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593 results on '"Shi Feng"'

4. ChemInform Abstract: Improved and Efficient Synthesis of Maxacalcitol

Author

Hegeng Wei, Guojun Zheng, Ya Ping Wang, Wen-sheng Xiang, Li-Fei Cui, Xiang-jing Wang, Ji Zhang, and Shi Feng

Subjects
Chemistry, General Medicine, Combinatorial chemistry
Abstract

A new synthetic route is presented for maxacalcitol (I), which can be used as an antihyperparathyroidism and antipsoriatric drug.

Published
2014

23. ChemInform Abstract: Highly Efficient and Catalyst-Free Synthesis of Substituted Thioureas in Water

Author

Jie-Ping Wan, Yuanjiang Pan, Shi-Feng Gan, and Cuirong Sun

Subjects
Green chemistry, chemistry.chemical_compound, Thiourea, chemistry, General Medicine, Combinatorial chemistry, Catalysis
Abstract

A highly efficient and catalyst-free method for the synthesis of substituted thiourea derivatives is presented. The synthesis is performed through the reaction of thiazolidine-2-thiones with various amines in water. A sound number of thioureas with both unsymmetrical and symmetrical architectures have been obtained in good to excellent yields.

Published
2011

24. ChemInform Abstract: Synthesis of 3-Methyl-2-cyclohexenones Catalyzed by Mercury(II) Salts and Their Microwave Assisted BiCl3 Catalyzed Aldol Condensations

Author

Chen Zhang, Bi-Song Wang, Shao-Qiao Zhang, Dong-Mei Cui, and Shi-Feng Chen

Subjects
Aldol reaction, Chemistry, chemistry.chemical_element, Organic chemistry, General Medicine, Microwave assisted, Catalysis, Mercury (element)
Abstract

Treatment of 1,6-heptadiynes with water in the presence of HgSO4and TfOH allows mild access to 3-methyl-2-cyclohexenones.

Published
2011

29. ChemInform Abstract: The Novel Reduction Systems: NaBH4-SbCl3 or NaBH4-BiCl3 for Conversion of Nitroarenes to Primary Amines

Author

Ping-Da Ren, Ting-Wei Dong, Shi-Hui Wu, and Shi-Feng Pan

Subjects
Primary (chemistry), fungi, education, food and beverages, chemistry.chemical_element, General Medicine, Chloride, humanities, Reduction (complexity), Bismuth chloride, chemistry.chemical_compound, Sodium borohydride, Antimony, chemistry, medicine, medicine.drug, Nuclear chemistry
Abstract

Nitroarenes can be conveniently reduced to primary amines in good to excellent yields by sodium borohydride in the presence of bismuth chloride or antimony chloride.

Published
2010

30. ChemInform Abstract: Selective Reduction of α,β-Unsaturated Esters with NaBH4- BiCl3 System

Author

Ping-Da Ren, Shi-Hui Wu, Shi-Feng Pan, and Ting-Wei Dong

Subjects
chemistry.chemical_classification, Reduction (complexity), Sodium borohydride, chemistry.chemical_compound, Bismuth chloride, chemistry, Double bond, High selectivity, chemistry.chemical_element, Selective reduction, General Medicine, Carbon, Nuclear chemistry
Abstract

Sodium borohydride - bismuth chloride system was applied for the selective reduction of carbon - carbon double bond of α,β - unsaturated esters with high selectivity.

Published
2010

31. ChemInform Abstract: Selective Reduction of Olefins with NaBH4-BiCl3 System

Author

Ping-Da Ren, Shi-Feng Pan, Shi-Hui Wu, and Ting-Wei Dong

Subjects
chemistry.chemical_classification, Inert, Reduction (complexity), Double bond, Chemistry, Polymer chemistry, Selective reduction, General Medicine, Conjugated system, Ring (chemistry)
Abstract

The carbon-carbon double bond that is conjugated to aromatic ring can be conveniently reduced by NaBH4-BiCl3 system in good yields. Aliphatic olefins are inert to this system. This system displays the selective reduction of aromatic olefins in the presence of aliphatic ones.

Published
2010

32. ChemInform Abstract: Catalytic Reduction of Nitroarenes to Azoxybenzenes with Sodium Borohydride in the Presence of Bismuth

Author

Ping-Da Ren, Ting-Wei Dong, Shi-Feng Pan, and Shi-Hui Wu

Subjects
inorganic chemicals, Azoxy, chemistry.chemical_element, Selective catalytic reduction, General Medicine, equipment and supplies, digestive system, Medicinal chemistry, humanities, digestive system diseases, Bismuth, Sodium borohydride, chemistry.chemical_compound, chemistry, Nitro
Abstract

Aromatic nitro compounds have been found to be selectively reduced to azoxy compounds in good yields by NaBH4 in the presence of bismuth powder.

Published
2010

50. ChemInform Abstract: Water Mediated Chemoselective Synthesis of 1,2-Disubstituted Benzimidazoles Using o-Phenylenediamine and the Extended Synthesis of Quinoxalines

Author

Shi-Feng Gan, Jian-Mei Wu, Yuanjiang Pan, and Jie-Ping Wan

Subjects
chemistry.chemical_classification, chemistry.chemical_compound, Chemistry, o-Phenylenediamine, medicine, General Medicine, Selectivity, Combinatorial chemistry, Chloride, Aldehyde, medicine.drug, Catalysis
Abstract

By applying water as the reaction medium, the one-pot synthesis of 1,2-disubstituted benzimidazoles has been achieved in excellent efficiency and selectivity at room temperature viatrimethylsilyl chloride promoted reaction of o-phenylenediamine with aldehyde. This green catalyst system has also been successfully extended to the synthesis of quinoxalines via the reaction of o-phenylenediamine with α-bromoketone. Water displayed a specific functionality in mediating the selectivity, and remarkable advantages over organic solvents in terms of yields as well as in the work up procedure of the reactions.

Published
2010

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