Solid Phase Syntheses of Oligomannosides and of a Lactosamine Containing Milk Trisaccharide Using a Benzoate Linker
作者:Matthias Grathwohl、Richard R. Schmidt
DOI:10.1055/s-2001-18441
日期:——
Galactose and mannose building blocks 9 and 12 were designed for the solid phase synthesis of oligosaccharides (SPOS). Both compounds were employed after condensation with benzoic acid function containing resin 10 in SPOS of human milk trisaccharide 1 and oligomannosides 2-4 (α-(1Æ2)-linked hexamer). Thus, in this approach a special linker development was not required and with the temporary protective groups phenoxyacetyl (PA) and 9-fluorenylmethoxycarbonyl (Fmoc) as part of compounds 7-12 the strategy offers the additional advantage of having the anomeric centre at the reducing end available for further manipulations.
<i>O</i>-Glycosyl Trichloroacetimidates Bearing Fmoc as Temporary Hydroxy Protecting Group: A New Access to Solid-Phase Oligosaccharide Synthesis
作者:Fabien Roussel、Laurent Knerr、Matthias Grathwohl、Richard R. Schmidt
DOI:10.1021/ol006081l
日期:2000.10.1
O-glycosyl trichloroacetimidates bearing base sensitive Fmoc protectedhydroxygroups were efficiently prepared with CCl(3)CN using a catalytic amount of sodium hydride. The resulting glycosyl donors were engaged in glycosylation reactions both in solution and on solid support with a new ester-type linker with good results. In both approaches, Fmoc groups were afterward quantitatively cleaved using mild basic