Addition of pyrroles onto terminal alkynes catalyzed by a dinuclear ruthenium (II) complex
作者:Sze Tat Tan、Yew Chin Teo、Wai Yip Fan
DOI:10.1016/j.jorganchem.2012.02.017
日期:2012.6
alkynes has been catalyzed by a dinuclear rutheniumcomplex, Ru2(CO)4(PPh3)2Br4, resulting in the formation of geminal 2-vinylpyrroles in high yields under mild conditions. Further functionalization with pyrroles or alkynes to afford dipyrrolmethanes or 2,5-bis(vinyl)pyrroles via the vinyl functional group can readily be achieved. A mechanism involving cationic rutheniumcomplexes was proposed based
The Gold-Catalyzed Hydroarylation of Alkynes with Electron-Rich Heteroarenes - A Kinetic Investigation and New Synthetic Possibilities
作者:Jasmin Schießl、Matthias Rudolph、A. Stephen K. Hashmi
DOI:10.1002/adsc.201600940
日期:2017.2.20
The gold‐catalyzed mono‐hydroarylation and two‐fold hydroarylation of alkynes with electron‐rich heteroarenes was analyzed by a 1H NMR kinetic study. The obtained rate constants for the decreasing alkyne concentration provide information on the reactivity of this addition reaction. The examinations show the orthogonal reactivity of gold and a proton for the two reaction steps. The first hydroarylation
金催化单hydroarylation和炔烃的两倍hydroarylation与富电子杂芳烃用分析11 H NMR动力学研究。对于降低的炔烃浓度获得的速率常数提供了关于该加成反应的反应性的信息。检验显示出两个反应步骤中金和质子的正交反应性。第一次氢芳基化仅由金(I)促进,而第二步以质子为前提,该质子可逆地衍生自末端炔烃形成的σ,π-乙炔化物络合物或与溶剂相互作用。根据动力学数据,有可能以中等到良好的产率合成各种单加合物,此外,还探索了带有两个不同取代基的杂二加合物的合成。
Copper-Catalyzed Stereoselective [4 + 2] Cycloaddition of β,γ-Unsaturated α-Keto Esters and 2-Vinylpyrroles in Water
作者:Shuangshuang Zhao、Kuiliang Li、Xiang Sun、Zhenggen Zha、Zhiyong Wang
DOI:10.1021/acs.orglett.2c01544
日期:2022.6.17
An asymmetric [4 + 2] cycloaddition of β,γ-unsaturated α-keto esters with 2-vinylpyrroles in water was developed under the catalysis of a kind of copper complex with a low loading. A series of optically pure 3,4-dihydro-2H-pyran derivatives could be obtained in excellent yields, with high diastereoselectivities and enantioselectivities. The corresponding mechanism was proposed, which was supported
introduces a Pd(II)/LA-catalyzed (LA: Lewis acid) decarboxylative addition reaction for the synthesis of bis(indolyl)methanederivatives. The presence of Lewis acid such as Sc(OTf)3 triggered Pd(II)-catalyzed decarboxylative addition of propiolic acids with indoles to offer the bis(indolyl)methanederivatives in moderate to good yields, whereas neither Pd(II) nor Lewis acid alone was active for this synthesis