共查询到20条相似文献,搜索用时 0 毫秒
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LIN Li LI Sheng-hai JIANG Ri-hua .Key Laboratory of Ecomaterials Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun P.R.China .College of Chemistry Jilin University Changchun 《高等学校化学研究》2011,(4):589-591
A microwave-accelerated Suzuki coupling procedure was developed via guanidinium ionic liquids(GILs) stabilized Pd-micelle.The Pd micelle/GILs play a key role in enhancing the activity,due to the highly dispersed Pd active sites and the phase transfer function of GILs,which ensures the adsorption of reactants and facilitates the translation of the intermediates to the surface of the micelle. 相似文献
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Novel β-C-disaccharides containing a three carbon linkage using exo-glycal as the precursor were prepared stereoselectively. The synthesis was achieved by the tandem reactions of the stereoselective hydroboration of exo-glycal and Suzuki cross-coupling reaction with an iodovinyl sugar, and followed by hydrogenated deprotection under the catalysis of Pd(OH)2/C. 相似文献
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3-芳基取代噻吩大多是电致发光材料的前体化合物. 催化剂摩尔分数为0.5% 的二茂铁亚胺环钯化合物在DMF/K3PO4/80 ℃条件下, 能够有效地催化3-噻吩硼酸同芳基碘和芳基溴的Suzuki反应, 方便地合成系列3-芳基噻吩衍生物. 此方法操作简便, 不需要加入过量的3-噻吩硼酸, 催化剂用量小. 化合物3b, 3c和3d的发射光谱和激发光谱表明, 此类化合物具有潜在的发光应用性能. 相似文献
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Lin BAI Jin Xian WANG* College of Chemistry & Chemical Engineering Northwest Normal University Lanzhou 《中国化学快报》2004,15(3)
Suzuki coupling is probably the most versatile approach among the cross-coupling reactions and the reaction has long been the subject of intensive work in the area of transition-metal chemistry1. In recent years, various modifications involving the catalyst, solvents, bases, reaction conditions and synthetic technique have been developed 2. The Suzuki cross-coupling reaction in water is more safe, economical. It is an environmentally friendly alternative in organic synthesis. The use of w… 相似文献
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A practical procedure for palladium catalyzed Suzuki cross-coupling reaction of arylboronic acids with aryl halides, including aryl chlorides in molten tetra-n-butylammonium bromide (TBAB) was developed. The reaction exhibits high efficiency and functional group tolerance. The recovery of the catalyst and molten n-Bu4NBr was also investigated. 相似文献
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Four aryl-guanidines(AG)were synthesized and used for the palladium-catalyzed Suzuki cross-coupling reaction to test the catalytic activity.In the presence of steric bulk AG,when aryl bromide and arylb... 相似文献
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水介质中高分子配体负载微粒钯催化Suzuki偶联反应 总被引:1,自引:0,他引:1
对Wang树脂进行改性,制备了高分子负载纳米钯催化剂,并将其应用于水介质中卤代芳烃与芳硼酸的Suzuki偶联反应。 以溴苯和苯硼酸的偶联反应为模型,考察了溶剂、温度、碱种类、催化剂用量对反应的影响,确定较佳的反应条件为:n(C6H5Br)∶n(C6H5B(OH)2)∶n(WRP-Pd)∶n(K2CO3)∶n(TBAB)=1.0∶1.5∶0.005∶2.0∶0.5,反应温度100℃, 反应时间4 h。 用氯代芳烃代替溴代芳烃反应时,延长反应时间,也能得到较高产率。 催化剂经过简单的过滤洗涤后,重复使用4次活性无明显降低。 相似文献
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Peracetylated glycals were treated with terminal alkyne derivatives under Lewis acid catalysis to result in the formation of the pure α- or β- anomerically substituted hex-2-enopyranosides carrying 2(E)-halogenated olefins. 相似文献
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WANG Yingchun ;LI Xiuying ;LI Yajun ;PAN Yingming ;CHENG Keguang ;WANG Hengshan 《高等学校化学研究》2014,30(4):614-618
The authors presented an efficient method for the palladium-catalyzed Suzuki cross-coupling reaction with the simultaneous reduction of the aldehyde to a hydroxymethyl group.This method allows halide substituted aryl aldehydes to readily react with arylboronic acids,producing polycyclic aromatic alcohols in moderate to good yields.The reaction was catalyzed by Pd(OAc)2(3%,molar fraction) at 150 ℃ in the presence of 6%(molar fraction)1,4-diazabicyclo[2.2.2]octane(DABCO) and 3 times the molecular weight of K2CO3 in the mixture solvent of N,N-dimethylformamide(DMF)/H2O [V(DMF)∶ V(H2O)=5∶1]. 相似文献
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Jean Guillon Jean-Michel Leger Cecilia Dapremont Lou Apollonia Denis Pascal Sonnet Stéphane Massip 《Supramolecular chemistry》2013,25(5):319-329
The synthesis of new 25,27-dialkyloxy-5,17-diarylcalix[4]arenes-crown-6 1a–f in 1,3-alternate conformation by Suzuki cross-coupling reaction is reported. Their conformation was determined using 1H, 13C, 2D NMR and ROESY analysis, and X-ray crystallography. Extraction experiments using a two-phase solvent method involving sodium, potassium or cesium picrate showed good extraction of the cesium cation. The X-ray crystal structures of 1,3-alternate 25,27-dipropoxy-5,17-diphenylcalix[4]arene-crown-6 ether 1a and its cesium picrate complex were established. Solid-state data were used to determine the complexation behavior of these new ligands. The efficiency of calixarenes 1a–f for cesium ion extraction could be ascribed to the rigidity and flatness linkages caused by the aryl groups at the lower rim of the aromatic moieties in the calixarene skeleton. In addition, the introduction of these aromatic moieties in positions 5 and 17 enhanced the solubility of the metal complexes in organic media. 相似文献
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The coupling reaction of (E)-β-bromovinyl tellurides with terminal alkynes by using catalyst of PdCl2(PPh3)2-CuI in the presence of Et3N as a base give the corresponding 1, 3-enynyl tellurides 相似文献
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Gang LU Robert FRANZEN Xiao Jing YU You Jun XU 《中国化学快报》2006,17(4):461-464
Flurbiprofen 1, an excellent nonsteroidal antiinflammatory drug, was synthesized in 5 steps in 69% overall yield. The key step of constructing the biaryl fragment was successfully achieved via Pd/C-catalyzed Suzuki coupling reaction in water using sodium tetraphenylborate as phenylation reagent. 相似文献
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在微波促进下, 利用酮糖(1)及糖酸内酯(4)与叶立德(2, Ph3PCHCOOEt)的Wittig反应, 立体选择性地合成了糖基烯丙酸酯类化合物(3和5), 反应效率显著提高, 反应时间由原来的20 h缩短为10 min; 并且研究了不同反应溶剂对反应立体选择性的影响. 提供了一种高效、 简便合成含有烯丙酸酯类高碳糖衍生物的方法. 相似文献
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1-Alkynes react with Cp2Zr(H)Cl (Cp= η-C5H5) giving vinylzirconium complexes, which are trapped with diarylditellurides to afford (E)-vinylic tellurides. 相似文献