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Your search keyword '"Feng, Enguang"' showing total 3 results
Start Over Author "Feng, Enguang" Topic amines
3 results on '"Feng, Enguang"'

1. Efficient dehydrative sialylation of C-4-aminated sialyl-hemiketal donors with Ph2SO/Tf2O.

Author

Ye D, Liu W, Zhang D, Feng E, Jiang H, and Liu H

Subjects
Acetylation, Pyrimidines chemistry, Stereoisomerism, Substrate Specificity, Amines chemistry, Benzene Derivatives chemistry, Mesylates chemistry, N-Acetylneuraminic Acid chemistry
Abstract

An efficient approach to the dehydrative sialylation of various substrates with C-4-aminated sialyl-hemiketal donors by using the reagent combination of diphenyl sulfoxide and triflic anhydride is reported. By using a C-4-hindered non-nucleophilic amine auxiliary, excellent yields and high alpha-stereoselectivities were obtained for coupling with a wide range of primary and secondary acceptors.

Published
2009
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2. Simultaneous 2-O-deacetylation and 4-amination of peracetylated Neu5Ac: application to the synthesis of (4→4)-piperazine derivatives linked sialic acid dimers

Author

Ye, Deju, Deng, Guanghui, Liu, Wenfeng, Zhou, Yu, Feng, Enguang, Jiang, Hualiang, and Liu, Hong

Subjects
*AMINES, *ORGANIC compounds, *OLIGOMERS, *SIALIC acids
Abstract

Abstract: A simultaneous stereoselective 2-O-deacetylation and 4-amination reaction of peracetylated Neu5Ac 1 has been established with cyclic secondary amines, such as 1-N-Boc-piperazine. Four C 2-symmetric and two asymmetric sialic acid dimers with (4→4)-piperazine derivatives linked were synthesized. They may serve as precursors of unnatural polysialic acids. [Copyright &y& Elsevier]

Published
2008
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3. Efficient Dehydrative Sialylation Of C-4-Aminated Sialyl-Hemiketal Donors with Ph2SO/Tf2O.

Author

Ye, Deju, Liu, Wenfeng, Zhang, Dengyou, Feng, Enguang, Jiang, Hualiang, and Liu, Hong

Subjects
*BIPHENYL compounds, *SIALIC acids, *NUCLEOPHILIC reactions, *SULFOXIDES, *ANHYDRIDES, *AMINES, *COUPLING agents (Chemistry), *CHEMICAL processes
Abstract

An efficient approach to the dehydrative sialylation of various substrates with C-4-aminated sialyl-hemiketal donors by using the reagent combination of diphenyl sulfoxide and triflic anhydride is reported. By using a C-4-hindered non-nucleophilic amine auxiliary, excellent yields and high a-stereoselectivities were obtained for coupling with a wide range of primary and secondary acceptors. [ABSTRACT FROM AUTHOR]

Published
2009
Full Text
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