Efficient stereoselective synthesis of oligosaccharides of Streptococcus pneumoniae serotypes 6A and 6B containing multiple 1,2-cis glycosidic linkages
摘要:
The synthesis of the repeating units of pneumococcal polysaccharide serotypes 6A and 6B and derivatives thereof is described. Application of S-benzoxazolyl and S-thiazolinyl glycosides allowed rapid oligosaccharide assembly and provided complete stereoselectivity in challenging 1,2-cis glucosylations and galactosylations. The oligosaccharide assembly was accomplished in an efficient manner by selective activation of thioimidoyl leaving groups over thioglycosides. (c) 2007 Elsevier Ltd. All rights reserved.
<i>S</i>-Benzoxazolyl as a Stable Protecting Moiety and a Potent Anomeric Leaving Group in Oligosaccharide Synthesis
作者:Medha N. Kamat、Cristina De Meo、Alexei V. Demchenko
DOI:10.1021/jo071191s
日期:2007.8.31
As a part of a program for developing new versatile building blocks for stereoselective glycosylation and convergent oligosaccharide synthesis, we demonstrated that S-benzoxazolyl (SBox) glycosides are stable toward major protecting group manipulations employed in carbohydrate chemistry. On the other hand, they can be glycosidated under relatively mild reaction conditions to afford either 1,2-trans
Application of Glycosyl Thioimidates in Solid-Phase Oligosaccharide Synthesis
作者:M. Cristina Parlato、Medha N. Kamat、Haisheng Wang、Keith J. Stine、Alexei V. Demchenko
DOI:10.1021/jo701902f
日期:2008.3.1
S-benzoxazolyl (SBox) and S-thiazolinyl (STaz) glycosides, were investigated as glycosyl donors for solid-phaseoligosaccharidesynthesis. It was demonstrated that these derivatives are suitable for both glycosyl acceptor-bound and glycosyl donor-bound strategies, commonly employed in resin-supported oligosaccharidesynthesis.
<i>S</i>-Benzoxazolyl (SBox) Glycosides as Novel, Versatile Glycosyl Donors for Stereoselective 1,2-Cis Glycosylation
作者:Alexei V. Demchenko、Nelli N. Malysheva、Cristina De Meo
DOI:10.1021/ol0273452
日期:2003.2.1
[reaction: see text] Novel glycosyldonors, S-benzoxazolyl (SBox) glycosides, have been synthesized, tested toward various protecting group manipulations, and applied to the highlystereoselective 1,2-cis glycosylation. These compounds fulfill the requirements for a modern glycosyldonor such as accessibility, high stability toward protecting group manipulations, and mild activation conditions. It