Synthesis of tetrasaccharides as possible metastatic inhibitors

The synthesis is reported of the possible metastatic inhibitors — methyl β-d-galactopyranosyl-(1 → 4)-(2-acetamido-2-deoxy-α- d-glucopyranosyl)-(1 → 6)-β-d-galactopyranosyl-(1 → 4)- β-d-glucopyranoside (11) and methyl β-d- galactopyranosyl-(1 → 4)-(2-acetamido-2-deoxy-β-d- glucopyranosyl)-(1 → 6)-β-d-galactopyranosyl-(1 → 4)-β- d-glucopyranoside (14) — by procedures for regio- and stereo- selective coupling, reduction of azido groups, N-acetylation, and O-deacetylation.