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De Novo Synthesis of a 2-Acetamido-4-amino-2,4,6-trideoxy-d-galactose (AAT) Building Block for the Preparation of a Bacteroides fragilis A1 Polysaccharide Fragment

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journal contribution
posted on 02.04.2010 by Rajan Pragani, Pierre Stallforth, Peter H. Seeberger
Zwitterionic polysaccharides (ZPSs) are potent T-cell activators that naturally occur on the cell surface of bacteria and show potential as immunostimulatory agents. An unusual, yet important component of many ZPSs is 2-acetamido-4-amino-2,4,6-trideoxy-d-galactose (AAT). AAT building block 2 was prepared via a de novo synthesis from N-Cbz-l-threonine 5. Furthermore, building block 2 was used to synthesize disaccharide 15 that constitutes a fragment of zwitterionic polysaccharide A1 (PS A1) found in Bacteroides fragilis.