给电子或吸电子基团的 O-甲基酮肟。此外,在该烷基化反应中使用了不同类型的环氧化物,该反应顺利进行,以中等至良好的收率得到相应的产物。