One-Pot Sequential Stereoselective Synthesis of Trisaccharide (Glc<i>β</i>1-6Glc<i>β</i>1-6Glc) by Promotion of Trityl Tetrakis(pentafluorophenyl)borate Catalyst
A one-pot synthesis of trisaccharides was successfully carried out by combination of two types of the trityl tetrakis(pentafluorophenyl)borate catalyzed stereoselective glycosylation reactions. Selective activation of a glycosyl phenyl carbonate in the presence of a thioglycoside allows two successive glycosyl coupling in one-pot manner to afford several protected trisaccharides, Glcβ1-6Glcβ1-6Glc, in good to high yields.