发现Pd [(s)-3-C 3 H 5 -4-(C 5 H 5 CH 2)-1-(2,6- i Pr 2 C 6 H 3)-C 3 H 3 N 2 ](C 5 H 5 N)Br 2衍生自l-苯丙氨酸是有氧条件下短时间内反应的炔烃无铜和无膦的Sonogashira反应的有效预催化剂。此外,钯化合物将被再利用以催化由Sonogashira反应制得的炔烃的加氢芳基化,这首先使Sonogashira /加氢芳基化顺序反应成功。炔的芳基化具有高的区域和立体选择性,并且仅观察到炔的反芳基化。没有ž / Ë在系统中观察到烯烃的异构化。
Hydroarylation of aryl-substituted alkynes with simple and substituted arenes was conducted in the presence of trifluoroacetic acid in dichloromethane without any metal catalysts or additives. Electron-rich arenes coupled with aryl-substituted alkynes to give 1,1-diarylalkenes in good to high yields.
Thermodynamically- and kinetically-controlled Friedel–Crafts alkenylation of arenes with alkynes using an acidic fluoroantimonate(v) ionic liquid as catalyst
作者:Doo Seong Choi、Jin Hong Kim、Ueon Sang Shin、Ravindra R. Deshmukh、Choong Eui Song
DOI:10.1039/b705719a
日期:——
By employing superacidic fluoroantimonate ionic liquid (IL), [bmim][Sb2F11], as catalyst, not only thermodynamically-controlled but also kinetically-controlled FriedelâCrafts alkenylations of arenes with alkynes have been realized for the first time.
Metal Triflate-Catalyzed Regio- and Stereoselective Friedel–Crafts Alkenylation of Arenes with Alkynes in an Ionic Liquid: Scope and Mechanism
作者:Mi Young Yoon、Jin Hong Kim、Doo Seoung Choi、Ueon Sang Shin、Jin Yong Lee、Choong Eui Song
DOI:10.1002/adsc.200700039
日期:2007.7.2
In the metaltriflate-catalyzed hydroarylation of alkynes, employing an ionicliquid dramatically enhanced the catalytic activities, resulting in broadening the scope of substrates (arenes and alkynes). In some cases, even reactions that were not possible in conventional organic solvents proceeded smoothly in ionicliquids. Moreover, the ionicliquid phase containing catalyst could be readily recovered
在金属三氟甲磺酸酯催化的炔烃加氢芳基化中,采用离子液体显着增强了催化活性,从而扩大了底物(芳烃和炔烃)的范围。在某些情况下,甚至在常规有机溶剂中不可能发生的反应在离子液体中也能顺利进行。而且,通过在反应后简单地倾析有机层,可以容易地回收含离子液体的催化剂,并且可以将其重新用于随后的运行中而没有任何明显的活性损失。包括反应中间体的13 C NMR分析和同位素实验在内的机理研究首次证实,这种类型的反应是通过乙烯基阳离子中间体进行的。
Pd-Catalyzed Cross-Coupling of Highly Sterically Congested Enol Carbamates with Grignard Reagents via C–O Bond Activation
作者:Zicong Chen、Chau Ming So
DOI:10.1021/acs.orglett.0c01127
日期:2020.5.15
The palladium-catalyzed cross-coupling reaction of enol carbamates to construct highly sterically congested alkenyl compounds is presented for the first time. This protocol demonstrates the potential of using thermally stable and highly atom-economic enol electrophiles as building blocks in bulky alkene synthesis. This reaction accommodates a broad substrate scope with excellent Z/E isomer ratios,
FeCl<sub>3</sub>-Catalyzed Alkenylation of Simple Arenes with Aryl-Substituted Alkynes
作者:Ruoshi Li、Sunewang R. Wang、Wenjun Lu
DOI:10.1021/ol070737u
日期:2007.5.1
An addition of electron-rich arenes to aryl-substituted alkynes to form 1,1-diaryl alkenes is carried out in the presence of FeCl3 as catalyst under mild conditions.