Ghosh B, Bhattacharjee N, Podilapu AR, Puri K, Kulkarni SS. Total Synthesis of the Repeating Units of
O-Specific Polysaccharide of
Pseudomonas chlororaphis subsp.
aureofaciens UCM B-306 via One-Pot Glycosylation.
Org Lett 2022;
24:3696-3701. [PMID:
35549295 DOI:
10.1021/acs.orglett.2c01318]
[Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein we report the first total syntheses of the trisaccharide-repeating units of Pseudomonas chlororaphis subsp. aureofaciens UCM B-306 via a one-pot assembly of the core trisaccharide structure. The rare-sugar-containing trisaccharide-repeating units are comprised of d-bacillosamine, 2-amino-2-deoxy-d-galacturonic acid or amide, and d-rhamnose units linked through three consecutive α-linkages. The total syntheses of two repeating units were completed starting from d-mannose via a longest-linear sequence of 27 steps in 5.8% and 4.4% overall yields, respectively.
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