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Palladium-catalyzed homo-coupling of boronic acids with supported reagents in supercritical carbon dioxide

Chinese Chemical Letters 2007年第9期18卷 1043-1046页

作者： Lei Zhou Qiu Xiang Xu Huan Feng Jiang [a]College of Chemistry South China University of Technology Guangzhou 510640 China

Palladium-catalyzed homo-coupling of arylboronic acids could proceed smoothly with a commercially available resin functionlised by phosphino or amino group as the ligand in supercritical carbon dioxide thereby offerin... 详细信息

关键词： homo-coupling Palladium scCO2 Bi-aryl

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Inhibition of homo-coupling of Arylboronic Acids in Ligand Free Pd（ll）-Catalyzed Suzuki Reaction

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Chinese Journal of Chemistry 2007年第9期25卷 1326-1329页

作者：陶晓春张月平何天雄沈冬 Laboratory of Organometallic Chemistry East China University of Science and Technology Shanghai 200237 China Laboratory of Chemical Physics East China University of Science and Technology Shanghai 200237 China

A series of solvents were examined for the ligand free Pd（II）-catalyzed Suzuki reaction of 4-bromotoluene with phenylboronic acid. It was found that the PdCl2/i-PrOH system could efficiently inhibit the homo-coupling of phenylboronic acid and give a cross-coupling product in high yields. The substrates with a wide variety of functional groups were tolerated in the system. A possible mechanism for this system was proposed.

关键词： homo-coupling cross-coupling isopropanol aryl bromide arylboronic acid

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A mild Cul-catalyzed glaser-type homo-coupling reaction usingα,α-dibromo-β-dicarbonyl compounds as oxidants

A mild Cul-catalyzed glaser-type homo-coupling reaction usin...

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甘肃省化学会第二十八届年会暨第十届中学化学教学经验交流会

作者： Na Li Tong Shen Xiao-Meng Cui Hao Lv Yong-Hong Guan Xiaohui Fan College of Chemical and Biological Engineering Lanzhou Jiaotong University

Glaser-type oxidative coupling reactions provide easy and efficient access to 1,3-conjugated structures,which are an important class of building blocks with diverse applications in organic chemistry and functional ***,we disclosed a series of novel organic oxidants,a,a-dibromo-β-dicarbonyl compounds,that allow the homo-coupling of terminal alkynes proceeding with catalytic amount of Cul in air at room temperature without addition of palladium species and ligand(Scheme 1).This catalytic system provides an efficient method for the construction of various symmetric 1,3-conjugated diynes and showed good potential in cross-coupling of two different terminal *** addition,the mechanism of this reaction was also investigated,indicating that the α,α-dibromo-β-dicarbonyI compounds most likely serve as both oxidants and ligands in this reaction,and Cu(I)-catalyzed cross-coupling between the in situ formed alkynyl bromide and the terminal alkyne might be the major reaction pathway(Scheme 2).

关键词： Glaser reaction α,α-Dibromo-β-dicarbonyl compound homo-coupling Alkyne

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Revealing efficient catalytic performance of N-CuO_(x) for aerobic oxidative coupling of aliphatic alkynes:A Langmuir-Hinshelwood reaction mechanism

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Nano Research 2022年第7期15卷 6076-6083页

作者： Jun Tang Bowen Jiao Wei Chen Fei Ruan Fengfeng Li Peixin Cui Chao Wan Minh Ngoc Ha Van Noi Nguyen Qingping Ke College of Chemistry and Chemical Engineering Anhui University of TechnologyMaanshan 243002China Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Sciencethe Chinese Academy of SciencesNanjing 210008China VNU Key Laboratory of Advanced Material for Green Growth VNU University of ScienceVietnam National UniversityHanoi 100000Vietnam

O_(x)idative couplings of aliphatic alkynes are crucial for the production of naturally occurring 1,*** we report the novel approach for effective synthesis of unsaturated coordinated N doped copper oxides(N-CuO_(x))catalyst,and uncover that N-CuO_(x) catalyst as an additive-free and cost-effective heterogeneous catalyst has highly catalytic performance for directly oxidative coupling of aliphatic *** key to achieve efficient oxidative coupling of aliphatic alkynes is the synergistic effect of N species and uncoordinated O/Cu species caused by N dopants,which undergoes the Langmuir–Hinshelwood reaction *** N-CuO_(x) catalyst displays~89.1%yield for hexadeca-7,9-diyne under mild conditions and stable reusability(5 cycles),showing significant advances compared with the traditionally copper *** findings highlight the heteroatom dopants that provide a new methodology for designing efficient copper catalysts in synthesis of naturally occurring 1,3-diynes.

关键词： N doped copper oxides(N-CuO_(x)) straight chain alkynes homo-coupling additive-free 1,3-diynes

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Recent advances on iron-catalyzed coupling reactions involving organolithium reagents

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Chinese Chemical Letters 2019年第8期30卷 1463-1467页

作者： Zhuliang Zhong Xiao-Shui Peng Henry N.C.Wong Department of Chemistry and State Key Laboratory of Synthetic Chemistry The Chinese University of Hong Kong

Owing to their inexpensive and environmentally friendly properties,iron-based catalysts have been actively investigated for new organic *** this account,we summarized our recent results on iron-catalyzed cross-coupling reactions and homo-coupling *** iron-based catalysts,we constructed diverse carbon-carbon bonds,i.e.,C(sp^2)-C(sp^3),C(sp^3)-C(sp^3),C(sp^3)-C(sp^2)and C(sp^2)-C(sp^2)*** order to demonstrate the usefulness of our iron protocol,we also carried out these reactions on gram-scale reactions,leading to good yields.

关键词： Iron-catalyzed Cross-coupling homo-coupling Organolithium Gram-scale

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