[EN] COMPOUNDS USEFUL IN THE TREATMENT OF DISORDERS ASSOCIATED WITH MUTANT RAS [FR] COMPOSÉS UTILES DANS LE TRAITEMENT DE TROUBLES ASSOCIÉS À RAS MUTANT
Suzuki−Miyaura Cross-Coupling Reactions of Aryl Tellurides with Potassium Aryltrifluoroborate Salts
摘要:
Palladium(O)-catalyzed cross-coupling between potassium aryltrifluoroborate salts and aryl tellurides proceeds readily to afford the desired biaryls in good to excellent yield. The reaction seems to be unaffected by the presence of electron-withdrawing or electron-donating substituents in both the potassium aryltrifluoroborate salts and aryl tellurides partners. Biaryls containing a variety of functional groups can be prepared. A chemoselectivity study was also carried out using aryl tellurides bearing halogen atoms in the same compound. In addition, this new version of the Suzuki-Miyaura cross-coupling reaction was monitored by electrospray ionization mass spectrometry where some reaction intermediates were detected and analyzed.
Palladium nanoparticles immobilized on the magnetic few layer graphene support as a highly efficient catalyst for ligand free Suzuki cross coupling and homo coupling reactions
cross coupling and homo couplingreaction of aryl halides. The magnetic few layer graphene composite was synthesized by using one-step electrochemical exfoliation of graphite foil in aqueous iron (II) ammonium sulfate as electrolyte without using of any additive or corrosive media. Then, Fe2O3@FLG composite was used an efficient support for the immobilization and suitable dispersing of palladium nanoparticles
在这项研究中,我们制备了磁性金属-石墨烯纳米复合材料,用于通过Suzuki交叉偶联和芳基卤化物的均相偶联反应合成取代的联芳基。磁性层少层石墨烯复合材料是通过在水硫酸铁(II)铵盐溶液中一步一步剥落石墨箔而合成的,而无需使用任何添加剂或腐蚀性介质。然后,Fe 2 O 3 @FLG复合材料被用作钯纳米粒子的固定和适当分散的有效载体。获得的Fe 2 O 3 @ [电子邮件保护] 0使用FT-IR,SEM,TEM,EDS,XRD,VSM和ICP-AES分析对纳米复合材料进行了表征。在生产取代的联芳基中,该催化剂的极低负载显示出高活性。它可以简单地从反应混合物中回收并连续六次运行而无需任何预活化即可使用,而不会损失其催化活性或没有观察到任何可检测到的钯浸出过程。
<i>meta</i> C–H Arylation of Electron-Rich Arenes: Reversing the Conventional Site Selectivity
作者:Luo-Yan Liu、Jennifer X. Qiao、Kap-Sun Yeung、William R. Ewing、Jin-Quan Yu
DOI:10.1021/jacs.9b07887
日期:2019.9.18
report the first catalytic system that effectively performs meta C-Harylation of a variety of alkoxy aromatics including 2,3-dihydrobenzofuran and chromane with exclusive meta site-selectivity, thus reversing the conventional site selectivity governed by native electroniceffects. The identification of an effective ligand and modified norbornene (NBE-CO2Me), as well as taking advantage of the statistics
Aromatic substitution. Part XXII. Polarity of aryl radicals
作者:R. A. Abramovitch、O. A. Koleoso
DOI:10.1039/j29690000779
日期:——
The rates of substitution of anisole relative to benzene by arylradicals generated from diazonium tetrafluoroborates and pyridine in homogeneous solution have been measured and follow, qualitatively, the order expected on the basis of the theory of polarised arylradicals. The substituent in the radical affects its permanent polarisation. Apparent contradictions in the literature concerning the behaviour
已经测量了在均匀溶液中苯甲醚相对于苯的取代度,该取代度是由四氟硼酸重氮鎓和吡啶生成的芳基产生的,并且定性地遵循了基于极化芳基自由基理论的预期顺序。自由基中的取代基会影响其永久极化。文献中有关苯甲醚作为底物的行为和对甲氧基苯基自由基的极性的明显矛盾通过使用这种自由基源得以解决。如所预期的,对甲氧基苯基比苯基更具亲核性。间甲氧基苯基不比苯基更具亲电性,并提出了一个解释。p甲苯基是多个亲核比预期的基础上σ p -Me。
CuO-2,2′-Diamino-6,6′-Dimethylbiphenyl Catalyzed Suzuki–Miyaura Coupling Reactions of Arylboronic Acids with Aryl Iodides and Bromides
作者:Yue-Mei Ye、Bin-Bin Wang、Dan Ma、Li-Xiong Shao、Jian-Mei Lu
DOI:10.1007/s10562-010-0418-9
日期:2010.11
CuO-catalyzed Suzuki–Miyaura cross-coupling reactions of arylboronicacids with aryl iodides and bromides using 2,2′-diamino-6,6′-dimethylbiphenyl as the ligand are described in the paper. Under suitable conditions, all reactions gave the desired coupling products in moderate to excellent yields.Graphical Abstract
Efficient heterogeneous Pd/CuFe2O4 nanowires which catalyze cross coupling transformations are described. The protocol is applied to a one-pot synthesis of benzofurans via Sonogashira coupling and an intramolecular etherification sequence.