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Direct Synthesis of β-Mannopyranosides by the Sulfoxide Method. -The activation of a glycosyl donor via the sulfoxide group followed by addition of a glycosyl acceptor in CH2Cl2 results in the formation of mannopyranosides in high yield and high β:α-ratios. Reducing the bulk of the O-2 protecting g
Direct Chemical Synthesis of β-Mannopyranosides and Other Glycosides via Glycosyl Triflates. -New and efficient methods to prepare β-mannopyranosides like (III) and (VI) are reported. The use of a 4,6-O-benzylidene-protected mannose as well as non-participating protecting groups on O-2 and O-3 are