Abstract
Abstract An efficient construction of the β-d-mannosidic, 2-Acetamido-2-deoxy-β-d-mannosidic, 2-deoxy-2-fluoro-β-d-mannosidic, and 2-deoxy-β-d-arabino-hexopyranosidic units from the same intermediate, 2-4-bis(O-trifluoromethylsulfonyl) derivative of β-d-galactoside, was achieved in good yields in a stepwise inversion at C-4 and C-2 by using cesium acetate, n-Bu4NN3, n-Bu4NF, and n-Bu4NBH4. A convenient and practical protection of β-d-mannoside to the straightforward synthesis of antennary oligosaccharides was also achieved by using cesium trifluoroacetate.
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