Synthesis of ld-Hepp and KDO containing di- and tetrasaccharide derivatives of Neisseria meningitidis inner-core region via iodonium ion promoted glycosidations
作者:G.J.P.H. Boons、F.L. van Delft、P.A.M. van der Klein、G.A. van der Marel、J.H. van Boom
DOI:10.1016/s0040-4020(01)88191-6
日期:——
The synthesis of methyl(ethyl) 2-thio-KDO (i.e. 1, 2, 5, 7 and 10) and ethyl 1-thio-LD-Hepp (i.e. 26 and 43) derivatives will be described. The latter derivatives proved to be suitable donors in iodonium ion (NIS/IFOH) promoted glycosidation reactions. The usefulness of the glycosidation approach was illustrated by the successful conclusion of a spacer containing dimer L-alpha-D-Hepp-(1 --> 5)-alpha-KDO-2-O-(CH2)3NH2 (37) and tetramer beta-D-Galp-(1 --> 4)-beta-D-Glep-(1 --> 4)-L-alpha-D-Hepp-(1 -->5)-alpha-KDO-2-O-(CH2)3NH2 (47).
Synthesis of L-glycero-D-manno-heptopyranose-containing oligosaccharide structures found in lipopolysaccharides from Haemophilus influenzae
作者:Christian Bernlind、Stefan Oscarson
DOI:10.1016/s0008-6215(96)00275-3
日期:1997.1
Syntheses are described of the tetrasaccharide 2-(4-trifluoroacetamidophenyl)ethyl O-(beta-D-galactopyranosyl)-(1 --> 2)-O-(L-glycero-alpha-D-manno-heptopyranosyl)-(1 --> 2)-O-(L-glycero-alpha-D--manno-heptopyranosyl)-(1 --> 3)-L-glycero-alpha-D-mnnno-heptopyranoside (20) and the three trisaccharides 2-(4-trifluoroacetamidophenyl)ethyl O-(L-glycero-alpha-D-manno-heptopyranosyl)-(1 --> 2)-O-(L-glycero-alpha-D-manno-heptopyranosl)-(1 --> 3)-L-glycero-alpha-D-manno-heptopyranoside(17), 2-(4-trifluoroacetamidophenyl)ethyl O-(beta-D-glucopyranosyl)-(1 --> 4)-O-(beta-D-glucopyranosyl)-(1 --> 4)-L-glycero-alpha-D-manno-heptopyranoside (5), and 2-(4-trifluoroacetamidophenyl)ethyl O-(beta-D-galactopyranosyl)-(1 --> 4)-O-(beta-D-glucopyranosyl)-(1 --> 4)-L-glycero-alpha-D-manno-heptopyranoside (8), corresponding to structures found in the lipooligosaccharides of Haemophilus influenzae. (C) 1997 Elsevier Science Ltd.