1995
DOI: 10.1016/0040-4039(95)01604-x
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Stereocontrolled synthesis of the pentasaccharide core structure of asparagine-linked glycoprotein oligosaccharide based on a highly convergent strategy

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Cited by 52 publications
(16 citation statements)
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“…Particularly the use of the two arylidene groups led to excellent results (Scheme 32, transformation of 226 into 227). [298] The high yields and b selectivities in mannopyranoside synthesis offer strong support for the intramolecularity of these reactions. However, to the best of our knowledge, this claim has never been confirmed by competition experiments.…”
Section: Linkage Of the Glycosyl Donor And Acceptor Through A Functiomentioning
confidence: 97%
“…Particularly the use of the two arylidene groups led to excellent results (Scheme 32, transformation of 226 into 227). [298] The high yields and b selectivities in mannopyranoside synthesis offer strong support for the intramolecularity of these reactions. However, to the best of our knowledge, this claim has never been confirmed by competition experiments.…”
Section: Linkage Of the Glycosyl Donor And Acceptor Through A Functiomentioning
confidence: 97%
“…Als Y‐Gruppen wurden vor allem Isopropyliden, Propyliden, Ethyliden, 4‐Methoxybenzyliden, Naphthylmethyliden und Dimethylsilylen verwendet. Besonders die aufgeführten Arylidengruppen führen zu exzellenten Ergebnissen (Schema , Umwandlung von 226 in 227 ) 298. Die hohen Ausbeuten und β‐Selektivitäten der Mannopyranosidsynthese stützen die Intramolekularität dieser Reaktionen, nach unserem Kenntnisstand wurde dies jedoch nie durch Konkurrenzexperimente bestätigt.…”
Section: Intramolekulare Glycosidierungunclassified
“…[17][18][19][20][21][22][23][24][25][26][27] Tethering proceeded very efficiently using a slight excess of either donor or acceptor (typically 1.1-1.4 equiv relative to the other component) to give mixed acetals, which were either purified by size-exclusion chromatography or used crude in the next step. Activation with MeOTf, DTBMP, 4 Å in DCE or DCM gave the b-mannosides exclusively.…”
Section: Oxidative Tethering: Pmb and Modified Pmb Acetalsmentioning
confidence: 99%
“…A [2+3] block approach assembles this pentasaccharide in a single step ( Table 5, entry 6). 18 More efficiently, a [2+2] block approach (Table 5, entry 4) can be followed by glycosylation of mannose to give again the core pentasaccharide. 17 A great increase in efficiency in the glycosylation reaction was seen when O-4 and O-6 were constrained by a cyclic protecting group (compare, e.g., Table 5, entries 1,7,[12][13][14].…”
Section: Oxidative Tethering: Pmb and Modified Pmb Acetalsmentioning
confidence: 99%