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Your search keyword '"Guang-Yun He"' showing total 5 results
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5 results on '"Guang-Yun He"'

2. Asymmetric Double Michael Reaction Catalyzed by Simple Primary Amine Catalysts: A Straightforward Approach to Construct Spirocyclic Oxindoles

Author

Li-Na Jia, Liang-Liang Wang, Guang-Yun He, Jian-Fei Bai, Lin Peng, Li-Xin Wang, Fang Tian, Xi-Ya Luo, and Xiao-Ying Xu

Subjects
Primary (chemistry), Chemistry, Organocatalysis, Yield (chemistry), Enantioselective synthesis, Michael reaction, Organic chemistry, Amine gas treating, General Chemistry, Optically active, Catalysis
Abstract

The enantioselective double Michael reaction of N-Boc-3-nonsubstitued oxindoles with dienones catalyzed by chiral monoimide protected cyclohexane-1,2-diamines was developed. A wide range of optically active spirocyclic oxindoles were obtained up to 98% yield and up to 89% ee.

Published
2012
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3. A New Ellagitannin from the Fruit ofPhyllanthus EmblicaL

Author

Fan Zhang, Jian-Min Yue, Chun-Bin Yang, Runhua Lu, Guang-Yun He, and Mei-Cai Deng

Subjects
chemistry.chemical_classification, Traditional medicine, Ellagitannin, Chemistry, Phyllanthus emblica, Chemical structure, General Chemistry
Abstract

A new ellagitannin along with eight known compounds has been isolated from the ethanol extract of the fruit of Phyllanthus emblica L. The chemical structure of the new compound was established as Phyllanthunin (1) by HR-ESI-MS, 1D and 2D NMR spectroscopic analysis.

Published
2007
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4. ChemInform Abstract: Asymmetric Michael Addition of α-Substituted Isocyanoacetates with Maleimides Catalyzed by Chiral Tertiary Amine Thiourea

Author

Fang Tian, Lin Peng, Xiao-Ying Xu, Jian-Fei Bai, Li-Xin Wang, Li-Na Jia, Liang-Liang Wang, Yun-Long Guo, and Guang-Yun He

Subjects
chemistry.chemical_compound, Tertiary amine, Thiourea, Chemistry, Succinimide derivatives, Michael reaction, General Medicine, Medicinal chemistry, Pyrrole derivatives, Catalysis, Stereocenter
Abstract

The title reaction affords succinimide derivatives having adjacent tertiary and quaternary stereocenters.

Published
2012
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5. ChemInform Abstract: Asymmetric Hydroxyamination of Oxindoles Catalyzed by Chiral Bifunctional Tertiary Amine Thiourea: Construction of 3-Amino-2-oxindoles with Quaternary Stereocenters

Author

Li-Na Jia, Li-Xin Wang, Guang-Yun He, Jian-Fei Bai, Lin Peng, Liang-Liang Wang, Jun Huang, Fang Tian, and Xiao-Ying Xu

Subjects
Nitrosobenzene, chemistry.chemical_compound, chemistry, Thiourea, Tertiary amine, General Medicine, Bifunctional, Combinatorial chemistry, Catalysis, Stereocenter
Abstract

A bifunctional piperidine—thiourea organocatalyst efficiently catalyzes the asymmetric hydroxyamination of oxindoles (I) with nitrosobenzene (II).

Published
2012
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