Gaoqing Yuan
South China University of Technology
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Featured researches published by Gaoqing Yuan.
Chemical Communications | 2012
Gaoqing Yuan; Junhua Zheng; Xiaofang Gao; Xianwei Li; Liangbin Huang; Huoji Chen; Huanfeng Jiang
With atmospheric oxygen as the oxidant, a novel copper(I)-catalyzed synthesis of aryl methyl sulfones from aryl halides and widely available DMSO is described. The procedure tolerates aryl halides with various functional groups (such as methoxy, acetyl, chloro, fluoro and nitro groups), which could afford aryl methyl sulfones in moderate to high yields. The copper-catalyzed aerobic oxidation and the cleavage/formation of C-S bond are the key steps for this transformation.
Organic Letters | 2015
Xiaofang Gao; Xiaojun Pan; Jian Gao; Huanfeng Jiang; Gaoqing Yuan; Yingwei Li
A novel synthesis recipe for β-alkoxy methyl sulfides was developed via NH4I-mediated three-component oxysulfenylation reaction of styrenes with DMSO and alcohols. This method features simple operation and readily available starting materials, and it provides an alternative sulfenylating agent generated from DMSO for oxysulfenylation reactions.
Chemistry: A European Journal | 2010
Hua Cao Cao; Huanfeng Jiang; Gaoqing Yuan; Zhengwang Chen; Chaorong Qi; Huawen Huang
The formation of carbon-carbon and carbon-oxygen bonds continues to be an active and challenging field of chemical research. Nanoparticle catalysis has attracted considerable attention owing to its environmentally benign and high activity toward the reactions. Herein, we described a novel and effective nano-Cu(2)O-catalyzed one-pot domino process for the regioselective synthesis of α-carbonyl furans. Various electron-deficient alkynes with 2-yn-1-ols underwent this process smoothly in moderate to good yields in the presence of air at atmospheric pressure. It is especially noteworthy that a novel 2,4,5-trisubstituted 3-ynylfuran was formed in an extremely direct manner without tedious stepwise synthesis. Additionally, as all of the starting materials are readily available, this method may allow the synthesis of more complex α-carbonyl furans. An experiment to elucidate the mechanism suggested that the process involved a carbene intermediate.
Green Chemistry | 2015
Xiaojun Pan; Jian Gao; Juan Liu; Junyi Lai; Huanfeng Jiang; Gaoqing Yuan
An efficient I2-mediated approach for the synthesis of sulfonamides at room temperature using water as the solvent has been developed. This method for the synthesis of sulfonamides is quite convenient and environmentally friendly. In addition, the purification procedure of the desired products becomes very easy.
Organic Letters | 2011
Chaorong Qi; Huanfeng Jiang; Liangbin Huang; Gaoqing Yuan; Yanwei Ren
A novel carbon dioxide triggered and copper-catalyzed domino reaction for the efficient synthesis of highly substituted 3(2H)-furanones from readily available nitriles and propargylic alcohols has been developed. Carbon dioxide is a prerequisite for achieving the present catalytic transformation, and one of the oxygen atoms of carbon dioxide is incorporated into the 3(2H)-furanones. Nitriles not only act as the reaction solvent but also as the reactant; copper salts play dual roles of activating both the propargylic alcohols and nitriles.
RSC Advances | 2015
Jian Gao; Junyi Lai; Gaoqing Yuan
With water as the reaction medium, a green and efficient method has been developed for the synthesis of (E)-vinyl sulfones via I2-mediated decarboxylative cross-coupling reactions of sodium sulfinates with cinnamic acids. This synthetic route could effectively avoid the use of toxic organic solvents and transition metal catalysts, and the target products could be obtained with moderate to excellent yields under green and mild conditions.
RSC Advances | 2015
Xiaojun Pan; Qiao Liu; Liming Chang; Gaoqing Yuan
A simple and efficient method has been developed for the synthesis of symmetrical and unsymmetrical pyridines via NH4I-promoted cyclization of ketones with DMSO and NH4OAc. It was found that methyl ketones always gave selective formation of the unsymmetrical pyridine, while non-methyl ketones gave unpredictable results (symmetrical or non-symmetrical product only, or a mixture of the two). In addition, the deuterium-labeling experiments indicated that the C4 or C6 of the target product pyridine rings resulted from DMSO.
Organic Letters | 2016
Junyi Lai; Liming Chang; Gaoqing Yuan
A novel method toward synthesis of sulfonamides and β-arylsulfonyl enamines has been developed via I2/TBHP mediated C-N and C-H bond cleavage of tertiary amines, which features highly selective formation of two different target products depending on the reaction solvent. The experimental results reveal that H2O as the solvent could effectively achieve the C-N bond cleavage to produce sulfonamides due to H2O participating in the reaction process where H2O plays a dual role. Differing from H2O, organic solvents (such as dimethyl sulfoxide) could promote the C-H bond cleavage of tertiary amines to yield β-arylsulfonyl enamines.
RSC Advances | 2014
Gaoqing Yuan; Zechen Zhu; Xiaofang Gao; Huanfeng Jiang
An efficient electrochemical synthesis of poly-substituted oxazoles from readily available β-diketone derivatives and benzylamines is described. This electrochemical procedure does not need hazardous oxidants and transition metal catalysts as well as molecular I2 additives. Compared with the traditional thermo-chemical method, the present electrochemical method is greener and more efficient.
CrystEngComm | 2012
Gaoqing Yuan; Jinbao Zhu; Chuanhua Li; Xiaofang Gao
A modified electrochemical route was developed to deposit powdery ZnO nanocrystals. The approach is based on sodium citrate acting as the supporting electrolyte as well as a complex agent, Zn2+ ions resulting from the electro-oxidation of a Zn anode rather than zinc salts, and a H2O–EtOH mixed-solvent as the electrolytic medium. The supporting electrolytes, electrolytic media and additives play important roles in controlling the morphology of ZnO crystals. Under the synergetic action of the complex effect of citrate ions and solvent effect of H2O–EtOH (or electrostatic-adsorption of additives), ZnO nanoparticles could self-assemble to the nanocrystals with porous structures (such as nanospheres, nanoflowers and coral-like nanocrystals) without templates. The morphology of the ZnO crystals could evolve from nanospheres to nanorods or nanospindles by changing the electrolytic media or supporting electrolytes. A possible growth mechanism of the ZnO nanocrystals with different shapes was also discussed. In addition, further studies indicate that the prepared nanospheres (or nanoflowers) with hollow or porous structures have better photoluminescence performances than the nanorods.