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A nonisosteric α-C-glycoside analogue of KRN7000 (α-1C-GalCer, 1) was reported to induce a selective type of cytokine release in human invariant natural killer cells in vitro. We report here a very concise synthetic route to 1 and its analogue 1'. The key steps include olefin cross-metathesis, Sharpless asymmetric epoxidation, and epoxide opening by NaN(3)/NH(4)Cl. Inversion of configuration at the amide-bearing carbon in the phytosphingosine backbone constructed by epoxide opening in our previous synthesis of 1 was verified, indicating that remote group participation is not involved during the epoxide-opening reaction.

journal of organic chemistry

Total Synthesis of α-1<i>C</i>-Galactosylceramide, an Immunostimulatory <i>C</i>-Glycosphingolipid, and Confirmation of the Stereochemistry in the First-Generation Synthesis

Total Synthesis of α-1C-Galactosylceramide, an Immunostimulatory C-Glycosphingolipid, and Confirmation of the Stereochemistry in the First-Generation Synthesis