An anchoring group for solid-phase synthesis of oligosaccharides has been based on metathetic cleavage [102]. Although alkenyl units are not suitable for glyco-

sidation reactions in the presence of strong electrophilic activators, by use of the 4,5-dibromooctane (DBOD) anchor an iodide-mediated elimination reaction provides the active linker which can be cleaved under metathesis conditions [102] (Scheme 6.1.24).

BnO' BnO

BnO' BnO

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