Three carbohydrate trifluoromethanesulfonates, of potential use in the alkylation of a 1-epivalienamine derivative to produce precursors of β-acarbose, have been prepared from the appropriate alcohols. The conversion of two of these trifluoromethanesulfonates into the primary amine, via the corresponding azide, is also reported.
Derivatives of 1,6-dideoxy-1,6-epithio- and 1,6-dideoxy-1,6-episeleno-β-D-glucopyranose have been shown to be effective glycosyl donors toward carbohydrate alcohols under the agency of N- iodosuccinimide/trifluoromethanesulfonic acid. Reduction of the intermediate disulfides and diselenides affords 6-deoxy-β-D-glucopyranosides. The synthesis of a range of such 6′-deoxy disaccharide derivatives is reported.
Various carbohydrate triflates have been treated with cyclohexylamine and a 1-epivalienamine derivative to give some of the desired secondary amine, but mainly the product of a competing elimination reaction, namely a mixture of alkenes. When the reactions were conducted in the presence of potassium carbonate, novel carbohydrate carbamates were formed.