Development of Fully and Partially Protected Fucosyl Donors for Oligosaccharide Synthesis
作者:Robin Daly、Thomas McCabe、Eoin M. Scanlan
DOI:10.1021/jo302487c
日期:2013.2.1
and the silyl protecting groups could be removed in the presence of unsaturated bonds. The disilyl-protected donor was found to behave as an efficient, partiallyprotected glycosyl donor. The synthetic scope and limitations of these new donors is presented. Both donors were applied to the synthesis of a Lewis X trisaccharide displaying a propargyl group at the anomeric position. It was determined that
An unusual glycosylation product from a partially protected fucosyl donor under silver triflate activation conditions
作者:Robin Daly、Eoin M. Scanlan
DOI:10.1039/c3ob42073f
日期:——
Partially protected glycosyl donors are extremely useful reagents for oligosaccharide synthesis allowing more facile deprotection and enhanced activity due to lower steric restraints. A partially protected fucosyl donor containing tert-butyldimethylsilyl (TBDMS) protecting groups was activated under bromine–silver triflate conditions in the presence of primary alcohols and found to give difucoside products exclusively, in good yield with excellent diastereoselectivity. The dimerisation reaction appears to require a conformational relaxation of steric crowding, induced upon activation of the glycosyl donor. The scope and limitations of this unusual glycosylation methodology are reported.