Synthesis, characterization and palladium complex formation of pyridinium- and quinolinium-3-acetylides: mesomeric betaines or betaine-stabilized carbenes?
作者:Alexey Smeyanov、Jan C. Namyslo、Eike Hübner、Martin Nieger、Andreas Schmidt
DOI:10.1016/j.tet.2015.07.053
日期:2015.9
3-(bromoethynyl)pyridine with Pd(PPh3)4 gave bis(triphenylphosphine)palladium(II)(pyridin-3-yl-ethynyl) bromide which was finally methylated to give bis(triphenylphosphine)[(1-methylpyridinium-3-yl)ethynyl]palladium(II)bromide triflate. Likewise, bis(triphenylphosphine)palladium(II) (quinolin-3-yl-ethynyl) bromide and bis(triphenylphosphine)((1-methylquinolinium-3-yl)ethynyl)palladium(II)bromide triflate were prepared
CuI-catalyzed Suzuki coupling reaction of organoboronic acids with alkynyl bromides
作者:Shihua Wang、Min Wang、Lei Wang、Bo Wang、Pinhua Li、Jin Yang
DOI:10.1016/j.tet.2011.05.031
日期:2011.7
A CuI-catalyzed Suzuki cross-coupling reaction of organoboron derivatives with alkynyl bromides has been developed. In the presence of CuI (10 mol %) and 8-hydroxyquinoline (20 mol %), organoboron derivatives including aromatic and alkenyl boronic acids, potassium aryltrifluoroborates, and sodium tetraphenylborate reacted smoothly with 1-bromo-2-substituted acetylene to generate the corresponding cross-coupling
已经开发出CuI催化的有机硼衍生物与炔基溴化物的Suzuki交叉偶联反应。在CuI(10 mol%)和8-羟基喹啉(20 mol%)的存在下,有机硼衍生物(包括芳族和烯基硼酸,芳基三氟硼酸钾和四苯基硼酸钠)与1-溴-2-取代的乙炔平稳反应,生成相应的交叉偶联产物在C 2 H 5 OH中具有良好至极好的收率。重要的是要注意,芳族N,O-配体8-羟基喹啉是该反应最有效的配体。
Csp–Csp<sup>3</sup> Bond Formation via Iron(III)-Promoted Hydroalkynylation of Unactivated Alkenes
作者:Yangyong Shen、Bo Huang、Jing Zheng、Chen Lin、Yu Liu、Sunliang Cui
DOI:10.1021/acs.orglett.7b00499
日期:2017.4.7
An iron(III)-promoted hydroalkynylation of unactivated alkenes toward Csp–Csp3 bond formation has been developed. Various alkenes, including mono-, di-, and trisubstituted alkenes, could all smoothly convert to structural diversified alkynes in this chemoselective protocol. Additionally, the scalability was unraveled and the further divergent transformations of products were conducted to demonstrate
An Efficient and Recyclable Magnetic-Nanoparticle-Supported Palladium Catalyst for the Suzuki Coupling Reactions of Organoboronic Acids with Alkynyl Bromides
acetylenes to generate the corresponding cross-coupling products in good to excellent yields in ethanol. In addition, it is possible to recover and reuse the supported palladium catalyst at least 16 times without significant loss of its catalytic activity. palladium catalyst - Suzuki coupling reaction - organoboronic acids - alkynyl bromides - magneticnanoparticles
The first synthesis of heptaarylindole (HAI) has been accomplished using a coupling/ring transformation strategy. Four readily prepared modular units (diarylthiophenes, 2-arylaziridines, arylboronic acids, and arylalkynes) were joined together to provide key ynamide intermediates. Subsequent inverse electron-demand intramolecular [4 + 2] cycloaddition furnished pentaarylindoles (PAIs) regioselectively