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Nosocomial infections with the Gram-positive pathogen Clostridium difficile pose a major risk for hospitalized patients and result in significant costs to health care systems. Here, we present the chemical synthesis of a PS-II hapten of a cell wall polysaccharide of hypervirulent ribotype 027 of C. difficile. Mice were immunized with a conjugate consisting of the synthetic hexasaccharide and the diphtheria...
A divergent de novo synthesis of six differentially protected l-iduronic acid thioglycosides from a common advanced precursor is described. The key step of this synthetic sequence is the stereoselective elongation of dithioacetal protected C5-dialdehyde 11 via a highly diastereoselective MgBr 2 ·OEt 2 -mediated cyanation. Orthogonally protected l-iduronic acid building blocks obtained...
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