| Abstract
| - Two asymmetrically branched oligosaccharides, LewisX anddimeric LewisX, were assembled in one pot with high yieldsand exclusive regio- and stereoselectivities. p-Tolyl thioglycosides were utilized as the sole type of building blocks,thus simplifying the overall synthetic design. The reactivity-independent nature of the preactivation based method allowsmodular assembly of the dimeric LewisX octasaccharidewithout the need for tedious protective group manipulationto achieve exact anomeric reactivities.
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