Volume 128, Issue 37 pp. 11383-11386
Zuschrift

Stereoselective β-Mannosylation by Neighboring-Group Participation

Hidde Elferink

Hidde Elferink

Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands

These authors contributed equally to this work.

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Rens A. Mensink

Rens A. Mensink

Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands

These authors contributed equally to this work.

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Dr. Paul B. White

Dr. Paul B. White

Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands

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Dr. Thomas J. Boltje

Corresponding Author

Dr. Thomas J. Boltje

Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands

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First published: 12 July 2016
Citations: 22

Abstract

The stereoselective synthesis of glycosidic bonds is the main challenge of oligosaccharide synthesis. Neighboring-group participation (NGP) of C2 acyl substituents can be used to provide 1,2-trans-glycosides. Recently, the application of NGP has been extended to the preparation of 1,2-cis-glycosides with the advent of C2 chiral auxiliaries. However, this methodology has been strictly limited to the synthesis of 1,2-cis-gluco-type sugars. Reported herein is the design and synthesis of novel mannosyl donors which provide 1,2-cis-mannosides by NGP of thioether auxiliaries. A key element in the design is the use of 1C4 locked mannuronic acid lactones to enable NGP of the C2 auxiliary. In addition to C2 participation a new mode of remote participation of the C4 benzyl group was identified and provides 1,2-cis-mannosides.

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