Rhodium-catalyzed tunable oxidative cyclization toward the selective synthesis of α-pyrones and furans
作者:Jiaping Wu、Dongxu Wang、Yanjun Wan、Cheng Ma
DOI:10.1039/c5cc09137c
日期:——
tunable oxidative cyclization of readily available N-tosylacrylamides and diazo compounds is presented, which offeres a novel method for the selective construction of fully substituted [small alpha]-pyrones and furans in...
Modular Synthesis of Multisubstituted Furans through Palladium-Catalyzed Three-Component Condensation of Alkynylbenziodoxoles, Carboxylic Acids, and Imines
作者:Junliang Wu、Naohiko Yoshikai
DOI:10.1002/anie.201504687
日期:2015.9.14
regiocontrolled synthesis of a multisubstitutedfuran is achieved through Pd(OAc)2‐catalyzed room‐temperature condensation of an alkynylbenziodoxole, a carboxylicacid, and an enolizable ketimine, which contribute to C1, CO, and C2 fragments, respectively, to the furan skeleton. The reaction tolerates a broad range of functional groups in each of the reaction components, and enables highly modular and flexible
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.
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。