earticle

영어

The direct β-mannosylation with C-1 hydroxy sugars would provide a complimentary or efficient strategy for β-mannosylation, in that anomeric derivatization, isolation of the donor and activation and coupling should be carried out as separate steps. Herein we describe a novel β-mannosylation method. Reaction of C-1 hydroxy sugars with phthalic achydride in the presence of DBU at RT in CH2Cl2 and sequential addition of Tf2O, DTBMP and ROH without isolation of any intermediates to afford β-mannopyranoside. We have applied the successful one-pot dehydrative glycosylation method to the stereoselective β -mannosylation with C-1 hydroxy sugars to the synthesis of tetrasaccharide.