Ghosh A, Kulkarni SS. Total Synthesis of the Repeating Unit of
Streptococcus pneumoniae Zwitterionic Polysaccharide Sp1.
J Org Chem 2021;
86:18292-18299. [PMID:
34860529 DOI:
10.1021/acs.joc.1c02409]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Reported herein is the total synthesis of the trisaccharide repeating unit of Streptococcus pneumoniae zwitterionic polysaccharide Sp1 containing a rare sugar, 2-acetamido-4-amino-2,4,6-trideoxy-d-galactose (AAT), and three consecutive 1,2-cis-glycosidic linkages. The total synthesis was completed via highly stereoselective glycosylations and late-stage oxidation as key steps involving a longest linear sequence of 21 steps with 4.4% overall yield.
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