O-Glycosyl Donors
3.4
579
⊡ Scheme 9
Armed-disarmed couplings based on torsional effects
⊡ Scheme 10
Sidetracking of NPGs in saccharide synthesis
reactivity of the substrate, as well as the protecting groups thereon. More recently, a milder
brominating system, the combination of CuBr 2 and LiBr in MeCN:THF (3:1), has been used
to brominate n-pentenyl glycosides containing O-benzyl, O-p-methoxybenzyl, N-phthaloyl,
and N-tetrachlorophthaloyl protecting groups [43].
3.4
579
⊡ Scheme 9
Armed-disarmed couplings based on torsional effects
⊡ Scheme 10
Sidetracking of NPGs in saccharide synthesis
reactivity of the substrate, as well as the protecting groups thereon. More recently, a milder
brominating system, the combination of CuBr 2 and LiBr in MeCN:THF (3:1), has been used
to brominate n-pentenyl glycosides containing O-benzyl, O-p-methoxybenzyl, N-phthaloyl,
and N-tetrachlorophthaloyl protecting groups [43].