Mild but Efficient Methods for Stereoselective Glycosylation with Thioglycosides: Activation by [<i>N</i>-Phenylselenophthalimide-Mg(ClO<sub>4</sub>)<sub>2</sub>] and [PhIO-Mg(ClO<sub>4</sub>)<sub>2</sub>]
Combinations of N-phenylselenophthalimide (N-PSP) or iodosobenzene (PhIO) with Mg(ClO4)2 effectively promote glycosylation with thioglycosides under mild conditions. A 2,2,2-trichloroethoxycarbonyl group or trityl protecting group at the 6-position increased α-selectivity on glycosylation with 2-O-benzylated donors.
Trityl ethers in oligosaccharide synthesis: A novel strategy for the convergent assembly of oligosaccharides
作者:Geert-Jan Boons、Simeon Bowers、Diane M. Coe
DOI:10.1016/s0040-4039(97)00732-6
日期:1997.5
strategy in which a tritylated thioglycoside can act as a glycosyl donor and acceptor. In combination with previously reported chemoselective glycosylations, this feature enables highly convergent assembly of oligosaccharides