“…Several strategies for the synthesis of disaccharide nucleosides such as enzymatic O -glycosylation [ 20 , 21 ], chemical N -glycosylation [ 5 , 9 , 16 , 22 , 23 , 24 ] and chemical O -glycosylation [ 7 , 9 , 14 , 16 , 18 , 19 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ] have been reported to date. Chemical O -glycosylation is often useful for the large-scale synthesis of the desired disaccharide nucleosides in higher chemical yields compared to chemical N -glycosylation.…”