Oligosaccharide synthesis armed-disarmed approach

SCHEME 33. Synthesis of cm—as-patterned oligosaccharide 170 via armed-disarmed approach. 

Smoot JT, Demchenko AV (2008) How the arming participating moieties can broaden the scope of chemoselective oligosaccharide synthesis by allowing the inverse armed-disarmed approach. J Org Chem 73 8838-8850... 

In the traditional approaches of oligosaccharide synthesis, the product of a glycosylation reaction had to be isolated and it required some chemical transformation(s) to make it suitable for the next glycosylation reaction. In some of the synthetic strategies described in Section 5.4, such as in the sequential glycosylations and in the armed-disarmed glycosylations, the product of one... 

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