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Total syntheses of tumor-related antigens N3: probing the feasibility limits of the glycal assembly method.
The total syntheses of two octasaccharide antigens isolated from human milk, 1 and 2, and their corresponding allyl glycosides, 3 and 4, have been achieved by utilizing the glycal method. Convergent
Co2(CO)8-mediated endo mode cyclization of epoxy-alcohol: synthesis of 2-ethynyl-3-hydroxy-2-methyltetrahydropyran and 2-ethynyl-3-hydroxy-3-methyltetrahydropyran derivatives.
TLDR
The preferential endo mode cyclization over the exo one was observed in these experiments and the tetrahydropyran derivatives with the cobalt-complexed moiety were provided.