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A Hydrogen bond mediated aglycone delivery (HAD) method was applied to the synthesis of α‐glucans, which are abundant in nature, but as targets represent a notable challenge to chemists. The synthesis of linear oligosaccharide sequences was accomplished in complete stereoselectivity in all glycosylations. The efficacy of HAD may diminish with the increased bulk of the glycosyl acceptor, and may be...
Als neue Abgangsgruppe für Glycosylierungen unter vielfältigen Bedingungen, darunter metallvermittelte und Alkylierungswege, kann eine anomere S‐Benzimidazolyl(SBiz)‐Einheit aktiviert werden. Beim Einsatz einer substituierten SBiz‐Einheit (X=Anisoyl, siehe Bild) gelingt der Aufbau von Oligosacchariden über Aktiv‐latent‐ und chemoselektive „Entsichert‐gesichert“‐Strategien.
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