Summary
Stereospecific 1,2-cis-glycosylation of 2-O-allyl protected glucosyl and mannosyl fluorides can be achieved via a sequence of allyl isomerization, N-iodosuccinimide mediated tethering, and intramolecular aglycon delivery (IAD). Fluoride is advantageous as an anomeric leaving group since extended reaction times can be employed to tether hindered aglycon alcohols without competitive anomeric activation. Tin(II) chloride mediated intramolecular glycosylation furnishes the desired α-glucosides and β-mannosides in an entirely stereoselective manner.
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It is not yet entirely clear exactly how 19(R = H) is formed, since this formally requires loss of I+ from the oxonium ion produced subsequently to intramolecular glycosylation
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© 2002 Springer-Verlag Wien
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Cumpstey, I., Fairbanks, A.J., Redgrave, A.J. (2002). Allyl Protecting Group Mediated Intramolecular Aglycon Delivery (IAD) of Glycosyl Fluorides. In: Schmid, W., Stütz, A.E. (eds) Timely Research Perspectives in Carbohydrate Chemistry. Springer, Vienna. https://doi.org/10.1007/978-3-7091-6130-2_6
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DOI: https://doi.org/10.1007/978-3-7091-6130-2_6
Publisher Name: Springer, Vienna
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