Methyl 1,2-Orthoesters as Useful Glycosyl Donors in Glycosylation Reactions: A Comparison with n-Pent-4-enyl 1,2-Orthoesters
作者:Clara Uriel、Juan Ventura、Ana M. Gómez、J. Cristóbal López、Bert Fraser-Reid
DOI:10.1002/ejoc.201200089
日期:2012.6
Mannopyranose-derived methyl 1,2-orthoacetates (R = Me) and -benzoates (R = Ph) can function as glycosyldonors – upon BF3·Et2O activation in CH2Cl2 – in glycosylationreactions with monosaccharide acceptors to afford disaccharides in good yields. In the process, glycosylation is preferred to acid-catalyzed rearrangement leading to methyl mannopyranosides. Methyl1,2-orthoesters can be also used in regioselective