Glycosylation Strategies in Block Syntheses

For the syntheses of the Lc -rclated compounds 208 and 211, a different strategy was adopted the precursor of the Le trisaccharide detenninant, in this case, was designed as a trisaccharide block donor 206 tliis would alternatively be converted into benz) 1 glycoside 207, precursor of the trisaccharide target stmcture 208, or be employed for the glycosylation of the acceptor 209, precursor of the reducing Gal... 

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