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Tetrahydrofuran Ring-opening with Acyloxyphosphonium Bromide Catalyzed by Zinc Bromide: An Effective Method for the Preparation of 4-Bromobutyl Esters

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Chinese Chemical Letters 2002年第7期13卷 589-592页

作者： hua yue wu Jin Chang DING Shun WANG Department of Chemistry Wenzhou Normal CollegeWenzhou 325027

Catalyzed by zinc bromide, tetrahydrofuran ring can be opened with acyloxyphos- phonium bromide generated in situ to afford 4-bromobutyl esters under mild conditions in good to excellent yields.

关键词： Zinc bromide tetrahydrofuran ring acyloxyphosphonium bromide 4-bromobutyl esters.

A facile synthesis of 2,3-dihydro-2-aryl-4(1H)-quinazolinones catalyzed by scandium(Ⅲ) triflate

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Chinese Chemical Letters 2007年第5期18卷 536-538页

作者： Jiu Xi Chen hua yue wu Wei Ke Su College of Chemistry and Materials Science Wenzhou University Wenzhou 325027 China College of Pharmaceutical Sciences Zhejiang University of Technology Zhejiang Key Laboratory of Pharmaceutical Engineering Hangzhou 310014 China

2,3-Dihydro-2-aryl-4（1H）-quinazolinones were prepared in good yields via condensation of o-aminobenzamide with aldehydes promoted by a catalytic amount of Sc（OTf）3 under mild conditions.

关键词： Scandium(Ⅲ) triflate 2,3-Dihydro-2-aryl-4(1H)-quinazolinones o-Aminobenzamide

Tetrahydrofuran Ring Opening with Acyl Chlorides or Anhydrides Catalyzed by Gallium Triiodides: A Novel and Facile Method for the Preparation of Iodo Esters

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Chinese Chemical Letters 2000年第3期11卷 191-194页

作者： hua yue wu Ren Er CHEN Yong Min ZHANG WenZhou Normal college Wenzhou 325000 Department of Chemistry Zhejiang University at Xixi CampusHangzhou 310028

Tetrahydrofuran ring can be opened with acyl chlorides or anhydrides catalyzed by gallium triiodides to afford iodo esters under mild conditions in good yields.

关键词： tetrahydrofuran ring acyl chloride anhydride gallium triiodides

Gallium trichloride-catalyzed conjugate addition of indole and pyrrole to α,β-unsaturated ketones in aqueous media

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Chinese Chemical Letters 2009年第6期20卷 676-679页

作者： Rong Xu Jin Chang Ding Xi An Chen Miao Chang Liu hua yue wu Wenzhou Vocational and Technical College Wenzhou 325035 PR China College of Chemistry and Materials Science Wenzhou University Wenzhou 325027 PR China

Michael addition of indole and pyrrole to a variety of α, β-unsaturated ketones was efficiently promoted by a catalytic amount of GaCl3 in aqueous media to afford the corresponding products in good to excellent yields.

关键词： Gallium trichloride Michael addition Indole Pyrrole α, β-Unsaturated ketones

Effects of Current Frequency on the Microstructure and Wear Resistance of Ceramic Coatings Embedded with SiC Nano-particles Produced by Micro-arc Oxidation on AZ91D Magnesium Alloy

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Journal of Materials Science & Technology 2010年第10期26卷 865-871页

作者： yue Yang and hua wu Key Laboratory of Advanced Structural Materials,Ministry of Education,Changchun University of Technology,Changchun 130012,China Key Laboratory of Advanced Structural Materials Ministry of Education Changchun University of Technology Changchun 130012 China

To improve the surface wear resistance of the ceramic coating fabricated by micro-arc oxidation （MAO） on AZ91D magnesium alloy,ceramic coatings embedded with SiC nano-particles at different current frequency （500 Hz,700 Hz,and 900 Hz） were produced during the MAO *** morphology and phase composition of the coatings were investigated by scanning electron microscopy （SEM）,field emission scanning electron microscopy （FESEM）,and X-ray diffraction （XRD）.The surface roughness of the coatings was characterized by confocal laser scanning microscopy （CLSM）.Simultaneously,the tribological properties of the composite coatings were evaluated by using a universal materials tester （UMT）.The results shows that the wear resistance of the ceramic coatings with SiC nano-particles was improved significantly compared to the ceramic coatings without SiC ***,the composite coating formed at current frequency 900 Hz showed the better wear resistance than the others.

关键词： Magnesium alloy Micro-arc oxidation SiC nano-particles Wear resistance

Yb(OTf)_3-catalyzed synthesis of pyrroles under solvent-free conditions

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Chinese Chemical Letters 2009年第4期20卷 423-426页

作者： Bing Zuo Jiu Xi Chen Miao Chang Liu hua yue wu Wei Ke Su College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325027 China College of Pharmaceutical Sciences Zhejiang University of TechnologyZhejiang Key Laboratory of Pharmaceutical Engineering Hangzhou 310014 China

A Yb（OTf）3-catalyzed approach for the synthesis of pyrroles under solvent-free conditions was achieved, which could afford the desired products with yields ranged from moderate to excellent.

关键词： Ytterbium (III) triflate Pyrroles γ-Diketone Hydrazide Solvent-free conditions

Copper-catalyzed tandem reaction of 2-bromobenzyl bromides with 1,3-dicarbonyl compounds leading to 4H-chromenes

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Chinese Chemical Letters 2012年第10期23卷 1129-1132页

作者： Xin Ying Zhang Liang Liang Fang Nan Liu hua yue wu Xue Sen Fan School of Chemistry and Environmental Science Key Laboratory for Yellow River and Huai River Water Environment and Pollution ControlMinistry of EducationHenan Normal UniversityXinxiang 453007China College of Chemistry&Materials Engineering Wenzhou UniversityWenzhou 325027China

A Cu（I）-catalyzed one-pot tandem reaction of 2-bromobenzyl bromides with 1,3-dicarbonyl compounds leading to 4H- chromene derivatives has been developed. This new approach toward 4H-chromenes combines several reacti... 详细信息

关键词： One-pot tandem reaction 4H-Chromenes Copper catalysis

C(sp^3)–H bond functionalization of non-cyclic ethers by decarboxylative oxidative coupling with α,β-unsaturated carboxylic acids

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Science China Chemistry 2018年第2期61卷 180-183页

作者： Tong Zhang Xing-Wang Lan Yu-Qiang Zhou Nai-Xing Wang yue-hua wu Yalan Xing Jia-Long Wen Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beifing 100049 China Department of Chemistry William Paterson University of New Jersey New Jersey 07470 United States Beijing Key Laboratory of Lignocellulosic Chemistry Beijing Forestry University Beijing 100083 China

A copper-catalyzed decarboxylative oxidative coupling of α,β-unsaturated carboxylic acids with non-cyclic ethers is *** method provides a new approach for C(sp^3)–H bond functionalization of non-cyclic ethers. Mech... 详细信息

关键词： C(sp^3)–H bond functionalization non-cyclic ethers decarboxylative oxidative coupling α β-unsaturated carboxylic acids

An approach to the Paal–Knorr pyrroles synthesis in the presence of β-cyclodextrin in aqueous media

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Chinese Chemical Letters 2013年第9期24卷 793-796页

作者： Fu-Jun Duan Jin-Chang Ding Hong-Juan Deng Ding-Ben Chen Jiu-Xi Chen Miao-Chang Liu hua-yue wu College of Chemistry and Materials Engineering Wenzhou University Wenzhou Vocational and Technical College College of Pharmaceutical and Chemical Engineering Taizhou University

An efficient and facile method for the synthesis of N-substituted pyrroles in moderate to good yields by the Paal-Knorr reaction of β-diketones with amines in the presence of β-cyclodextrin in aqueous media has been developed. Moreover, this process tolerated diamines （e.g., para-, metaor orthophenylenediamine） to construct bis-pyrrole or mono-pyrrole derivates.β-Cyclodextrin can be recovered easily after the reactions and reused without evident loss in activity.

关键词： Pyrrole Paal-Knorr β-Cyclodextrin Water