Increasing the Structural Span of Alkyne Metathesis
作者:Peter Persich、Josep Llaveria、Rudy Lhermet、Teresa de Haro、Robert Stade、Azusa Kondoh、Alois Fürstner
DOI:10.1002/chem.201302320
日期:2013.9.23
new generation of alkyne metathesis catalysts, which are distinguished by high activity and an exquisite functional group tolerance, allows the scope of this transformation to be extended beyond its traditional range. They accept substrates that were previously found problematic or unreactive, such as propargyl alcohol derivatives, electron‐deficient and electron‐rich acetylenes of various types, and
作者:Birte Haberlag、Matthias Freytag、Constantin G. Daniliuc、Peter G. Jones、Matthias Tamm
DOI:10.1002/anie.201207772
日期:2012.12.21
Now even terminal: The 2,4,6‐trimethylbenzylidyne complexes [MesCMOC(CF3)2Me}3] (M=Mo, W) were synthesized from [Mo(CO)6] and [W(CO)6], respectively. The molybdenum complex is an efficient catalyst for the metathesis of internal and terminalalkynes and also for the ring‐closing metathesis of internal and terminal α,ω‐diynes at room temperature and low catalyst concentrations.
Enantioselective Epoxidation of Conjugated <i>cis</i>-Enynes by Chiral Dioxirane
作者:Christopher P. Burke、Yian Shi
DOI:10.1021/jo070205r
日期:2007.5.1
This paper describes a highly chemo- and enantioselectiveepoxidation of conjugated cis-enynes using readily available glucose-derived ketone 2 as catalyst and Oxone as oxidant to form cis-propargyl epoxides in high ee's. The interaction between the alkyne group of the substrate and the oxazolidinone moiety of the ketone catalyst as well as the interactions between the substituents on enynes and the
Tuning the Catalytic Alkyne Metathesis Activity of Molybdenum and Tungsten 2,4,6-Trimethylbenzylidyne Complexes with Fluoroalkoxide Ligands OC(CF<sub>3</sub>)<sub><i>n</i></sub>Me<sub>3–<i>n</i></sub> (<i>n</i> = 0–3)
作者:Celine Bittner、Henrike Ehrhorn、Dirk Bockfeld、Kai Brandhorst、Matthias Tamm
DOI:10.1021/acs.organomet.7b00519
日期:2017.9.11
The molybdenum and tungsten 2,4,6-trimethylbenzylidyne complexes [MesC≡MOC(CF3)nMe3–n}3] (M = Mo: MoF0, n = 0; MoF3, n = 1; MoF6, n = 2; MoF9, n = 3; M = W: WF3, n = 1; Mes = 2,4,6-trimethylphenyl) were prepared by the reaction of the tribromides [MesC≡MBr3(dme)] (dme = 1,2-dimethoxyethane) with the corresponding potassium alkoxides KOC(CF3)nMe3–n. The molecular structures of all complexes were established
钼和钨2,4,6-三甲基苄二炔络合物[MesC≡MOC(CF 3)n Me 3– n } 3 ](M = Mo:MoF0,n = 0;MoF3,n = 1;MoF6,n= 2;MoF 9,n= 3; M = W:WF 3,n= 1; Mes = 2,4,6-三甲基苯基)通过三溴化物[MesC 3 MBr 3(dme)](dme = 1)反应制备。,2-二甲氧基乙烷)和相应的烷氧基钾KOC(CF 3)n Me 3– n。通过X射线衍射分析确定了所有配合物的分子结构。研究了在内部和末端炔烃的复分解和闭环炔烃复分解反应中生成的亚烷基配合物的催化活性,显示出对烷氧化物配体氟含量的强烈依赖性。通过涉及2-丁炔的复分解模型反应的DFT计算合理化了不同的催化性能。由于计算结果预测了通过增加氟化度可稳定金属环丁二烯(MCBD)中间体,因此用3-己炔处理MoF9可得到MCBD配合物[(C 3 Et 3)Mo
Cyclization of Terminal Diynes Catalyzed by Thiolate-Bridged Diruthenium Complexes: A Simple Synthetic Route toendo-Macrocyclic (Z)-1-En-3-ynes