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| - Synthesis of Branched Man5 Oligosaccharidesand an Unusual Stereochemical Observation
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| - Branched mannopentaoses were synthesized through tworoutes. While assembly from the nonreducing end to thereducing end was more convergent with fewer intermediatesteps, two diastereomers were obtained. On the other hand,synthesis from the reducing end to the nonreducing endyielded the mannopentaose with the desired stereochemistryas a single isomer. Our results suggest that it is stillchallenging to reliably predict stereochemical outcome of aglycosylation reaction. It is necessary to thoroughly characterize anomeric configurations of newly formed glycosidiclinkages in complex oligosaccharide synthesis.
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