Abstract
Starting from D‐mannose, D‐galactose and D‐glucosamine hydrochloride, two disaccharide blocks were synthesized. Schmidt's inverse addition technique for trichloroacetimidate was utilized for the construction of a disaccharide with a β‐mannosidic linkage in good yield. The two disaccharides in the appropriate form were then allowed to react in the presence of N‐iodosuccinimide (NIS) and trifluoromethanesulfonic acid (TfOH) to give the tetrasaccharide derivative from which removal of protecting groups gave the desired tetrasaccharide in the form of its 2‐(trimethylsilyl)ethyl glycoside.
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