Abstract
In this study ultrasound has been utilised for the Fischer glycosylation using free sugars and sulphuric acid immobilized on silica as catalyst. N-acetyl-D-glucosamine, N-acetyl-D-galactosamine, D-glucose, D-galactose, D-mannose, L-fucose, and lactose were glycosylated with propargyl alcohol or 2-azidoethanol affording the corresponding glycosides, with the production of the α-glycopyranoside as the dominant product. Remarkable acceleration of the glycosylation reactions (15 min-2 h compared to several hours) over reported procedures together with good yields were always observed.
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