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.
DOI:
10.1021/ja051875m
作为产物:
描述:
1,4-bis[(ethoxycarbonyl)(triphenylphosphoranylidene)acetyl]benzene 500.0 ℃
、1.33 Pa
条件下,
反应 2.0h,
以36%的产率得到1,4-bis(ethoxycarbonylethynyl)benzene
参考文献:
名称:
快速真空热解稳定的磷化氢。第16部分。共轭聚合物构建的模型研究
摘要:
一系列双(酰化物)与酰氯的反应已用于制备双(氧酰化物)11-15。同样,一系列简单的叶立德与双(酰氯)反应,生成具有异构体结构的双(氧酰)19-27。第一种类型的快速真空热解(FVP)导致Ph 3 P挤出,而不是预期的Ph 3 PO挤出,而第二种类型的六个实例确实在500°C的FVP压力下挤出Ph 3 PO以获得双(炔烃)28。还已经制备了相应的双(三丁基phosph)的实例,但是使用逐步方法构建四(氧代酰)31的尝试是失败的。完全分配给出了其中的六个双(氧酰化物)的13 C NMR光谱。
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
Flash vacuum pyrolysis of stabilised phosphorus ylides. Part 16. Model studies for the construction of conjugated polymers
作者:R.Alan Aitken、Martin J Drysdale、Lawrence Hill、Keith W Lumbard、James R MacCallum、Shirley Seth
DOI:10.1016/s0040-4020(99)00611-0
日期:1999.9
Reaction of a range of bis(ylides) with acid chlorides has been used to prepare the bis(oxoylides) 11–15. Similarly a range of simple ylides react with bis(acid chlorides) to give bis(oxoylides) 19–27 with the isomeric structure. Flashvacuumpyrolysis (FVP) of one example of the first type results in extrusion of Ph3P rather than the expected Ph3PO while six examples of the second type do extrude
一系列双(酰化物)与酰氯的反应已用于制备双(氧酰化物)11-15。同样,一系列简单的叶立德与双(酰氯)反应,生成具有异构体结构的双(氧酰)19-27。第一种类型的快速真空热解(FVP)导致Ph 3 P挤出,而不是预期的Ph 3 PO挤出,而第二种类型的六个实例确实在500°C的FVP压力下挤出Ph 3 PO以获得双(炔烃)28。还已经制备了相应的双(三丁基phosph)的实例,但是使用逐步方法构建四(氧代酰)31的尝试是失败的。完全分配给出了其中的六个双(氧酰化物)的13 C NMR光谱。