Photoinduced C-H direct arylation of unactivated arenes
作者:Jian Kan、Shijun Huang、Huaiqing Zhao、Jin Lin、Weiping Su
DOI:10.1007/s11426-015-5377-y
日期:2015.8
Two general protocols have been developed for the photoinduced, metal-free directarylation of unactivatedarenes with aryl iodide. Both methods gave good to excellent yields for most substrates. Notably, the C-F bond in method A and the C-F, C-Cl, and C-Br bonds in method B could survive the arylation reaction. These methods offered excellent options for syntheses of biaryls.
benzimidazole-based ionic Pd(II)-NHC complexes (NHC:$N$-heterocyclic carbene) is presented. The structures of the complexes are as follows: [NHC-PdBr$_3}$]$^-}$[NHC]$^+}$. The ionicpalladium(II)-NHC complexes were synthesized in high yields and were fully characterized by nuclear magnetic resonance spectroscopy, X-ray diffraction, LC-MS/MS, and elemental analysis. These complexes have been identified
A series of seven-membered ditopic ring-expanded N-heterocycliccarbene (dre-NHC) precursors, bearing sterically demanding and electron-rich aryl groups, were synthesised in moderate yields via the reaction of 1,2,4,5-tetrakis(bromomethyl)benzene with the corresponding N,N′-diarylformamidines in the presence of K2CO3 in acetonitrile under an air atmosphere. All new compounds were characterised by HRMS
一系列的7元双中心环扩展ñ -杂环卡宾(DRE-NHC)的前体,轴承空间要求和富电子的芳基,是在中等产率合成通过的1,2,4,5-四反应(在空气气氛下,在乙腈中,在K 2 CO 3存在下,将溴甲基)苯与相应的N,N'-二芳基甲am 。所有新化合物均通过HRMS,NMR光谱和微分析以及化合物1c的X射线晶体学进行了表征。还研究了用于芳基氯与各种硼酸的Suzuki-Miyaura偶联反应的有效催化体系的发展。原位生成的dre-NHC配体。
Nickel-Catalyzed Direct Cross-Coupling of Aryl Fluorosulfates with Aryl Bromides
A one-pot, direct cross-coupling of aryl fluorosulfate with aryl bromide, which is step-economical and avoids the use of a preprepared/commercial organometallic reagent, could be accomplished by performing the reaction in THF at room temperature in the presence of nickel catalyst, magnesium turnings, and lithium chloride, giving rise to the corresponding biaryls in moderate to good yields with reasonable
A straightforward cross-coupling of aryl thioether with aryl bromide with the aid of nickel salt, magnesium, and lithium chloride in tetrahydrofuran at ambient temperature was accomplished. The one-pot reactions proceeded efficiently via C–S bond cleavage to produce the desired biaryls in modest to good yields, avoiding the use of pregenerated or commercial organometallic reagents.