Tworoutes for the synthesis of the amidine-linkedpseudo-disaccharide were developed. The amidine linkage was constructed by the intermolecular or intramolecular coupling between thioamide and amine in the presence of mercury (II) chloride. The former construction from d-arabinono-1,5-thiolactam and 6-amino-6-deoxy-d-glucoside gave the corresponding pseudo-disaccharide. The latter construction of