Total synthesis of a densely functionalized Plesiomonas shigelloides serotype 51 aminoglycoside trisaccharide antigen
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Chunjun Qin Ben Schumann Xiaopeng Zou Claney L Pereira Guangzong Tian Jing Hu Peter H Seeberger Jian YinAbstract
Plesiomonas shigelloides, a pathogen responsible for frequent outbreaks of severe travelers' diarrhea, causes grave extraintestinal infections. Sepsis and meningitis due to P. shigelloides are associated with a high mortality rate as antibiotic resistance increases and vaccines are not available. Carbohydrate antigens expressed by pathogens are often structurally unique and are targets for developing vaccines and diagnostics. Here, we report a total synthesis of the highly functionalized trisaccharide repeating unit 2 from P. shigelloides serotype 51 from three monosaccharides. A judicious choice of building blocks and reaction conditions allowed for the four amino groups adorning the sugar rings to be installed with two N-acetyl (Ac) groups, rare acetamidino (Am), and d-3-hydroxybutyryl (Hb) groups. The strategy for the differentiation of amino groups in trisaccharide 2 will serve well for the syntheses of other complex glycans.
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Volume 140
Issue number 8
Pages 3120-3127
Available online
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Publisher website (DOI) 10.1021/jacs.8b00148
Europe PubMed Central 29377682
Pubmed 29377682
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