The oxidative annulation reaction of ethyl 3-oxo-3-phenylpropanoates with internal alkynes proceeds efficiently in the presence of a Ru(II)-catalyst, a copper oxidant and an additive such as AgSbF6 to give poly-substituted furans, which offers a novel method for the selective construction of poly-substituted furans. The reaction has wider substrate scope with simple starting materials, and the desired
3-氧代-3-苯基丙酸乙酯与内炔的氧化成环反应在 Ru( II )-催化剂、铜氧化剂和添加剂(例如 AgSbF 6 )存在下有效进行,得到多取代呋喃,该反应提供了选择性构建多取代呋喃的新方法 该反应具有更广泛的底物范围,起始原料简单,并且以良好至优异的产率制备了所需的四取代呋喃。
Direct Synthesis of Highly Substituted Furans from Acyloins and Active Methylene Compounds Catalyzed by Bismuth Triflate
作者:Kimihiro Komeyama、Yuuki Ohama、Ken Takaki
DOI:10.1246/cl.2011.1103
日期:2011.10.5
Bi(OTf)3 was found to be an effective catalyst for a tandem condensation/cyclization of acyloins and β-diketones or β-keto esters to afford highlysubstituted furans in good yields.