Palladium-Catalyzed Oxidative Alkoxylation of α-Alkenyl β-Diketones To Form Functionalized Furans
作者:Xiaoqing Han、Ross A. Widenhoefer
DOI:10.1021/jo035576w
日期:2004.3.1
and a stoichiometric amount of CuCl2 (2.2 equiv) in dioxane at 60 °C for 12 h formed 3-isobutyryl-2-isopropyl-5-methylfuran in 77% isolated yield. A number of α-alkenyl β-diketones underwent oxidative alkoxylation under these conditions to form 2,3,5-trisubsituted furans in moderate to good yield.
在60 ℃用催化量的PdCl 2(CH 3 CN)2(5 mol%)和化学计量的CuCl 2(2.2当量)在二恶烷中处理4-烯丙基2,6-二甲基-3,5-庚二酮℃下12小时形成3-异丁酰基-2-异丙基-5-甲基呋喃,分离产率为77%。在这些条件下,许多α-烯基β-二酮经过氧化烷氧基化反应以中等至良好的产率形成2,3,5-三取代的呋喃。