Condensation of benzyl 2,3,6-trideoxy-3-trifluoroacetamido-α-L-lyxo-hexopyranoside (5) with 4-O-acetyl-3-O-benzyl-2,6-dideoxy-α-L-lyxo-hexopyranosyl bromide (10) carried out under Koenigs-Knorr conditions gave12. Total deprotection of12and N-dimethylation at C-3 led to17while selective removal of the 4-O-acetyl group led to13, a synthetic intermediate for preparing24and33. Condensation of13with di-O-acetyl-L-fucal (18) or 4-O-acetyl-L-amicetal (25) in the presence ofN-iodosuccinimide followed by hydrogenolysis of the C-2-I bond gave20and27respectively. The trisaccharide24then was obtained from20by the same sequence of reactions used to convert12into17. After deacetylation and oxidation, this set of reactions also transformed27into33.