Lewis pentasaccharide, active-latent glycosylations

SCHEME 5.21 Synthesis of the Lewis pentasaccharide by active-latent glycosylation. 

Cao, S, Gan, Z, Roy, R, Active-latent glycosylation strategy toward Lewis X pentasaccharide in a form suitable for neoglycoconjugate syntheses, Carbohydr. Res., 318, 75-81, 1999. 

In order to study further the usefulness of active-latent glycosylation strategy, we chose the synthesis of Lewis pentasaccharide which is widely distributed in many different human and animal tissues, and also in human milk oligosaccharides. 

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