Copper- or Phosphine-Catalyzed Reaction of Alkynes with Isocyanides. Regioselective Synthesis of Substituted Pyrroles Controlled by the Catalyst
摘要:
The copper-catalyzed reaction of isocyanides (CNCH(2)EWG(1)) 1 with electron-deficient alkynes (RC equivalent to CEWG(2)) 2 gave the 2,4-di-EWG-substituted pyrroles 3 selectively, whereas the phosphine-catalyzed reaction of 1 with 2 afforded the 2,3-di-EWG-subsituted pyrroles 4. Accordingly, regioselective synthesis of substituted pyrroles has been achieved by merely choosing the catalyst.
K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>-mediated metal-free direct P–H/C–H functionalization: a convenient route to benzo[b]phosphole oxides from unactivated alkynes
The first metal-free, facile and K2S2O8-mediated radical addition/cyclization of unactivated alkynes with diarylphosphine oxides has been developed, affording a general and practical procedure to construct valuable benzo[b]phosphole oxides via sequential...
Copper(<scp>i</scp>)/phosphine-catalyzed tandem carboxylation/annulation of terminal alkynes under ambient pressure of CO<sub>2</sub>: one-pot access to 3a-hydroxyisoxazolo[3,2-a]isoindol-8(3aH)-ones
作者:Jia-Ning Xie、Bing Yu、Chun-Xiang Guo、Liang-Nian He
DOI:10.1039/c5gc00926j
日期:——
An efficient method for the synthesis of 3a-hydroxyisoxazolo[3,2-a]isoindol-8(3aH)-ones from CO2, terminal alkynes, EtBr, and NHPI (N-hydroxyphthalimide) was developed through the tandem carboxylation/annulation strategy catalyzed by copper(I)/phosphine system. This one-pot multicomponent...
Silver-Mediated Oxidative C–H/P–H Functionalization: An Efficient Route for the Synthesis of Benzo[<i>b</i>]phosphole Oxides
作者:Yun-Rong Chen、Wei-Liang Duan
DOI:10.1021/ja407373g
日期:2013.11.13
A Ag-mediated C-H/P-H functionalization reaction of arylphosphine oxides with internal alkynes was described for the direct preparation of benzo[b]phosphole oxides with a high yield. An unusual aryl migration on the P-atom derived from a C-P bond cleavage and a new C-P bond formation was also observed and demonstrated to proceed via the radical process.
描述了芳基氧化膦与内部炔烃的 Ag 介导的 CH/PH 官能化反应,用于以高产率直接制备苯并 [b] 磷氧化物。还观察到来自 CP 键断裂和新 CP 键形成的 P 原子上不寻常的芳基迁移,并证明是通过自由基过程进行的。
Synthesis of Ethyl Arylpropiolates through Palladium-Catalyzed Cross-Coupling Reactions of Aryl Iodides with In Situ Generated Lithium Tetrakis(ethoxycarbonylethynyl)indates