betadex and melezitose

Inexpensive and readily available sulfonic acids, p-toluenesulfonic acid, and sulfuric acid are versatile and efficient catalysts for the peracetylation of a broad spectrum of carbohydrate substrates in good yield and in a practical time frame. Three appealing features in sulfonic acid-catalyzed acetylation of free sugars were explored including (1) suppression of furanosyl acetate formation for D-galactose and L-fucose; (2) high yielding chemoselective acetylation of sialic acid under appropriate conditions; and (3) peracetylation of amino sugars with different amino protecting functions. Simple one-pot two step acetylation-thioglycosidation methods for the expeditious synthesis of p-tolyl per-O-acetyl thioglycosides were also delineated.

Topics: Acetylation; Benzenesulfonates; beta-Cyclodextrins; Carbohydrates; Catalysis; Disaccharides; Magnetic Resonance Spectroscopy; Molecular Structure; Monosaccharides; Sulfonic Acids; Sulfuric Acids; Thioglycosides; Trisaccharides