Stereoselective glycosylations using reactions with glycosyl donors

On the other hand, the reactions in dichloromethane (see Table 1 entries 9,13, and 14) were of poor stereoselectivity, although the overall yield was high. Furthermore, the formation of (1-glycoside increased with rise of reaction temperature (see Table 1, entry 14). The use of a KDN glycosyl donor 13 that is prepared by treatment [38] of 10 with thiophenol and BF3 etherate in dichloromethane, has also given results similar to those described for Neu5Ac [39]. 

Vankayalapati, H, Singh, G, Tranoy, I, Stereoselective O-glycosylation reactions using glycosyl donors with diphenylphosphinate and propane-1,3-diyl phosphate leaving groups. Tetrahedron Asymmetry, 12, 1373-1381, 2001. 

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